<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a067ac-c977-74f1-89de-12962ebc96fb,g:abdae835-9277-4022-8771-090a29a4de3e-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.huntington.com/role/CoverPage" xlink:type="simple" xlink:href="hban-20260930.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/CoverPage" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_01a067ac-d2ea-776a-a61e-d9d70b21568c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntitiesTable_01a067ac-d2ea-776a-a61e-d9d70b21568c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7330-b658-72e3abc010c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_01a067ac-d2ea-776a-a61e-d9d70b21568c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7330-b658-72e3abc010c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7330-b658-72e3abc010c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7330-b658-72e3abc010c1" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7330-b658-72e3abc010c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7330-b658-72e3abc010c1" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesHPreferredStockMember_01a067ac-d2ea-74eb-9525-d9fb92ed1fb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesHPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:to="loc_us-gaap_SeriesHPreferredStockMember_01a067ac-d2ea-74eb-9525-d9fb92ed1fb0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesIPreferredStockMember_01a067ac-d2ea-706c-a60c-602b6348cdb8" xlink:href="hban-20260930.xsd#hban_SeriesIPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:to="loc_hban_SeriesIPreferredStockMember_01a067ac-d2ea-706c-a60c-602b6348cdb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesJPreferredStockMember_01a067ac-d2ea-7213-b2e5-69f5cb30efa6" xlink:href="hban-20260930.xsd#hban_SeriesJPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:to="loc_hban_SeriesJPreferredStockMember_01a067ac-d2ea-7213-b2e5-69f5cb30efa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-793c-80f4-6c6a2b1a1680" xlink:href="hban-20260930.xsd#hban_SeriesLPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:to="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-793c-80f4-6c6a2b1a1680" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7de0-b926-e2dd4ef7db53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-71c5-863f-885ccacb9e20" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7de0-b926-e2dd4ef7db53" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_01a067ac-d2ea-7d3f-be38-9ef07a102820" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentType_01a067ac-d2ea-7d3f-be38-9ef07a102820" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_01a067ac-d2ea-7880-a263-eb7e56e6f9d7" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentQuarterlyReport_01a067ac-d2ea-7880-a263-eb7e56e6f9d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_01a067ac-d2ea-7842-b370-21d0f6d70337" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentPeriodEndDate_01a067ac-d2ea-7842-b370-21d0f6d70337" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_01a067ac-d2ea-7fbc-a598-040346ab7a7e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentTransitionReport_01a067ac-d2ea-7fbc-a598-040346ab7a7e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_01a067ac-d2ea-7d31-a106-f5f5ce2dce0e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityRegistrantName_01a067ac-d2ea-7d31-a106-f5f5ce2dce0e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_01a067ac-d2ea-7a58-824c-d85998436860" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityIncorporationStateCountryCode_01a067ac-d2ea-7a58-824c-d85998436860" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_01a067ac-d2ea-7e2f-9596-1824d01a46a1" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityFileNumber_01a067ac-d2ea-7e2f-9596-1824d01a46a1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_01a067ac-d2ea-747a-a023-51d165bed472" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityTaxIdentificationNumber_01a067ac-d2ea-747a-a023-51d165bed472" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_01a067ac-d2ea-7447-8073-2e8ff25dd983" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityAddressAddressLine1_01a067ac-d2ea-7447-8073-2e8ff25dd983" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_01a067ac-d2ea-719b-a09b-df177ef3c041" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityAddressCityOrTown_01a067ac-d2ea-719b-a09b-df177ef3c041" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_01a067ac-d2ea-770c-8fe8-141281ffd5ef" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityAddressStateOrProvince_01a067ac-d2ea-770c-8fe8-141281ffd5ef" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_01a067ac-d2ea-7ea6-bfba-992919274541" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityAddressPostalZipCode_01a067ac-d2ea-7ea6-bfba-992919274541" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_01a067ac-d2ea-737a-b412-949aeaa89623" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_CityAreaCode_01a067ac-d2ea-737a-b412-949aeaa89623" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_01a067ac-d2ea-7e4e-9c4e-09ad90e85f01" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_LocalPhoneNumber_01a067ac-d2ea-7e4e-9c4e-09ad90e85f01" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_01a067ac-d2ea-78ae-b167-706800c7989a" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_Security12bTitle_01a067ac-d2ea-78ae-b167-706800c7989a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_01a067ac-d2ea-77ad-8471-08c9fa78339e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_TradingSymbol_01a067ac-d2ea-77ad-8471-08c9fa78339e" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_01a067ac-d2ea-73f8-bc45-9b28f7e438bd" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_SecurityExchangeName_01a067ac-d2ea-73f8-bc45-9b28f7e438bd" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_01a067ac-d2ea-7c19-b0e1-3d59092ce23b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityCurrentReportingStatus_01a067ac-d2ea-7c19-b0e1-3d59092ce23b" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_01a067ac-d2ea-7a1c-b892-e0436b47a612" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityInteractiveDataCurrent_01a067ac-d2ea-7a1c-b892-e0436b47a612" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_01a067ac-d2ea-71cf-82a2-da10449998a3" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityFilerCategory_01a067ac-d2ea-71cf-82a2-da10449998a3" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_01a067ac-d2ea-7324-bb32-3a7efc80744c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntitySmallBusiness_01a067ac-d2ea-7324-bb32-3a7efc80744c" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_01a067ac-d2ea-7f38-b090-7dd7831489f0" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityEmergingGrowthCompany_01a067ac-d2ea-7f38-b090-7dd7831489f0" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_01a067ac-d2ea-7dc3-a631-0d49801a55fa" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityShellCompany_01a067ac-d2ea-7dc3-a631-0d49801a55fa" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_01a067ac-d2ea-7a9b-9eb9-eb7933e13dae" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_01a067ac-d2ea-7a9b-9eb9-eb7933e13dae" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_01a067ac-d2ea-7afa-b0ae-82d338c32d07" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_EntityCentralIndexKey_01a067ac-d2ea-7afa-b0ae-82d338c32d07" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_01a067ac-d2ea-706f-840f-03b02571b5f4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_AmendmentFlag_01a067ac-d2ea-706f-840f-03b02571b5f4" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_01a067ac-d2ea-709e-aa34-dd190d38c5f5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentFiscalYearFocus_01a067ac-d2ea-709e-aa34-dd190d38c5f5" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_01a067ac-d2ea-7e4a-8f6d-fa009ff77888" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_DocumentFiscalPeriodFocus_01a067ac-d2ea-7e4a-8f6d-fa009ff77888" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_01a067ac-d2ea-727f-bbfa-da9e058661ed" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_01a067ac-d2ea-7a4e-83f8-59c66c2cf9aa" xlink:to="loc_dei_CurrentFiscalYearEndDate_01a067ac-d2ea-727f-bbfa-da9e058661ed" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" xlink:href="hban-20260930.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01a067ac-d2ea-72ff-b1e7-ed5d42676e95" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:to="loc_us-gaap_StatementTable_01a067ac-d2ea-72ff-b1e7-ed5d42676e95" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d2ea-714d-840e-c2f9685bb0ee" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a067ac-d2ea-72ff-b1e7-ed5d42676e95" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d2ea-714d-840e-c2f9685bb0ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d2ea-714d-840e-c2f9685bb0ee_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d2ea-714d-840e-c2f9685bb0ee" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d2ea-714d-840e-c2f9685bb0ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d2ea-7a75-848f-bbefee31bf07" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d2ea-714d-840e-c2f9685bb0ee" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d2ea-7a75-848f-bbefee31bf07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a067ac-d2ea-773f-8589-e1fe7cf4f75a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d2ea-7a75-848f-bbefee31bf07" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a067ac-d2ea-773f-8589-e1fe7cf4f75a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-7296-a31e-d11ef14d47cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-7296-a31e-d11ef14d47cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_01a067ac-d2ea-7a6f-a50c-82afc31f7a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:to="loc_us-gaap_OtherAssets_01a067ac-d2ea-7a6f-a50c-82afc31f7a4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a067ac-d2ea-7f78-afaa-89abe35864e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:to="loc_us-gaap_LongTermDebt_01a067ac-d2ea-7f78-afaa-89abe35864e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_01a067ac-d2ea-72d0-a896-1f81caa4329f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-785f-88fe-99c7dd09a461" xlink:to="loc_us-gaap_OtherLiabilities_01a067ac-d2ea-72d0-a896-1f81caa4329f" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ConsolidatedStatementsofIncomeUnaudited" xlink:type="simple" xlink:href="hban-20260930.xsd#ConsolidatedStatementsofIncomeUnaudited"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ConsolidatedStatementsofIncomeUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01a067ac-d2ea-7cb1-9522-4e1597d88ca2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_StatementTable_01a067ac-d2ea-7cb1-9522-4e1597d88ca2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d2ea-704a-9794-6675ab6c6669" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a067ac-d2ea-7cb1-9522-4e1597d88ca2" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d2ea-704a-9794-6675ab6c6669" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-704a-9794-6675ab6c6669_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d2ea-704a-9794-6675ab6c6669" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-704a-9794-6675ab6c6669_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d2ea-704a-9794-6675ab6c6669" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_PaymentsAndCashManagementRevenueMember_01a067ac-d2ea-794a-8bdf-bfbe68ed465a" xlink:href="hban-20260930.xsd#hban_PaymentsAndCashManagementRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_PaymentsAndCashManagementRevenueMember_01a067ac-d2ea-794a-8bdf-bfbe68ed465a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_WealthAndAssetManagementRevenueMember_01a067ac-d2ea-723d-8d33-7c0ce56e245b" xlink:href="hban-20260930.xsd#hban_WealthAndAssetManagementRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_WealthAndAssetManagementRevenueMember_01a067ac-d2ea-723d-8d33-7c0ce56e245b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CustomerDepositAndLoanFeesMember_01a067ac-d2ea-7dca-b89b-9525c349630c" xlink:href="hban-20260930.xsd#hban_CustomerDepositAndLoanFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_CustomerDepositAndLoanFeesMember_01a067ac-d2ea-7dca-b89b-9525c349630c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CapitalMarketFeesMember_01a067ac-d2ea-73d9-92e1-1df641b459f0" xlink:href="hban-20260930.xsd#hban_CapitalMarketFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_CapitalMarketFeesMember_01a067ac-d2ea-73d9-92e1-1df641b459f0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageBankingIncomeMember_01a067ac-d2ea-7d0f-bb95-fec4fcc6d59e" xlink:href="hban-20260930.xsd#hban_MortgageBankingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_MortgageBankingIncomeMember_01a067ac-d2ea-7d0f-bb95-fec4fcc6d59e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_GainsLossesOnSalesOfSecuritiesMember_01a067ac-d2ea-7368-ad29-88c4d1de1a28" xlink:href="hban-20260930.xsd#hban_GainsLossesOnSalesOfSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_GainsLossesOnSalesOfSecuritiesMember_01a067ac-d2ea-7368-ad29-88c4d1de1a28" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeMember_01a067ac-d2ea-7480-b675-aac2993b6003" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d2ea-770d-8694-055b4d13757c" xlink:to="loc_hban_OtherNoninterestIncomeMember_01a067ac-d2ea-7480-b675-aac2993b6003" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_01a067ac-d2ea-7e3b-ab02-107f6f65132e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_01a067ac-d2ea-7e3b-ab02-107f6f65132e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_01a067ac-d2ea-792a-8501-6c5bb3bff11a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_01a067ac-d2ea-7e3b-ab02-107f6f65132e" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_01a067ac-d2ea-792a-8501-6c5bb3bff11a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_01a067ac-d2ea-7a1b-8b44-9a0c1c35fe99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_01a067ac-d2ea-7a1b-8b44-9a0c1c35fe99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_01a067ac-d2ea-7ac9-810d-822114476ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeSecuritiesTaxable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_01a067ac-d2ea-7a1b-8b44-9a0c1c35fe99" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_01a067ac-d2ea-7ac9-810d-822114476ed6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_01a067ac-d2ea-7017-a2d1-71406cff7b39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeSecuritiesTaxExempt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeSecuritiesByTaxableStatusAbstract_01a067ac-d2ea-7a1b-8b44-9a0c1c35fe99" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_01a067ac-d2ea-7017-a2d1-71406cff7b39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_01a067ac-d2ea-75f3-947e-28327daa680d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestAndDividendIncomeSecuritiesHeldToMaturity_01a067ac-d2ea-75f3-947e-28327daa680d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InterestIncomeSecuritiesOperatingOtherTaxable_01a067ac-d2ea-7f0a-b745-d0cebf09da8c" xlink:href="hban-20260930.xsd#hban_InterestIncomeSecuritiesOperatingOtherTaxable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_hban_InterestIncomeSecuritiesOperatingOtherTaxable_01a067ac-d2ea-7f0a-b745-d0cebf09da8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInterestAndDividendIncome_01a067ac-d2ea-73f7-aacf-c8b03b214fc2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherInterestAndDividendIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_OtherInterestAndDividendIncome_01a067ac-d2ea-73f7-aacf-c8b03b214fc2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating_01a067ac-d2ea-79dc-bcb1-4d4cff79fccb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating_01a067ac-d2ea-79dc-bcb1-4d4cff79fccb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_01a067ac-d2ea-7770-b6d6-6f0de240b1cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:to="loc_us-gaap_InterestExpenseDeposits_01a067ac-d2ea-7770-b6d6-6f0de240b1cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseShortTermBorrowings_01a067ac-d2ea-7b2a-86b8-01c53d46f5cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:to="loc_us-gaap_InterestExpenseShortTermBorrowings_01a067ac-d2ea-7b2a-86b8-01c53d46f5cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOtherLongTermDebt_01a067ac-d2ea-7d7f-b4c8-9080e7195289" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:to="loc_us-gaap_InterestExpenseOtherLongTermDebt_01a067ac-d2ea-7d7f-b4c8-9080e7195289" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_01a067ac-d2ea-7862-b955-ba660a7bd276" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_01a067ac-d2ea-7034-9d89-902bb5964813" xlink:to="loc_us-gaap_InterestExpenseOperating_01a067ac-d2ea-7862-b955-ba660a7bd276" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_01a067ac-d2ea-7fd3-80ca-96eb8d7a75f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_01a067ac-d2ea-7fd3-80ca-96eb8d7a75f6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d2ea-7f38-96c0-0e23c466e6d9" xlink:href="hban-20260930.xsd#hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d2ea-7f38-96c0-0e23c466e6d9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_01a067ac-d2ea-789c-b14b-d8c9580f29c5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_01a067ac-d2ea-789c-b14b-d8c9580f29c5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_01a067ac-d2ea-7d99-a1c4-433b5cd3b9dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_01a067ac-d2ea-7d99-a1c4-433b5cd3b9dd" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_01a067ac-d2ea-78da-bfe6-3bcfd9b8c1ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_01a067ac-d2ea-7d99-a1c4-433b5cd3b9dd" xlink:to="loc_us-gaap_NoninterestIncome_01a067ac-d2ea-78da-bfe6-3bcfd9b8c1ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_01a067ac-d2ea-7849-9845-839f5d0da65e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_LaborAndRelatedExpense_01a067ac-d2ea-7849-9845-839f5d0da65e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_01a067ac-d2ea-7306-9b2c-501464546ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_01a067ac-d2ea-7306-9b2c-501464546ffa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentExpense_01a067ac-d2ea-7e0f-be73-6c132ffb1993" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquipmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_EquipmentExpense_01a067ac-d2ea-7e0f-be73-6c132ffb1993" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_01a067ac-d2ea-7641-ad03-f70767704d25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OccupancyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_OccupancyNet_01a067ac-d2ea-7641-ad03-f70767704d25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfessionalFees_01a067ac-d2ea-7d6e-a1be-63e7e276ead8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfessionalFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_ProfessionalFees_01a067ac-d2ea-7d6e-a1be-63e7e276ead8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketingExpense_01a067ac-d2ea-73a3-ade8-d6ba2f3a060d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MarketingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_MarketingExpense_01a067ac-d2ea-73a3-ade8-d6ba2f3a060d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_01a067ac-d2ea-7d26-b0a3-5dd44468f14f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_01a067ac-d2ea-7d26-b0a3-5dd44468f14f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_01a067ac-d2ea-7ebd-a888-9fb1be96d4ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d2ea-76dd-bb7b-8f2137e86ee3" xlink:to="loc_us-gaap_OtherNoninterestExpense_01a067ac-d2ea-7ebd-a888-9fb1be96d4ba" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_01a067ac-d2ea-7ba6-a428-3bc9637742cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NoninterestExpense_01a067ac-d2ea-7ba6-a428-3bc9637742cb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a067ac-d2ea-7ec4-a5ef-e1afc152a64d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a067ac-d2ea-7ec4-a5ef-e1afc152a64d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_01a067ac-d2ea-76f9-a7b8-8483b8287179" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_01a067ac-d2ea-76f9-a7b8-8483b8287179" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_01a067ac-d2ea-721e-bfc7-e5cd52524270" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_ProfitLoss_01a067ac-d2ea-721e-bfc7-e5cd52524270" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_01a067ac-d2ea-7d80-b03a-593fba943fbb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_01a067ac-d2ea-7d80-b03a-593fba943fbb" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_01a067ac-d2ea-7173-bd96-1a2590101976" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NetIncomeLoss_01a067ac-d2ea-7173-bd96-1a2590101976" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStock_01a067ac-d2ea-7316-a37f-1d213f4a4082" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_DividendsPreferredStock_01a067ac-d2ea-7316-a37f-1d213f4a4082" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_01a067ac-d2ea-7812-9f80-59f9be71bd28" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_01a067ac-d2ea-7812-9f80-59f9be71bd28" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_01a067ac-d2ea-707d-b580-47c710ad4e13" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_01a067ac-d2ea-707d-b580-47c710ad4e13" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_01a067ac-d2ea-731c-adb4-898fe1896f6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_01a067ac-d2ea-731c-adb4-898fe1896f6a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_01a067ac-d2ea-7bd6-a189-ac6af0d732e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7e37-8eb2-06f855d47998" xlink:to="loc_us-gaap_EarningsPerShareAbstract_01a067ac-d2ea-7bd6-a189-ac6af0d732e2" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_01a067ac-d2ea-7635-85f5-2a4581ce02fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_01a067ac-d2ea-7bd6-a189-ac6af0d732e2" xlink:to="loc_us-gaap_EarningsPerShareBasic_01a067ac-d2ea-7635-85f5-2a4581ce02fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_01a067ac-d2ea-7d38-83b1-f3271864c611" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_01a067ac-d2ea-7bd6-a189-ac6af0d732e2" xlink:to="loc_us-gaap_EarningsPerShareDiluted_01a067ac-d2ea-7d38-83b1-f3271864c611" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ConsolidatedStatementsofChangesinShareholdersEquityUnaudited" xlink:type="simple" xlink:href="hban-20260930.xsd#ConsolidatedStatementsofChangesinShareholdersEquityUnaudited"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ConsolidatedStatementsofChangesinShareholdersEquityUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01a067ac-d2ea-79a9-92ba-45eebe011c92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01a067ac-d2ea-7a30-9225-f29d95438a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-79a9-92ba-45eebe011c92" xlink:to="loc_us-gaap_StatementTable_01a067ac-d2ea-7a30-9225-f29d95438a2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d2ea-7e39-849d-a1b9834d040f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a067ac-d2ea-7a30-9225-f29d95438a2a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d2ea-7e39-849d-a1b9834d040f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7e39-849d-a1b9834d040f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d2ea-7e39-849d-a1b9834d040f" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7e39-849d-a1b9834d040f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7d97-9417-46fa9e940ccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d2ea-7e39-849d-a1b9834d040f" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7d97-9417-46fa9e940ccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7d97-9417-46fa9e940ccd" xlink:to="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_01a067ac-d2ea-7182-9146-c7aba1099f45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_PreferredStockMember_01a067ac-d2ea-7182-9146-c7aba1099f45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7e07-ae60-0944ddef48e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7e07-ae60-0944ddef48e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_01a067ac-d2ea-7399-923e-e32a3aecaad1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_01a067ac-d2ea-7399-923e-e32a3aecaad1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_01a067ac-d2ea-7e81-b01c-fe9825432616" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_TreasuryStockCommonMember_01a067ac-d2ea-7e81-b01c-fe9825432616" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d2ea-78d7-8c8f-47027110ce25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d2ea-78d7-8c8f-47027110ce25" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_01a067ac-d2ea-74f8-899b-ba73a93f8025" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ParentMember_01a067ac-d2ea-7c6c-8ee5-18732c20740d" xlink:to="loc_us-gaap_RetainedEarningsMember_01a067ac-d2ea-74f8-899b-ba73a93f8025" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_01a067ac-d2ea-767c-b6d1-a69e8f241073" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a067ac-d2ea-7d97-9417-46fa9e940ccd" xlink:to="loc_us-gaap_NoncontrollingInterestMember_01a067ac-d2ea-767c-b6d1-a69e8f241073" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7590-bd25-8d446c49b21d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a067ac-d2ea-7a30-9225-f29d95438a2a" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7590-bd25-8d446c49b21d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7590-bd25-8d446c49b21d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7590-bd25-8d446c49b21d" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7590-bd25-8d446c49b21d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7916-b368-f79a4adf6d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7590-bd25-8d446c49b21d" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7916-b368-f79a4adf6d2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7fba-a210-61551ea556e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7916-b368-f79a4adf6d2c" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7fba-a210-61551ea556e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-7301-b9bc-acbab044195a" xlink:href="hban-20260930.xsd#hban_SeriesLPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7916-b368-f79a4adf6d2c" xlink:to="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-7301-b9bc-acbab044195a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-79a9-92ba-45eebe011c92" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d2ea-7c91-aee1-e5d1f6f01e6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d2ea-7c91-aee1-e5d1f6f01e6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a067ac-d2ea-7bf4-991e-1df31f469564" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_01a067ac-d2ea-7bf4-991e-1df31f469564" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a067ac-d2ea-787e-adfe-21af3be1d485" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_TreasuryStockCommonShares_01a067ac-d2ea-787e-adfe-21af3be1d485" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_01a067ac-d2ea-71dc-8832-28ca270862b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_ProfitLoss_01a067ac-d2ea-71dc-8832-28ca270862b0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d2ea-7452-904c-5f03a0744728" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d2ea-7452-904c-5f03a0744728" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_01a0aa9e-1736-7d0b-9cf6-34b09831c5d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_01a0aa9e-1736-7d0b-9cf6-34b09831c5d4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-beca-9dc9d0635c31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-beca-9dc9d0635c31" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a067ac-d2ea-7ea5-8c73-bf9eba7dba97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-beca-9dc9d0635c31" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a067ac-d2ea-7ea5-8c73-bf9eba7dba97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_01a067ac-d2ea-7b62-be26-c07100b3c0a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-beca-9dc9d0635c31" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_01a067ac-d2ea-7b62-be26-c07100b3c0a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_01a067ac-d2ea-71f0-8ce2-b780600d7cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-beca-9dc9d0635c31" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities_01a067ac-d2ea-71f0-8ce2-b780600d7cf1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_01a067ac-d2ea-70c7-a083-404f6adcb64c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_01a067ac-d2ea-70c7-a083-404f6adcb64c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_01a067ac-d2ea-7ea5-81f4-70e73beb4a44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_01a067ac-d2ea-7ea5-81f4-70e73beb4a44" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCashAbstract_01a067ac-d2ea-7427-b823-3326d7ceb581" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCashAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_DividendsCashAbstract_01a067ac-d2ea-7427-b823-3326d7ceb581" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_01a067ac-d2ea-7e92-8e3b-1b3c819aba55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsCashAbstract_01a067ac-d2ea-7427-b823-3326d7ceb581" xlink:to="loc_us-gaap_DividendsCommonStockCash_01a067ac-d2ea-7e92-8e3b-1b3c819aba55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_01a067ac-d2ea-7118-905a-77f4f39338e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DividendsCashAbstract_01a067ac-d2ea-7427-b823-3326d7ceb581" xlink:to="loc_us-gaap_DividendsPreferredStockCash_01a067ac-d2ea-7118-905a-77f4f39338e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a067ac-d2ea-71ad-879f-4d55ff739362" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_01a067ac-d2ea-71ad-879f-4d55ff739362" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a067ac-d2ea-747d-bfa0-5c78c0d818bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_01a067ac-d2ea-747d-bfa0-5c78c0d818bc" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SharesIssuedValueOtherShareBasedPaymentArrangementAfterForfeiture_01a067ac-d2ea-7aca-9b2c-b5a7e1071e45" xlink:href="hban-20260930.xsd#hban_SharesIssuedValueOtherShareBasedPaymentArrangementAfterForfeiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_hban_SharesIssuedValueOtherShareBasedPaymentArrangementAfterForfeiture_01a067ac-d2ea-7aca-9b2c-b5a7e1071e45" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOther_01a067ac-d2ea-7227-b090-baeda707bf77" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockholdersEquityOther_01a067ac-d2ea-7227-b090-baeda707bf77" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityOtherShares_01a067ac-d2ea-745c-8be7-a282aba00061" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityOtherShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_01a067ac-d2ea-70cf-8f7a-2b0b581e9089" xlink:to="loc_us-gaap_StockholdersEquityOtherShares_01a067ac-d2ea-745c-8be7-a282aba00061" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d2ea-7abf-a0eb-89ad2e21cb5f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_01a067ac-d2ea-754b-8bb8-8b79d5926d2a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_01a067ac-d2ea-7382-8714-a5d2549a9b7f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TreasuryStockCommonShares"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="simple" xlink:href="hban-20260930.xsd#ConsolidatedStatementsofCashFlowsUnaudited"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ConsolidatedStatementsofCashFlowsUnaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_01a067ac-d2ea-7528-bbc6-ef5bc353983c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_StatementTable_01a067ac-d2ea-7528-bbc6-ef5bc353983c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-73b3-88ba-3cd718f83a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_01a067ac-d2ea-7528-bbc6-ef5bc353983c" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-73b3-88ba-3cd718f83a4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-73b3-88ba-3cd718f83a4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-73b3-88ba-3cd718f83a4f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-73b3-88ba-3cd718f83a4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-746f-839e-aaa9e89d73df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-73b3-88ba-3cd718f83a4f" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-746f-839e-aaa9e89d73df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-7294-9bef-fa9bc0c3e5ed" xlink:href="hban-20260930.xsd#hban_VeritexHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-746f-839e-aaa9e89d73df" xlink:to="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-7294-9bef-fa9bc0c3e5ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7fbc-97c8-41fa2fd5d3d2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7fbc-97c8-41fa2fd5d3d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_01a067ac-d2ea-7f33-8f7d-0f0a92433440" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7fbc-97c8-41fa2fd5d3d2" xlink:to="loc_us-gaap_ProfitLoss_01a067ac-d2ea-7f33-8f7d-0f0a92433440" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7fbc-97c8-41fa2fd5d3d2" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d2ea-72fa-85ec-016010d4b590" xlink:href="hban-20260930.xsd#hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d2ea-72fa-85ec-016010d4b590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAmortizationAndAccretionNet_01a067ac-d2ea-75f0-b587-39ee246167b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DepreciationAmortizationAndAccretionNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_DepreciationAmortizationAndAccretionNet_01a067ac-d2ea-75f0-b587-39ee246167b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_01a067ac-d2ea-7856-8ea3-be56855bd040" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_ShareBasedCompensation_01a067ac-d2ea-7856-8ea3-be56855bd040" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_01a067ac-d2ea-7167-8ebe-77851138626c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_01a067ac-d2ea-7167-8ebe-77851138626c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_01a067ac-d2ea-71cc-8c6f-66c6173b2176" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_01a067ac-d2ea-71cc-8c6f-66c6173b2176" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_01a10d26-b188-7326-8bee-24cf08a448b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_01a10d26-b188-7326-8bee-24cf08a448b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTradingSecurities_01a067ac-d2ea-7433-a792-6d9d9538189b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInTradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:to="loc_us-gaap_IncreaseDecreaseInTradingSecurities_01a067ac-d2ea-7433-a792-6d9d9538189b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_01a067ac-d2ea-7dba-a6fc-9586676134f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:to="loc_us-gaap_IncreaseDecreaseInLoansHeldForSale_01a067ac-d2ea-7dba-a6fc-9586676134f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AccruedIncomeAndOtherAssets_01a067ac-d2ea-7f26-9711-005065b20cf8" xlink:href="hban-20260930.xsd#hban_AccruedIncomeAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:to="loc_hban_AccruedIncomeAndOtherAssets_01a067ac-d2ea-7f26-9711-005065b20cf8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInNotesPayableCurrent_01a067ac-d2ea-7e37-ba92-dab58e88f75f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInNotesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:to="loc_us-gaap_IncreaseDecreaseInNotesPayableCurrent_01a067ac-d2ea-7e37-ba92-dab58e88f75f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_01a067ac-d2ea-7868-8042-338764b5d592" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_01a067ac-d2ea-7887-a8af-e9c0ebf5990e" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_01a067ac-d2ea-7868-8042-338764b5d592" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashIncomeExpense_01a067ac-d2ea-7031-9909-add11e29b482" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7284-a812-52c22499150f" xlink:to="loc_us-gaap_OtherNoncashIncomeExpense_01a067ac-d2ea-7031-9909-add11e29b482" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_01a067ac-d2ea-71e4-9cdf-a7a11f9e040d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_01a067ac-d2ea-7fbc-97c8-41fa2fd5d3d2" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_01a067ac-d2ea-71e4-9cdf-a7a11f9e040d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks_01a067ac-d2ea-7e57-8b47-c5e4e43c82c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks_01a067ac-d2ea-7e57-8b47-c5e4e43c82c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_01a067ac-d2ea-7bfc-bc62-0275fc48c81e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_01a067ac-d2ea-7bfc-bc62-0275fc48c81e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_01a067ac-d2ea-7499-a4a7-d52908724b82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities_01a067ac-d2ea-7499-a4a7-d52908724b82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments_01a067ac-d2ea-7b81-a9eb-954fce28858d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:to="loc_us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfOtherInvestments_01a067ac-d2ea-7b81-a9eb-954fce28858d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_01a067ac-d2ea-7e19-a392-95033626858f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:to="loc_us-gaap_ProceedsFromSaleOfAvailableForSaleSecuritiesDebt_01a067ac-d2ea-7e19-a392-95033626858f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ProceedsFromSaleOfOtherSecurities_01a067ac-d2ea-7a22-b378-9087ef2dddd8" xlink:href="hban-20260930.xsd#hban_ProceedsFromSaleOfOtherSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7648-aa2c-8348e19dcc8c" xlink:to="loc_hban_ProceedsFromSaleOfOtherSecurities_01a067ac-d2ea-7a22-b378-9087ef2dddd8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_01a067ac-d2ea-765e-8576-5d4df6844398" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_01a067ac-d2ea-765e-8576-5d4df6844398" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_01a067ac-d2ea-7027-ac20-1ef22eccddf0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireHeldToMaturitySecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsToAcquireHeldToMaturitySecurities_01a067ac-d2ea-7027-ac20-1ef22eccddf0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_PaymentsToAcquireOtherSecurities_01a067ac-d2ea-7c54-b2cb-652f8d38ae9d" xlink:href="hban-20260930.xsd#hban_PaymentsToAcquireOtherSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_hban_PaymentsToAcquireOtherSecurities_01a067ac-d2ea-7c54-b2cb-652f8d38ae9d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_01a067ac-d2ea-7a75-921c-e23e26283c22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromSaleOfLoansHeldForInvestment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_ProceedsFromSaleOfLoansHeldForInvestment_01a067ac-d2ea-7a75-921c-e23e26283c22" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancePrincipalLeasePayments_01a067ac-d2ea-7653-ae3f-9af51db0d7b9" xlink:href="hban-20260930.xsd#hban_FinancePrincipalLeasePayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_hban_FinancePrincipalLeasePayments_01a067ac-d2ea-7653-ae3f-9af51db0d7b9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherLoansAndLeases_01a067ac-d2ea-72ac-ad2f-998898db3753" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromOtherLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherLoansAndLeases_01a067ac-d2ea-72ac-ad2f-998898db3753" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_01a067ac-d2ea-7017-829d-312ffc023f15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_01a067ac-d2ea-7017-829d-312ffc023f15" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireFinanceReceivables_01a067ac-d2ea-704f-a395-48c6b88e804f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireFinanceReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsToAcquireFinanceReceivables_01a067ac-d2ea-704f-a395-48c6b88e804f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_PaymentsForProceedsFromInterestReceivablesAndOtherReceivablesActivity_01a067ac-d2ea-74df-9a78-499ebc83ae30" xlink:href="hban-20260930.xsd#hban_PaymentsForProceedsFromInterestReceivablesAndOtherReceivablesActivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_hban_PaymentsForProceedsFromInterestReceivablesAndOtherReceivablesActivity_01a067ac-d2ea-74df-9a78-499ebc83ae30" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAcquiredFromAcquisition_01a067ac-d2ea-7bcc-b0bd-267e3b950ceb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAcquiredFromAcquisition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_CashAcquiredFromAcquisition_01a067ac-d2ea-7bcc-b0bd-267e3b950ceb" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_01a067ac-d2ea-78f3-be1e-136a78db0a49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForProceedsFromOtherInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_PaymentsForProceedsFromOtherInvestingActivities_01a067ac-d2ea-78f3-be1e-136a78db0a49" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a067ac-d2ea-77dd-ab56-6921ee1b6d17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_01a067ac-d2ea-77af-b25e-c37f667fd79f" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_01a067ac-d2ea-77dd-ab56-6921ee1b6d17" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInDeposits_01a067ac-d2ea-79d2-ae18-8d627fd154cc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_IncreaseDecreaseInDeposits_01a067ac-d2ea-79d2-ae18-8d627fd154cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_01a067ac-d2ea-75a0-bd9b-1e35029b55e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromRepaymentsOfShortTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_ProceedsFromRepaymentsOfShortTermDebt_01a067ac-d2ea-75a0-bd9b-1e35029b55e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_01a067ac-d2ea-77e8-a581-da110ac615a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_01a067ac-d2ea-77e8-a581-da110ac615a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_01a067ac-d2ea-7d38-bfc1-2b82b43ce2a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_01a067ac-d2ea-7d38-bfc1-2b82b43ce2a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_01a067ac-d2ea-750b-ae6a-dfb57e5621cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_PaymentsOfDividendsPreferredStockAndPreferenceStock_01a067ac-d2ea-750b-ae6a-dfb57e5621cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_01a067ac-d2ea-79f1-9900-b8acd618ffbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_01a067ac-d2ea-79f1-9900-b8acd618ffbf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_01a067ac-d2ea-7770-9e4f-6da84b51d8f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfCommonStock_01a067ac-d2ea-7770-9e4f-6da84b51d8f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_01a10d27-20ee-75ad-8979-b18c36d4d990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock_01a10d27-20ee-75ad-8979-b18c36d4d990" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_01a067ac-d2ea-71c9-9f13-0a0d5c01c153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ProceedsFromPaymentsForOtherFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_ProceedsFromPaymentsForOtherFinancingActivities_01a067ac-d2ea-71c9-9f13-0a0d5c01c153" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_01a067ac-d2ea-70b5-890b-eb4404d36990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_01a067ac-d2ea-7987-a9a7-9fb0b415bf7d" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_01a067ac-d2ea-70b5-890b-eb4404d36990" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_01a067ac-d2ea-729b-aba1-db24658dd4ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_01a067ac-d2ea-729b-aba1-db24658dd4ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_01a067ac-d2ea-754e-8b4b-be2e6bfc3e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_01a067ac-d2ea-754e-8b4b-be2e6bfc3e0e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_01a067ac-d2ea-7636-9d8e-2984c1dc8e9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_01a067ac-d2ea-7334-b6ab-d3b2849cde9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_01a067ac-d2ea-7334-b6ab-d3b2849cde9b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_01a067ac-d2ea-7024-ba26-a2374660a642" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_01a067ac-d2ea-7334-b6ab-d3b2849cde9b" xlink:to="loc_us-gaap_InterestPaidNet_01a067ac-d2ea-7024-ba26-a2374660a642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_01a067ac-d2ea-7fff-af7f-acc69c0e6539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_01a067ac-d2ea-7334-b6ab-d3b2849cde9b" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_01a067ac-d2ea-7fff-af7f-acc69c0e6539" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_01a067ac-d2ea-702f-ae9f-4c3e3956be10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_01a067ac-d2ea-7ee9-a138-a01e2a649133" xlink:to="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_01a067ac-d2ea-702f-ae9f-4c3e3956be10" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1_01a067ac-d2ea-708d-9635-180e7d756d75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_01a067ac-d2ea-702f-ae9f-4c3e3956be10" xlink:to="loc_us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1_01a067ac-d2ea-708d-9635-180e7d756d75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1_01a067ac-d2ea-7061-8d30-42876bdd31ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_01a067ac-d2ea-702f-ae9f-4c3e3956be10" xlink:to="loc_us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1_01a067ac-d2ea-7061-8d30-42876bdd31ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherNoncashInvestingAndFinancingItemsAbstract_01a067ac-d2ea-702f-ae9f-4c3e3956be10" xlink:to="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1_01a067ac-d2ea-7daf-9bce-430da0e6137f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1_01a067ac-d2ea-7daf-9bce-430da0e6137f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1_01a067ac-d2ea-76e9-a017-8378255f9cb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionIntangibleAssetsAcquired1_01a067ac-d2ea-76e9-a017-8378255f9cb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1_01a067ac-d2ea-7e86-aba5-0b0020ff1b93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:to="loc_us-gaap_NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1_01a067ac-d2ea-7e86-aba5-0b0020ff1b93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationEquityIssued_01a067ac-d2ea-7f7e-bfb8-10e7540f308e" xlink:href="hban-20260930.xsd#hban_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationEquityIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:to="loc_hban_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationEquityIssued_01a067ac-d2ea-7f7e-bfb8-10e7540f308e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssued1_01a067ac-d2ea-7aff-a436-0a4e89b84e09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationsAbstract_01a067ac-d2ea-7743-a39e-e25308176ce7" xlink:to="loc_us-gaap_StockIssued1_01a067ac-d2ea-7aff-a436-0a4e89b84e09" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSNarrativeVeritexDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSNarrativeVeritexDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSNarrativeVeritexDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7993-b1b0-b64be0a22a66" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7993-b1b0-b64be0a22a66" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-78b4-91c9-897c7ffc0df6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7993-b1b0-b64be0a22a66" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-78b4-91c9-897c7ffc0df6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-78b4-91c9-897c7ffc0df6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-78b4-91c9-897c7ffc0df6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-78b4-91c9-897c7ffc0df6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7cf8-9ba6-1e44d3f9c341" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-78b4-91c9-897c7ffc0df6" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7cf8-9ba6-1e44d3f9c341" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-72dc-8ae7-65754c7a3609" xlink:href="hban-20260930.xsd#hban_VeritexHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7cf8-9ba6-1e44d3f9c341" xlink:to="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-72dc-8ae7-65754c7a3609" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7993-b1b0-b64be0a22a66" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7499-a359-2c3c7401b639" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7d51-a3b0-44b70dfa97f3" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7499-a359-2c3c7401b639" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexShareholdersCommonStockMember_01a067ac-d2ea-7992-83e3-1bae1eefd562" xlink:href="hban-20260930.xsd#hban_VeritexShareholdersCommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7499-a359-2c3c7401b639" xlink:to="loc_hban_VeritexShareholdersCommonStockMember_01a067ac-d2ea-7992-83e3-1bae1eefd562" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ConversionOfCertainVeritexEquityAwardsMember_01a067ac-d2ea-7c63-b348-c38dad6413e5" xlink:href="hban-20260930.xsd#hban_ConversionOfCertainVeritexEquityAwardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7499-a359-2c3c7401b639" xlink:to="loc_hban_ConversionOfCertainVeritexEquityAwardsMember_01a067ac-d2ea-7c63-b348-c38dad6413e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableRatio_01a067ac-d2ea-70e6-a72e-37c5353ac953" xlink:href="hban-20260930.xsd#hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:to="loc_hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableRatio_01a067ac-d2ea-70e6-a72e-37c5353ac953" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_01a067ac-d2ea-778c-9f4c-8a71c9e2b445" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_01a067ac-d2ea-778c-9f4c-8a71c9e2b445" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-70d9-9adb-f2b3639a7b30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-70d9-9adb-f2b3639a7b30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d2ea-712d-9dc3-49054286312e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7617-96ef-119d9845673a" xlink:to="loc_us-gaap_Goodwill_01a067ac-d2ea-712d-9dc3-49054286312e" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedVeritexDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedVeritexDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedVeritexDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7640-a414-b0cad99a5c90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7640-a414-b0cad99a5c90" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7217-b888-be5368a4bdaf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7640-a414-b0cad99a5c90" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7217-b888-be5368a4bdaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7217-b888-be5368a4bdaf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7217-b888-be5368a4bdaf" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7217-b888-be5368a4bdaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-792c-bf6e-6b470cfe9b6a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7217-b888-be5368a4bdaf" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-792c-bf6e-6b470cfe9b6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-725a-bf39-6cbd5085fda6" xlink:href="hban-20260930.xsd#hban_VeritexHoldingsInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-792c-bf6e-6b470cfe9b6a" xlink:to="loc_hban_VeritexHoldingsInc.Member_01a067ac-d2ea-725a-bf39-6cbd5085fda6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7eca-9ad7-da6fc7e47391" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7640-a414-b0cad99a5c90" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7eca-9ad7-da6fc7e47391" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7eca-9ad7-da6fc7e47391_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7eca-9ad7-da6fc7e47391" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7eca-9ad7-da6fc7e47391_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7f62-930a-1334443f5501" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7eca-9ad7-da6fc7e47391" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7f62-930a-1334443f5501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7259-bdfc-6e3416f70281" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7f62-930a-1334443f5501" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7259-bdfc-6e3416f70281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_01a067ac-d2ea-7244-b7a5-4ac7fc5cb152" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7f62-930a-1334443f5501" xlink:to="loc_us-gaap_StockCompensationPlanMember_01a067ac-d2ea-7244-b7a5-4ac7fc5cb152" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312f-70b9-7ba9-96eb-d0a302e40803" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312f-70b9-7ba9-96eb-d0a302e40803" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d2ea-7997-88f1-a6607a3934b9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312f-70b9-7ba9-96eb-d0a302e40803" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d2ea-7997-88f1-a6607a3934b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_01a067ac-d2ea-7bfd-a4ae-56c10bbe041c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312f-70b9-7ba9-96eb-d0a302e40803" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_01a067ac-d2ea-7bfd-a4ae-56c10bbe041c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-7478-962b-99f1ff21e750" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312f-70b9-7ba9-96eb-d0a302e40803" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-7478-962b-99f1ff21e750" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a067ac-d2ea-72e1-8a65-f9be99667c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a067ac-d2ea-72e1-8a65-f9be99667c2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks_01a067ac-d2ea-7842-aec5-8d104cf68af5" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks_01a067ac-d2ea-7842-aec5-8d104cf68af5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities_01a067ac-d2ea-7156-913b-25fa671594e5" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities_01a067ac-d2ea-7156-913b-25fa671594e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities_01a067ac-d2ea-7f3b-9db1-92eec23476e0" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities_01a067ac-d2ea-7f3b-9db1-92eec23476e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale_01a067ac-d2ea-7593-ba52-93392211da08" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale_01a067ac-d2ea-7593-ba52-93392211da08" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss_01a067ac-d2ea-723b-902a-19375df3a9f0" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss_01a067ac-d2ea-723b-902a-19375df3a9f0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss_01a067ac-d2ea-707f-8722-a15c24be0b70" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss_01a067ac-d2ea-707f-8722-a15c24be0b70" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss_01a067ac-d2ea-7e3b-96d6-e70a7bc38db1" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss_01a067ac-d2ea-7e3b-96d6-e70a7bc38db1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_01a067ac-d2ea-71e8-8635-ab696f20a4f2" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_01a067ac-d2ea-71e8-8635-ab696f20a4f2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a067ac-d2ea-70ff-acbe-dd79935e3f37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a067ac-d2ea-70ff-acbe-dd79935e3f37" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7c52-8e62-308d3da26419" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7c52-8e62-308d3da26419" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a067ac-d2ea-7cca-907f-8693ca9de990" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a067ac-d2ea-7cca-907f-8693ca9de990" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_01a067ac-d2ea-7728-8660-3d9138f7f54e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7e8f-939c-ac7d7448bf64" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_01a067ac-d2ea-7728-8660-3d9138f7f54e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_01a067ac-d2ea-7ab5-abba-4ee1da2a8809" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_01a067ac-d2ea-7ab5-abba-4ee1da2a8809" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7302-a70e-dfeec237f881" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7302-a70e-dfeec237f881" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a067ac-d2ea-71ad-94f6-ee102de65781" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a067ac-d2ea-71ad-94f6-ee102de65781" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a067ac-d2ea-7f2d-95e6-dd4213f616a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7bf5-9f50-045b8e0246c1" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a067ac-d2ea-7f2d-95e6-dd4213f616a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_01a067ac-d2ea-7f61-9dd2-d068d810d587" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_01a067ac-d2ea-7f61-9dd2-d068d810d587" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d2ea-749c-8995-ba78a14a9378" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ac4-94e9-390fa6e756fe" xlink:to="loc_us-gaap_Goodwill_01a067ac-d2ea-749c-8995-ba78a14a9378" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSNarrativeCadenceDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSNarrativeCadenceDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSNarrativeCadenceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-731d-91fc-923a9e6e388c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-731d-91fc-923a9e6e388c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-731d-91fc-923a9e6e388c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-731d-91fc-923a9e6e388c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-731d-91fc-923a9e6e388c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ea2-a5af-9ba08db028bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-731d-91fc-923a9e6e388c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ea2-a5af-9ba08db028bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d2ea-7c73-92e4-4085a2f8e7db" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ea2-a5af-9ba08db028bd" xlink:to="loc_hban_CadenceBankMember_01a067ac-d2ea-7c73-92e4-4085a2f8e7db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7b15-8575-a559664c0375" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7b15-8575-a559664c0375" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7b15-8575-a559664c0375_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7b15-8575-a559664c0375" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7b15-8575-a559664c0375_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7c73-b1c1-43c80f459555" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-7b15-8575-a559664c0375" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7c73-b1c1-43c80f459555" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_01a067ac-d2ea-7c7b-9deb-422a4e0fbc47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7c73-b1c1-43c80f459555" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_01a067ac-d2ea-7c7b-9deb-422a4e0fbc47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-7c57-857f-284c40fff86b" xlink:href="hban-20260930.xsd#hban_SeriesLPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7c73-b1c1-43c80f459555" xlink:to="loc_hban_SeriesLPreferredStockMember_01a067ac-d2ea-7c57-857f-284c40fff86b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7660-973a-3928c25b35be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-7c73-b1c1-43c80f459555" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7660-973a-3928c25b35be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01a067ac-d2ea-7673-871e-625af0526820" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:to="loc_dei_LegalEntityAxis_01a067ac-d2ea-7673-871e-625af0526820" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a067ac-d2ea-7673-871e-625af0526820_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_01a067ac-d2ea-7673-871e-625af0526820" xlink:to="loc_dei_EntityDomain_01a067ac-d2ea-7673-871e-625af0526820_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a067ac-d2ea-70a2-9cd1-f8ec5ec390b8" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_01a067ac-d2ea-7673-871e-625af0526820" xlink:to="loc_dei_EntityDomain_01a067ac-d2ea-70a2-9cd1-f8ec5ec390b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d2ea-72e2-9889-0f432c978e9d" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_01a067ac-d2ea-70a2-9cd1-f8ec5ec390b8" xlink:to="loc_hban_CadenceBankMember_01a067ac-d2ea-72e2-9889-0f432c978e9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d2ea-7d87-b839-85365945d96e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-775f-9270-066d39290aee" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d2ea-7d87-b839-85365945d96e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d2ea-7d87-b839-85365945d96e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d2ea-7d87-b839-85365945d96e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d2ea-7d87-b839-85365945d96e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d2ea-7579-b5c9-747fe991dbfa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d2ea-7d87-b839-85365945d96e" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d2ea-7579-b5c9-747fe991dbfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_01a067ac-d2ea-7daf-be4d-66b937bfa529" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d2ea-7579-b5c9-747fe991dbfa" xlink:to="loc_us-gaap_CoreDepositsMember_01a067ac-d2ea-7daf-be4d-66b937bfa529" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare_01a067ac-d2ea-79e1-80d1-1124186d6a23" xlink:href="hban-20260930.xsd#hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_hban_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuableEntitySharesIssuedPerAcquireeShare_01a067ac-d2ea-79e1-80d1-1124186d6a23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a067ac-d2ea-77bf-9455-1dec655a3fe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_01a067ac-d2ea-77bf-9455-1dec655a3fe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_01a067ac-d2ea-79ce-9ef5-f2b5c6dc22e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_01a067ac-d2ea-79ce-9ef5-f2b5c6dc22e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionRatio_01a067ac-d2ea-7704-8db3-53886309e89c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockConvertibleConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionRatio_01a067ac-d2ea-7704-8db3-53886309e89c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a067ac-d2ea-7a53-85b8-9e92bda4f266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_01a067ac-d2ea-7a53-85b8-9e92bda4f266" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-7764-acb1-28761ffdd9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-7764-acb1-28761ffdd9e4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d2ea-7644-be9b-e8b465b29ebc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_Goodwill_01a067ac-d2ea-7644-be9b-e8b465b29ebc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7aaa-ab41-b0fd2304c974" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7aaa-ab41-b0fd2304c974" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a067ac-d2ea-7304-812f-2865eee82523" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-77be-ac5b-bd2d597fdf97" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_01a067ac-d2ea-7304-812f-2865eee82523" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedCadenceDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedCadenceDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSAssetsAcquiredandLiabilitiesAssumedCadenceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-79e6-be05-8cb6bc11f267" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-79e6-be05-8cb6bc11f267" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7c83-aade-a7fbeb49717c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-79e6-be05-8cb6bc11f267" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7c83-aade-a7fbeb49717c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7c83-aade-a7fbeb49717c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7c83-aade-a7fbeb49717c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7c83-aade-a7fbeb49717c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-78df-afa3-3657a7649149" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7c83-aade-a7fbeb49717c" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-78df-afa3-3657a7649149" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d2ea-7d90-a07b-191a57e1a9c2" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-78df-afa3-3657a7649149" xlink:to="loc_hban_CadenceBankMember_01a067ac-d2ea-7d90-a07b-191a57e1a9c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7b64-812b-c0c226fe502f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-79e6-be05-8cb6bc11f267" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7b64-812b-c0c226fe502f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7b64-812b-c0c226fe502f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7b64-812b-c0c226fe502f" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7b64-812b-c0c226fe502f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7e2d-9ba0-9d909abcefe7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_01a067ac-d2ea-7b64-812b-c0c226fe502f" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7e2d-9ba0-9d909abcefe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7e01-b0e2-713b91fc62fa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7e2d-9ba0-9d909abcefe7" xlink:to="loc_us-gaap_CommonStockMember_01a067ac-d2ea-7e01-b0e2-713b91fc62fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockCompensationPlanMember_01a067ac-d2ea-7b17-888d-c137356ebf68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockCompensationPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7e2d-9ba0-9d909abcefe7" xlink:to="loc_us-gaap_StockCompensationPlanMember_01a067ac-d2ea-7b17-888d-c137356ebf68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_01a067ac-d2ea-7548-9d52-1af9c833682a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_01a067ac-d2ea-7e2d-9ba0-9d909abcefe7" xlink:to="loc_us-gaap_PreferredStockMember_01a067ac-d2ea-7548-9d52-1af9c833682a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312e-6eea-7419-8c2c-ed65a5999923" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312e-6eea-7419-8c2c-ed65a5999923" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d2ea-742e-aa7e-cc2833c8eafd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312e-6eea-7419-8c2c-ed65a5999923" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_01a067ac-d2ea-742e-aa7e-cc2833c8eafd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-77ba-a755-c05ef7e7b25e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_01a1312e-6eea-7419-8c2c-ed65a5999923" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_01a067ac-d2ea-77ba-a755-c05ef7e7b25e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a067ac-d2ea-7029-8485-5341201127ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_01a067ac-d2ea-7029-8485-5341201127ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks_01a067ac-d2ea-7e3c-b6d1-58e2aa2c2f73" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedInterestBearingDepositsInBanks_01a067ac-d2ea-7e3c-b6d1-58e2aa2c2f73" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities_01a067ac-d2ea-79ff-bd86-f06a479ed1b4" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAvailableForSaleSecurities_01a067ac-d2ea-79ff-bd86-f06a479ed1b4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities_01a067ac-d2ea-773b-bf97-3e2bb99b85fe" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherSecurities_01a067ac-d2ea-773b-bf97-3e2bb99b85fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale_01a067ac-d2ea-78da-8b65-da3e11d8ca4c" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansHeldForSale_01a067ac-d2ea-78da-8b65-da3e11d8ca4c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss_01a067ac-d2ea-7509-a0b9-f09caadaa0bd" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableBeforeAllowanceForCreditLoss_01a067ac-d2ea-7509-a0b9-f09caadaa0bd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss_01a067ac-d2ea-7453-bdc5-64d10e56f2b4" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAllowanceForCreditLoss_01a067ac-d2ea-7453-bdc5-64d10e56f2b4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss_01a067ac-d2ea-7a77-b261-b089305bff0b" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLoansAndLeasesReceivableAfterAllowanceForCreditLoss_01a067ac-d2ea-7a77-b261-b089305bff0b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_01a067ac-d2ea-7b94-b56c-c947b26fd28d" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBankOwnedLifeInsurance_01a067ac-d2ea-7b94-b56c-c947b26fd28d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a067ac-d2ea-71bb-8871-4ab89a2d752b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_01a067ac-d2ea-71bb-8871-4ab89a2d752b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7894-9628-87f077d7d6fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d2ea-7894-9628-87f077d7d6fe" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a067ac-d2ea-7652-a3a1-95f560137c97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_01a067ac-d2ea-7652-a3a1-95f560137c97" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_01a067ac-d2ea-75bb-8632-66b2e52c775c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_01a067ac-d2ea-7b30-a7f2-e4db114d248a" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets_01a067ac-d2ea-75bb-8632-66b2e52c775c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_01a067ac-d2ea-723f-b8f1-a9f91d40070e" xlink:href="hban-20260930.xsd#hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:to="loc_hban_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_01a067ac-d2ea-723f-b8f1-a9f91d40070e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7768-b6c1-98f3713874a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7768-b6c1-98f3713874a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7259-9fc2-c458e6ab7e23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt_01a067ac-d2ea-7259-9fc2-c458e6ab7e23" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a067ac-d2ea-7655-8b0e-ad3fdec5cfff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_01a067ac-d2ea-7655-8b0e-ad3fdec5cfff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a067ac-d2ea-7dd3-b939-f89c5362780f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_01a067ac-d2ea-7e07-9285-80856be4e9a5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_01a067ac-d2ea-7dd3-b939-f89c5362780f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_01a067ac-d2ea-7ebb-a702-82bfe2556893" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet_01a067ac-d2ea-7ebb-a702-82bfe2556893" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d2ea-78bf-8435-ab939a6ccd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7ead-8708-bca0a5c479d5" xlink:to="loc_us-gaap_Goodwill_01a067ac-d2ea-78bf-8435-ab939a6ccd4e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSPCDLoansDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSPCDLoansDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSPCDLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7ab1-bbf1-ee2a15c7e9a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7ab1-bbf1-ee2a15c7e9a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7861-82ed-073c5de31a90" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7ab1-bbf1-ee2a15c7e9a2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7861-82ed-073c5de31a90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7861-82ed-073c5de31a90_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7861-82ed-073c5de31a90" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7861-82ed-073c5de31a90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-706d-b2d2-1032ac87dbb7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7861-82ed-073c5de31a90" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-706d-b2d2-1032ac87dbb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d2ea-72be-87de-ac724ff985bf" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-706d-b2d2-1032ac87dbb7" xlink:to="loc_hban_CadenceBankMember_01a067ac-d2ea-72be-87de-ac724ff985bf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_01a067ac-d2ea-7d94-b1d8-167136bedbe5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-7ab1-bbf1-ee2a15c7e9a2" xlink:to="loc_us-gaap_CreditLossStatusAxis_01a067ac-d2ea-7d94-b1d8-167136bedbe5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7d94-b1d8-167136bedbe5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_01a067ac-d2ea-7d94-b1d8-167136bedbe5" xlink:to="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7d94-b1d8-167136bedbe5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7be4-bd95-a32915efc449" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_01a067ac-d2ea-7d94-b1d8-167136bedbe5" xlink:to="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7be4-bd95-a32915efc449" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancialAssetAcquiredWithoutPurchasedCreditDeteriorationForPurchasedSeasonedLoanMember_01a067ac-d2ea-746d-8765-c46d8de6af23" xlink:href="hban-20260930.xsd#hban_FinancialAssetAcquiredWithoutPurchasedCreditDeteriorationForPurchasedSeasonedLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7be4-bd95-a32915efc449" xlink:to="loc_hban_FinancialAssetAcquiredWithoutPurchasedCreditDeteriorationForPurchasedSeasonedLoanMember_01a067ac-d2ea-746d-8765-c46d8de6af23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_01a067ac-d2ea-7d03-a64f-2ec60a71faee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_01a067ac-d2ea-7be4-bd95-a32915efc449" xlink:to="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_01a067ac-d2ea-7d03-a64f-2ec60a71faee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableBeforeAllowanceForCreditLossAndFee_01a067ac-d2ea-7ec0-a370-45383a51a9a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableBeforeAllowanceForCreditLossAndFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_FinancingReceivableBeforeAllowanceForCreditLossAndFee_01a067ac-d2ea-7ec0-a370-45383a51a9a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableUnamortizedPurchasePremiumDiscount_01a067ac-d2ea-769a-9e37-e87df228fecc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableUnamortizedPurchasePremiumDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_FinancingReceivableUnamortizedPurchasePremiumDiscount_01a067ac-d2ea-769a-9e37-e87df228fecc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableGross_01a067ac-d2ea-788d-bd0f-2fa253bc8df0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_NotesReceivableGross_01a067ac-d2ea-788d-bd0f-2fa253bc8df0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_01a067ac-d2ea-75c7-bd8f-e570c1d5e91f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLosses_01a067ac-d2ea-75c7-bd8f-e570c1d5e91f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_01a067ac-d2ea-729b-bc29-01dc06b3e027" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-7b02-9b14-4f1f4ab33ec7" xlink:to="loc_us-gaap_NotesReceivableNet_01a067ac-d2ea-729b-bc29-01dc06b3e027" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSProFormaDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSProFormaDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSProFormaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexAndCadenceMember_01a067ac-d2ea-74c9-badb-696f17b87405" xlink:href="hban-20260930.xsd#hban_VeritexAndCadenceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:to="loc_hban_VeritexAndCadenceMember_01a067ac-d2ea-74c9-badb-696f17b87405" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d2ea-7f9f-97c3-5abda03bc45f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d2ea-7f9f-97c3-5abda03bc45f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a067ac-d2ea-7392-9e5c-2c0fad7bbac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a067ac-d2ea-7392-9e5c-2c0fad7bbac6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a067ac-d2ea-79b8-b227-3786f9301a59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a067ac-d2ea-79b8-b227-3786f9301a59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_01a067ac-d2ea-7bf1-b22d-73b93e85bb46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_01a067ac-d2ea-7bf1-b22d-73b93e85bb46" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BUSINESSCOMBINATIONSProFormaDetails_1" xlink:type="simple" xlink:href="hban-20260930.xsd#BUSINESSCOMBINATIONSProFormaDetails_1"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BUSINESSCOMBINATIONSProFormaDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_01a067ac-d2ea-74dd-b68d-dd698a81bf3a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d2ea-7ecf-a9bd-5ec7d6644f78" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_VeritexAndCadenceMember_01a067ac-d2ea-74c9-badb-696f17b87405" xlink:href="hban-20260930.xsd#hban_VeritexAndCadenceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d2ea-7f8b-a37e-1b0ab20b7d50" xlink:to="loc_hban_VeritexAndCadenceMember_01a067ac-d2ea-74c9-badb-696f17b87405" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a067ac-d2ea-7392-9e5c-2c0fad7bbac6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_01a067ac-d2ea-7392-9e5c-2c0fad7bbac6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a067ac-d2ea-79b8-b227-3786f9301a59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_01a067ac-d2ea-79b8-b227-3786f9301a59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_01a067ac-d2ea-7bf1-b22d-73b93e85bb46" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_01a067ac-d2ea-761c-bc15-415a0d303a1d" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss_01a067ac-d2ea-7bf1-b22d-73b93e85bb46" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESScheduleofAmortizedCostFairValueandGrossUnrealizedGainsandLossesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#INVESTMENTANDOTHERSECURITIESScheduleofAmortizedCostFairValueandGrossUnrealizedGainsandLossesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESScheduleofAmortizedCostFairValueandGrossUnrealizedGainsandLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:href="hban-20260930.xsd#hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ScheduleofInvestmentSecuritiesandOtherSecuritiesTable_01a067ac-d2ea-77ca-b2fb-0cddd54b3908" xlink:href="hban-20260930.xsd#hban_ScheduleofInvestmentSecuritiesandOtherSecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_hban_ScheduleofInvestmentSecuritiesandOtherSecuritiesTable_01a067ac-d2ea-77ca-b2fb-0cddd54b3908" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-728c-98eb-b7e51fea55e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hban_ScheduleofInvestmentSecuritiesandOtherSecuritiesTable_01a067ac-d2ea-77ca-b2fb-0cddd54b3908" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-728c-98eb-b7e51fea55e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-728c-98eb-b7e51fea55e9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-728c-98eb-b7e51fea55e9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-728c-98eb-b7e51fea55e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-728c-98eb-b7e51fea55e9" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d2ea-705d-8ad7-5ed1fd5d0a00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d2ea-705d-8ad7-5ed1fd5d0a00" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d2ea-7100-8825-2fb9eca7c331" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d2ea-7100-8825-2fb9eca7c331" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_01a067ac-d2ea-709d-8689-7ca662a632ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedMortgageObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_01a067ac-d2ea-709d-8689-7ca662a632ff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d2ea-79fe-9f4f-754cb735a9f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d2ea-79fe-9f4f-754cb735a9f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherFederalAgenciesMember_01a067ac-d2ea-73ca-bccd-5f2416eec4eb" xlink:href="hban-20260930.xsd#hban_OtherFederalAgenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USTreasuryAndGovernmentMember_01a067ac-d2ea-7550-b06e-2bfcd7725cf5" xlink:to="loc_hban_OtherFederalAgenciesMember_01a067ac-d2ea-73ca-bccd-5f2416eec4eb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_01a067ac-d2ea-7d8a-ad8a-143c931908a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_MunicipalBondsMember_01a067ac-d2ea-7d8a-ad8a-143c931908a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d2ea-7c98-828c-7c95f0f63939" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d2ea-7c98-828c-7c95f0f63939" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d2ea-71c8-bcf7-a52b160d3721" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d2ea-71c8-bcf7-a52b160d3721" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d2ea-71d3-8726-f7106ba5fc44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d2ea-71d3-8726-f7106ba5fc44" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherSecuritiesMember_01a067ac-d2ea-7de9-82fe-a3403c6cd2f5" xlink:href="hban-20260930.xsd#hban_OtherSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_hban_OtherSecuritiesMember_01a067ac-d2ea-7de9-82fe-a3403c6cd2f5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_NonmarketableEquitySecuritiesMember_01a067ac-d2ea-7faf-bd06-7a43a618d63c" xlink:href="hban-20260930.xsd#hban_NonmarketableEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_hban_NonmarketableEquitySecuritiesMember_01a067ac-d2ea-7faf-bd06-7a43a618d63c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_EquitySecuritiesAtCostMember_01a067ac-d2ea-7ca8-b23c-8afc7321adec" xlink:href="hban-20260930.xsd#hban_EquitySecuritiesAtCostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_hban_EquitySecuritiesAtCostMember_01a067ac-d2ea-7ca8-b23c-8afc7321adec" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MutualFundMember_01a067ac-d2ea-713d-8645-7186f5a3974d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MutualFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_MutualFundMember_01a067ac-d2ea-713d-8645-7186f5a3974d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_01a067ac-d2ea-782a-aaa4-fed073ea630c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7138-a28f-3369dba8c0fe" xlink:to="loc_us-gaap_EquitySecuritiesMember_01a067ac-d2ea-782a-aaa4-fed073ea630c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-758e-b342-bcd6d8c318bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hban_ScheduleofInvestmentSecuritiesandOtherSecuritiesTable_01a067ac-d2ea-77ca-b2fb-0cddd54b3908" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-758e-b342-bcd6d8c318bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-758e-b342-bcd6d8c318bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-758e-b342-bcd6d8c318bc" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-758e-b342-bcd6d8c318bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-795e-a0d2-b5dbbbe8d338" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d2ea-758e-b342-bcd6d8c318bc" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-795e-a0d2-b5dbbbe8d338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentinFederalReserveStockMember_01a067ac-d2ea-730d-8e38-29a368e95e45" xlink:href="hban-20260930.xsd#hban_InvestmentinFederalReserveStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-795e-a0d2-b5dbbbe8d338" xlink:to="loc_hban_InvestmentinFederalReserveStockMember_01a067ac-d2ea-730d-8e38-29a368e95e45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentInFederalHomeLoanBankStockMember_01a067ac-d2ea-7ae4-8b1d-423dd6eaa0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentInFederalHomeLoanBankStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d2ea-795e-a0d2-b5dbbbe8d338" xlink:to="loc_us-gaap_InvestmentInFederalHomeLoanBankStockMember_01a067ac-d2ea-7ae4-8b1d-423dd6eaa0bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d2ea-75d0-8660-cf1a6267c5f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d2ea-75d0-8660-cf1a6267c5f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_01a067ac-d2ea-7259-94be-d86796295e51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_01a067ac-d2ea-7259-94be-d86796295e51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_01a067ac-d2ea-74ef-b2df-a44c41c4fe1d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_01a067ac-d2ea-74ef-b2df-a44c41c4fe1d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d2ea-7df2-a0ad-b8581b93630c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-71cd-a79c-9c055986fb20" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d2ea-7df2-a0ad-b8581b93630c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesClassifiedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d2ea-71e7-aa36-30b2c2776e98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d2ea-71e7-aa36-30b2c2776e98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_01a067ac-d2ea-7945-a064-320d9395ff3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain_01a067ac-d2ea-7945-a064-320d9395ff3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_01a067ac-d2ea-7713-a1c6-376f91a747c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss_01a067ac-d2ea-7713-a1c6-376f91a747c1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_01a067ac-d2ea-7096-ab34-55ec1884ecb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7630-a3dd-4b1561890cd0" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_01a067ac-d2ea-7096-ab34-55ec1884ecb4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:href="hban-20260930.xsd#hban_OtherSecuritiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiCost_01a067ac-d2ea-70f0-94ab-f6c419f69775" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNiCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:to="loc_us-gaap_EquitySecuritiesFvNiCost_01a067ac-d2ea-70f0-94ab-f6c419f69775" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax_01a067ac-d2ea-7ee0-b5e1-64b521f75cfe" xlink:href="hban-20260930.xsd#hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:to="loc_hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainBeforeTax_01a067ac-d2ea-7ee0-b5e1-64b521f75cfe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax_01a067ac-d2ea-7abe-b0c8-7980653ab59f" xlink:href="hban-20260930.xsd#hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:to="loc_hban_EquitySecuritiesFVNIAccumulatedGrossUnrealizedLossBeforeTax_01a067ac-d2ea-7abe-b0c8-7980653ab59f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_01a067ac-d2ea-7f60-a30b-ee8d775f6c41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_OtherSecuritiesAmortizedCostAbstract_01a067ac-d2ea-762c-acfb-463c1ed75492" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_01a067ac-d2ea-7f60-a30b-ee8d775f6c41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-73fb-ab00-98fa1485a910" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-73fb-ab00-98fa1485a910" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-7861-aa7d-dc2c80a92859" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d2ea-7861-aa7d-dc2c80a92859" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d2ea-7129-ae8f-a17796e4b37d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ScheduleofinvestmentsecuritiesandothersecuritiesLineItems_01a067ac-d2ea-7fd7-909b-fcbb08c62f4e" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d2ea-7129-ae8f-a17796e4b37d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESContinuousUnrealizedLossPositionDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#INVESTMENTANDOTHERSECURITIESContinuousUnrealizedLossPositionDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESContinuousUnrealizedLossPositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureLineItems_01a067ac-d2ea-7d94-a154-155dc39d6afa" xlink:href="hban-20260930.xsd#hban_InvestmentsecuritiesandothersecuritiesdisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureTable_01a067ac-d2ea-779f-b102-fd30d28c153c" xlink:href="hban-20260930.xsd#hban_InvestmentsecuritiesandothersecuritiesdisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureLineItems_01a067ac-d2ea-7d94-a154-155dc39d6afa" xlink:to="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureTable_01a067ac-d2ea-779f-b102-fd30d28c153c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureTable_01a067ac-d2ea-779f-b102-fd30d28c153c" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d2ea-7ac7-abd9-c72d7eb1cb22" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d2ea-727a-89b8-01f06c362d17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d2ea-727a-89b8-01f06c362d17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d2ea-7933-8c41-4af2a3052474" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d2ea-7933-8c41-4af2a3052474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralizedMortgageObligationsMember_01a067ac-d2ea-7216-ab79-f2d169a6c4b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralizedMortgageObligationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:to="loc_us-gaap_CollateralizedMortgageObligationsMember_01a067ac-d2ea-7216-ab79-f2d169a6c4b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d2ea-727c-adaa-53d565d83c17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d2ea-727c-adaa-53d565d83c17" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherFederalAgenciesMember_01a067ac-d2ea-70f8-89df-c67521cb4170" xlink:href="hban-20260930.xsd#hban_OtherFederalAgenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember_01a067ac-d2ea-788b-9efb-eedc2b8b8359" xlink:to="loc_hban_OtherFederalAgenciesMember_01a067ac-d2ea-70f8-89df-c67521cb4170" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_01a067ac-d2ea-7037-8ea1-c15069bad30b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_MunicipalBondsMember_01a067ac-d2ea-7037-8ea1-c15069bad30b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d2ea-7dd7-aace-74165dafccf7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d2ea-7dd7-aace-74165dafccf7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d2ea-72b9-b4ae-201af8dfcabe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d2ea-72b9-b4ae-201af8dfcabe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d2ea-7582-a37d-691718af7393" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d2ea-7782-a928-5d308764471d" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d2ea-7582-a37d-691718af7393" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureLineItems_01a067ac-d2ea-7d94-a154-155dc39d6afa" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_01a067ac-d2ea-7487-844a-de92af15b5ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_01a067ac-d2ea-7487-844a-de92af15b5ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_01a067ac-d2ea-7fbd-b102-f29d28a21c2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_01a067ac-d2ea-7fbd-b102-f29d28a21c2b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_01a067ac-d2ea-71a3-9da8-ab5e6c620b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_01a067ac-d2ea-71a3-9da8-ab5e6c620b7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_01a067ac-d2ea-7ae1-bb23-9198ebcdee0a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_01a067ac-d2ea-7ae1-bb23-9198ebcdee0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_01a067ac-d2ea-7d5d-9f99-044d17f60340" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_01a067ac-d2ea-7d5d-9f99-044d17f60340" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_01a067ac-d2ea-702e-92bf-8d1437d0256b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_01a067ac-d2ea-7d03-a86c-dbc7126f2855" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_01a067ac-d2ea-702e-92bf-8d1437d0256b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesClassifiedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_InvestmentsecuritiesandothersecuritiesdisclosureLineItems_01a067ac-d2ea-7d94-a154-155dc39d6afa" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_01a067ac-d2ea-7754-9389-0c02d00e1c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue_01a067ac-d2ea-7754-9389-0c02d00e1c6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_01a067ac-d2ea-7085-a6c9-f7a407bc96bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_01a067ac-d2ea-7085-a6c9-f7a407bc96bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_01a067ac-d2ea-7c66-87be-48a60f0902b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue_01a067ac-d2ea-7c66-87be-48a60f0902b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_01a067ac-d2ea-7766-9e47-983961e4df94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_01a067ac-d2ea-7766-9e47-983961e4df94" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_01a067ac-d2ea-7a09-9a08-b503d3b46ebe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue_01a067ac-d2ea-7a09-9a08-b503d3b46ebe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_01a067ac-d2ea-7ff4-9b0c-8d86f3299419" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HeldToMaturitySecuritiesClassifiedAbstract_01a067ac-d2ea-7b72-8764-8dbe87a51f02" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss_01a067ac-d2ea-7ff4-9b0c-8d86f3299419" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESNarrativeDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#INVESTMENTANDOTHERSECURITIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/INVESTMENTANDOTHERSECURITIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentSecuritiesLineItems_01a067ac-d389-7e7f-ac3c-154dd4365cec" xlink:href="hban-20260930.xsd#hban_InvestmentSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentSecuritiesTable_01a067ac-d389-7fae-b2ce-2d257c843b72" xlink:href="hban-20260930.xsd#hban_InvestmentSecuritiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hban_InvestmentSecuritiesLineItems_01a067ac-d389-7e7f-ac3c-154dd4365cec" xlink:to="loc_hban_InvestmentSecuritiesTable_01a067ac-d389-7fae-b2ce-2d257c843b72" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_01a067ac-d389-7a71-b31b-d02bd498753f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hban_InvestmentSecuritiesTable_01a067ac-d389-7fae-b2ce-2d257c843b72" xlink:to="loc_us-gaap_PledgedStatusAxis_01a067ac-d389-7a71-b31b-d02bd498753f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_01a067ac-d389-7a71-b31b-d02bd498753f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_01a067ac-d389-7a71-b31b-d02bd498753f" xlink:to="loc_us-gaap_PledgedStatusDomain_01a067ac-d389-7a71-b31b-d02bd498753f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_01a067ac-d389-7d6c-a614-e52dff468dd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_01a067ac-d389-7a71-b31b-d02bd498753f" xlink:to="loc_us-gaap_PledgedStatusDomain_01a067ac-d389-7d6c-a614-e52dff468dd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_01a067ac-d389-76d8-9a65-e34d201aec67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_01a067ac-d389-7d6c-a614-e52dff468dd7" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_01a067ac-d389-76d8-9a65-e34d201aec67" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7f49-b330-c99cfbfee5ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_InvestmentSecuritiesLineItems_01a067ac-d389-7e7f-ac3c-154dd4365cec" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7f49-b330-c99cfbfee5ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-75d4-8cd3-03bbb4ee9838" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_InvestmentSecuritiesLineItems_01a067ac-d389-7e7f-ac3c-154dd4365cec" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-75d4-8cd3-03bbb4ee9838" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecurities_01a067ac-d389-7452-8e6e-fc2fae5887cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_InvestmentSecuritiesLineItems_01a067ac-d389-7e7f-ac3c-154dd4365cec" xlink:to="loc_us-gaap_DebtSecurities_01a067ac-d389-7452-8e6e-fc2fae5887cf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESLoanandLeasePortfolioCompositionDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESLoanandLeasePortfolioCompositionDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESLoanandLeasePortfolioCompositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7a8f-b2f5-7e407a3eac16" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7a8f-b2f5-7e407a3eac16" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7a86-864c-9780200720c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7a8f-b2f5-7e407a3eac16" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7a86-864c-9780200720c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7a86-864c-9780200720c1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7a86-864c-9780200720c1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7a86-864c-9780200720c1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7b5a-b9d6-d23f40ccc973" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7a86-864c-9780200720c1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7b5a-b9d6-d23f40ccc973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7364-9ab3-f6cd367ebb59" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7b5a-b9d6-d23f40ccc973" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7364-9ab3-f6cd367ebb59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7267-94e0-4cc6b1ab4b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7b5a-b9d6-d23f40ccc973" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7267-94e0-4cc6b1ab4b1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7ecb-9679-c474da36a987" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7a8f-b2f5-7e407a3eac16" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7ecb-9679-c474da36a987" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7ecb-9679-c474da36a987_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7ecb-9679-c474da36a987" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7ecb-9679-c474da36a987_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7ecb-9679-c474da36a987" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-774c-a206-ab7721eefe66" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-774c-a206-ab7721eefe66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7bca-8fc8-b7a7097aef9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7bca-8fc8-b7a7097aef9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingLeaseMember_01a067ac-d389-7a22-bc9c-d44d87051e7d" xlink:href="hban-20260930.xsd#hban_FinancingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_hban_FinancingLeaseMember_01a067ac-d389-7a22-bc9c-d44d87051e7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-78d1-b82a-8c02b213424a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-78d1-b82a-8c02b213424a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-76c6-84f2-f96d766cda67" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-76c6-84f2-f96d766cda67" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HomeEquityIncludingFVOMember_01a067ac-d389-7c07-ac01-4ee99304ae8f" xlink:href="hban-20260930.xsd#hban_HomeEquityIncludingFVOMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_hban_HomeEquityIncludingFVOMember_01a067ac-d389-7c07-ac01-4ee99304ae8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7911-8ffe-03b9a761ea1f" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7911-8ffe-03b9a761ea1f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherConsumerLoanMember_01a067ac-d389-7ad9-a18c-b3ee81968904" xlink:href="hban-20260930.xsd#hban_OtherConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7a84-99c1-173e2c8aa52f" xlink:to="loc_hban_OtherConsumerLoanMember_01a067ac-d389-7ad9-a18c-b3ee81968904" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7b3e-9ac6-c342d71a8249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7b3e-9ac6-c342d71a8249" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7ddf-9a47-201a613be256" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7ddf-9a47-201a613be256" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d389-7211-bf55-513014104aba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d389-7211-bf55-513014104aba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount_01a067ac-d389-7691-817c-6ed087cbb7b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount_01a067ac-d389-7691-817c-6ed087cbb7b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7f54-a328-c0a459fa6af0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7f40-9cb6-e208141deb96" xlink:to="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7f54-a328-c0a459fa6af0" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESDirectFinancingLeasesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESDirectFinancingLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESDirectFinancingLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7926-97d3-983fdbae8d1e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7926-97d3-983fdbae8d1e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-79a1-86e2-81f29e236f2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7926-97d3-983fdbae8d1e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-79a1-86e2-81f29e236f2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-79a1-86e2-81f29e236f2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-79a1-86e2-81f29e236f2f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-79a1-86e2-81f29e236f2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-738b-806f-3b7f56a4aa0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-79a1-86e2-81f29e236f2f" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-738b-806f-3b7f56a4aa0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-75df-a450-9d8bb95209eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-738b-806f-3b7f56a4aa0f" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-75df-a450-9d8bb95209eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectFinancingLeaseLeaseReceivable_01a067ac-d389-7dc3-9f03-8877db747f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DirectFinancingLeaseLeaseReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_DirectFinancingLeaseLeaseReceivable_01a067ac-d389-7dc3-9f03-8877db747f3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset_01a067ac-d389-76da-8299-a346139601b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_DirectFinancingLeaseUnguaranteedResidualAsset_01a067ac-d389-76da-8299-a346139601b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DirectFinancingLeaseGrossInvestmentInDirectFinancingLeases_01a067ac-d389-7462-980c-b7f162dab7e1" xlink:href="hban-20260930.xsd#hban_DirectFinancingLeaseGrossInvestmentInDirectFinancingLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_hban_DirectFinancingLeaseGrossInvestmentInDirectFinancingLeases_01a067ac-d389-7462-980c-b7f162dab7e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DirectFinancingLeasesInitialDirectCosts_01a067ac-d389-7f20-ae7f-997ee2053d85" xlink:href="hban-20260930.xsd#hban_DirectFinancingLeasesInitialDirectCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_hban_DirectFinancingLeasesInitialDirectCosts_01a067ac-d389-7f20-ae7f-997ee2053d85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectFinancingLeaseDeferredSellingProfit_01a067ac-d389-77b5-bda8-38da2836ad9e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DirectFinancingLeaseDeferredSellingProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_DirectFinancingLeaseDeferredSellingProfit_01a067ac-d389-77b5-bda8-38da2836ad9e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7771-96d4-1463ca3fe03f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_DirectFinancingLeaseNetInvestmentInLeaseExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7771-96d4-1463ca3fe03f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidualValueOfLeasedAsset_01a067ac-d389-7137-a2d5-5396bdd973e7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidualValueOfLeasedAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_ResidualValueOfLeasedAsset_01a067ac-d389-7137-a2d5-5396bdd973e7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_01a067ac-d389-7cc6-be23-17b9c4eae1ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceived_01a067ac-d389-7cc6-be23-17b9c4eae1ef" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_01a067ac-d389-720c-b476-04b867e55a12" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedNextTwelveMonths_01a067ac-d389-720c-b476-04b867e55a12" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_01a067ac-d389-7dfb-8ee6-64a13bb1002c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedTwoYears_01a067ac-d389-7dfb-8ee6-64a13bb1002c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_01a067ac-d389-7bde-9b2b-7745cd886374" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThreeYears_01a067ac-d389-7bde-9b2b-7745cd886374" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_01a067ac-d389-7e46-b332-899a94242e69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFourYears_01a067ac-d389-7e46-b332-899a94242e69" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_01a067ac-d389-7aeb-8c1f-910a71f867e0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedFiveYears_01a067ac-d389-7aeb-8c1f-910a71f867e0" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_01a067ac-d389-721f-aee2-64cb7439fd88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_SalesTypeAndDirectFinancingLeasesLeaseReceivablePaymentsToBeReceivedThereafter_01a067ac-d389-721f-aee2-64cb7439fd88" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectFinancingLeaseInterestIncome_01a067ac-d389-7ece-9b05-a6f243004d89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DirectFinancingLeaseInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7c61-863e-081a4f8b4cfc" xlink:to="loc_us-gaap_DirectFinancingLeaseInterestIncome_01a067ac-d389-7ece-9b05-a6f243004d89" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESNonaccrualLoansbyLoanClassDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESNonaccrualLoansbyLoanClassDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESNonaccrualLoansbyLoanClassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7215-9508-b979fa5245a8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7ea7-bb03-fde2fc41fbbf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7215-9508-b979fa5245a8" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7ea7-bb03-fde2fc41fbbf" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7fcc-ae49-767112a33e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7ea7-bb03-fde2fc41fbbf" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7fcc-ae49-767112a33e9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7fcc-ae49-767112a33e9b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7fcc-ae49-767112a33e9b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7fcc-ae49-767112a33e9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7c7f-8c64-15c938d3b8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7fcc-ae49-767112a33e9b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7c7f-8c64-15c938d3b8f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7af5-bd77-da016c8e255d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7c7f-8c64-15c938d3b8f1" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7af5-bd77-da016c8e255d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-750b-a04f-81ee5a6c7d5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7c7f-8c64-15c938d3b8f1" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-750b-a04f-81ee5a6c7d5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-71cb-be75-cb103733b6d4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7ea7-bb03-fde2fc41fbbf" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-71cb-be75-cb103733b6d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-71cb-be75-cb103733b6d4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-71cb-be75-cb103733b6d4" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-71cb-be75-cb103733b6d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-71cb-be75-cb103733b6d4" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7b6a-b43f-3c083accad6f" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7b6a-b43f-3c083accad6f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7ec3-819b-bf0622678ae3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7ec3-819b-bf0622678ae3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingLeaseMember_01a067ac-d389-76c2-a603-44f014dd5c2a" xlink:href="hban-20260930.xsd#hban_FinancingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_hban_FinancingLeaseMember_01a067ac-d389-76c2-a603-44f014dd5c2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-77e6-878e-a24e10369d9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-77e6-878e-a24e10369d9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7071-bf91-5058f794c267" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7071-bf91-5058f794c267" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-77c2-8711-345dd18d8c85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-77c2-8711-345dd18d8c85" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7332-8ddb-5bdc825d9314" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7332-8ddb-5bdc825d9314" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerLoanMember_01a067ac-d389-7436-ad90-c158a75144df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7e76-a3fe-28403f739ecb" xlink:to="loc_us-gaap_ConsumerLoanMember_01a067ac-d389-7436-ad90-c158a75144df" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableNonaccrualNoAllowance_01a067ac-d389-7fe4-8f67-4849613add33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableNonaccrualNoAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7215-9508-b979fa5245a8" xlink:to="loc_us-gaap_FinancingReceivableNonaccrualNoAllowance_01a067ac-d389-7fe4-8f67-4849613add33" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_01a067ac-d389-7bad-bd70-133133c8275f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7215-9508-b979fa5245a8" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_01a067ac-d389-7bad-bd70-133133c8275f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESNALsPastDueDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESNALsPastDueDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESNALsPastDueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7426-bdb3-24db1ef8433d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7eea-b4f9-0362cb4bc436" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7426-bdb3-24db1ef8433d" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7eea-b4f9-0362cb4bc436" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7d0d-adaa-229003d5bd4d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7eea-b4f9-0362cb4bc436" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7d0d-adaa-229003d5bd4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7d0d-adaa-229003d5bd4d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7d0d-adaa-229003d5bd4d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7d0d-adaa-229003d5bd4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-7d0d-adaa-229003d5bd4d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7ce7-8acd-94a08c327be0" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7ce7-8acd-94a08c327be0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-75ad-9dfd-d04e0a9cf87f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-75ad-9dfd-d04e0a9cf87f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingLeaseMember_01a067ac-d389-78a5-99ee-60ecf5326cdd" xlink:href="hban-20260930.xsd#hban_FinancingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_hban_FinancingLeaseMember_01a067ac-d389-78a5-99ee-60ecf5326cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-78c4-8f44-8caf0fc11885" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-78c4-8f44-8caf0fc11885" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7674-a3c5-a53e79bec41a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7674-a3c5-a53e79bec41a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-75d2-b24b-15b62d96d1fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-75d2-b24b-15b62d96d1fc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7030-abb8-d3365661260e" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7030-abb8-d3365661260e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherConsumerLoanMember_01a067ac-d389-77c2-a63c-77ec72433d9c" xlink:href="hban-20260930.xsd#hban_OtherConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72c5-a54c-92442203509a" xlink:to="loc_hban_OtherConsumerLoanMember_01a067ac-d389-77c2-a63c-77ec72433d9c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7426-879b-93dcb95143cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7eea-b4f9-0362cb4bc436" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7426-879b-93dcb95143cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7426-879b-93dcb95143cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7426-879b-93dcb95143cf" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7426-879b-93dcb95143cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-719e-ba7b-2f8fd2859224" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7426-879b-93dcb95143cf" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-719e-ba7b-2f8fd2859224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-74e1-b429-b824f09ce74b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-719e-ba7b-2f8fd2859224" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-74e1-b429-b824f09ce74b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_01a067ac-d389-7485-a1fe-ba434fae49d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-74e1-b429-b824f09ce74b" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_01a067ac-d389-7485-a1fe-ba434fae49d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_01a067ac-d389-748e-8c0e-d2b756fd9249" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-74e1-b429-b824f09ce74b" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_01a067ac-d389-748e-8c0e-d2b756fd9249" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7991-b230-d3951f2a81f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-74e1-b429-b824f09ce74b" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7991-b230-d3951f2a81f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_01a067ac-d389-7778-8fe1-d1bd54ad2b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-719e-ba7b-2f8fd2859224" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_01a067ac-d389-7778-8fe1-d1bd54ad2b5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7299-9396-f12c04ecb3c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7426-bdb3-24db1ef8433d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7299-9396-f12c04ecb3c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-7554-926a-301e00fa1bb0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7426-bdb3-24db1ef8433d" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-7554-926a-301e00fa1bb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_01a067ac-d389-7eb0-9336-bdd50c3de5da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7426-bdb3-24db1ef8433d" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing_01a067ac-d389-7eb0-9336-bdd50c3de5da" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESVintageandCreditQualityDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESVintageandCreditQualityDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESVintageandCreditQualityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-72b2-8d76-a067615f7556" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-72b2-8d76-a067615f7556" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-72b2-8d76-a067615f7556_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-72b2-8d76-a067615f7556" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-72b2-8d76-a067615f7556_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-76e1-a67d-f3d5140704b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-72b2-8d76-a067615f7556" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-76e1-a67d-f3d5140704b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-71c1-8074-2ad5270eb671" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-76e1-a67d-f3d5140704b5" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-71c1-8074-2ad5270eb671" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7371-9b40-9c978bee4908" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-76e1-a67d-f3d5140704b5" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7371-9b40-9c978bee4908" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-769b-bf45-f1503fec7efc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-769b-bf45-f1503fec7efc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-769b-bf45-f1503fec7efc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-769b-bf45-f1503fec7efc" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-769b-bf45-f1503fec7efc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-769b-bf45-f1503fec7efc" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-70dc-a2e8-f0be37460593" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-70dc-a2e8-f0be37460593" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_01a067ac-d389-7d42-93fe-40d0fdaf1d84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_01a067ac-d389-7d42-93fe-40d0fdaf1d84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingLeaseMember_01a067ac-d389-72fd-aae6-5f52665fe36d" xlink:href="hban-20260930.xsd#hban_FinancingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_hban_FinancingLeaseMember_01a067ac-d389-72fd-aae6-5f52665fe36d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ResidentialLoanMember_01a067ac-d389-7cbd-99f9-c5efcaf37d27" xlink:href="hban-20260930.xsd#hban_ResidentialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_hban_ResidentialLoanMember_01a067ac-d389-7cbd-99f9-c5efcaf37d27" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7902-8c7f-347c2ca7ed51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7902-8c7f-347c2ca7ed51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-7534-a955-54c6201da266" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-7534-a955-54c6201da266" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-75a0-9316-dd409d868b3a" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-75a0-9316-dd409d868b3a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherConsumerLoanMember_01a067ac-d389-72ec-92e3-a2444ed8999a" xlink:href="hban-20260930.xsd#hban_OtherConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-7cac-9e26-6031c4dfaccb" xlink:to="loc_hban_OtherConsumerLoanMember_01a067ac-d389-72ec-92e3-a2444ed8999a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditScoreFicoAxis_01a067ac-d389-751d-bc46-445f98d8cbd5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditScoreFicoAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:to="loc_us-gaap_CreditScoreFicoAxis_01a067ac-d389-751d-bc46-445f98d8cbd5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-751d-bc46-445f98d8cbd5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditScoreFicoDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditScoreFicoAxis_01a067ac-d389-751d-bc46-445f98d8cbd5" xlink:to="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-751d-bc46-445f98d8cbd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-7713-be7d-45af32d56c15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditScoreFicoDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditScoreFicoAxis_01a067ac-d389-751d-bc46-445f98d8cbd5" xlink:to="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-7713-be7d-45af32d56c15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FICOScoreGreaterthan750Member_01a067ac-d389-7ab8-a39a-4e2aee594d31" xlink:href="hban-20260930.xsd#hban_FICOScoreGreaterthan750Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-7713-be7d-45af32d56c15" xlink:to="loc_hban_FICOScoreGreaterthan750Member_01a067ac-d389-7ab8-a39a-4e2aee594d31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FICOScore650749Member_01a067ac-d389-7719-b59f-d4b0fa73fa20" xlink:href="hban-20260930.xsd#hban_FICOScore650749Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-7713-be7d-45af32d56c15" xlink:to="loc_hban_FICOScore650749Member_01a067ac-d389-7719-b59f-d4b0fa73fa20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FICOScoreLessthan650Member_01a067ac-d389-7798-9346-284c4b1123d9" xlink:href="hban-20260930.xsd#hban_FICOScoreLessthan650Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditScoreFicoDomain_01a067ac-d389-7713-be7d-45af32d56c15" xlink:to="loc_hban_FICOScoreLessthan650Member_01a067ac-d389-7798-9346-284c4b1123d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_01a067ac-d389-7f13-b96e-ba0e9b2d4608" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-7103-9a66-1f90e72038bc" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_01a067ac-d389-7f13-b96e-ba0e9b2d4608" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-7f13-b96e-ba0e9b2d4608_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_01a067ac-d389-7f13-b96e-ba0e9b2d4608" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-7f13-b96e-ba0e9b2d4608_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-719c-baa8-8d1ee60191f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_01a067ac-d389-7f13-b96e-ba0e9b2d4608" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-719c-baa8-8d1ee60191f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_01a067ac-d389-7cb3-aebc-1b75075ab6f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-719c-baa8-8d1ee60191f8" xlink:to="loc_us-gaap_PassMember_01a067ac-d389-7cb3-aebc-1b75075ab6f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_01a067ac-d389-7eea-a69e-266e16ead301" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-719c-baa8-8d1ee60191f8" xlink:to="loc_us-gaap_SpecialMentionMember_01a067ac-d389-7eea-a69e-266e16ead301" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember_01a067ac-d389-7938-a0c8-337402e1cbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubstandardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_01a067ac-d389-719c-baa8-8d1ee60191f8" xlink:to="loc_us-gaap_SubstandardMember_01a067ac-d389-7938-a0c8-337402e1cbc7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_01a067ac-d389-79fc-bfdf-986b3c1ffb96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_01a067ac-d389-79fc-bfdf-986b3c1ffb96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_01a067ac-d389-7d15-95e1-96b6a3d84fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_01a067ac-d389-7d15-95e1-96b6a3d84fb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_01a067ac-d389-7f85-8364-c9eaa1b3fba9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_01a067ac-d389-7f85-8364-c9eaa1b3fba9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_01a067ac-d389-75ec-a8ae-ce2b370e64e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_01a067ac-d389-75ec-a8ae-ce2b370e64e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_01a067ac-d389-78f0-bb92-657ee424d74a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_01a067ac-d389-78f0-bb92-657ee424d74a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_01a067ac-d389-7b55-88dc-a9155ae47845" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_01a067ac-d389-7b55-88dc-a9155ae47845" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_01a067ac-d389-7f41-8944-27b535db49d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_01a067ac-d389-7f41-8944-27b535db49d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_01a067ac-d389-7c1c-a170-60f1f85e3f7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan_01a067ac-d389-7c1c-a170-60f1f85e3f7b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7a71-ad78-f7d62405e293" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-719d-8584-b78c39b1bb18" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d389-7a71-ad78-f7d62405e293" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESGrossChargeoffsofLoansandLeasesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESGrossChargeoffsofLoansandLeasesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESGrossChargeoffsofLoansandLeasesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-72af-929a-8fcd2634a80c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-72af-929a-8fcd2634a80c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73ea-a2a4-73708473df08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-72af-929a-8fcd2634a80c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73ea-a2a4-73708473df08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-73ea-a2a4-73708473df08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73ea-a2a4-73708473df08" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-73ea-a2a4-73708473df08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73ea-a2a4-73708473df08" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7d1c-a228-1f8acec28f8c" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7d1c-a228-1f8acec28f8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-75db-acb9-6cc4514763b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-75db-acb9-6cc4514763b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingLeaseMember_01a067ac-d389-73c6-a1f1-d46f704d5e8f" xlink:href="hban-20260930.xsd#hban_FinancingLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_hban_FinancingLeaseMember_01a067ac-d389-73c6-a1f1-d46f704d5e8f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7433-a08d-eafff3d53769" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7433-a08d-eafff3d53769" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7c75-9fef-9dbc36b8e62d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-7c75-9fef-9dbc36b8e62d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-70e1-92ca-be0d0c9179ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-70e1-92ca-be0d0c9179ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-70c1-9b9b-7687122de7be" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-70c1-9b9b-7687122de7be" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherConsumerLoanMember_01a067ac-d389-7f57-b930-a77f6aa3596a" xlink:href="hban-20260930.xsd#hban_OtherConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-72fa-ad79-9bd283cf6f9b" xlink:to="loc_hban_OtherConsumerLoanMember_01a067ac-d389-7f57-b930-a77f6aa3596a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-75ad-95ce-0b5fbea8574e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_01a067ac-d389-72af-929a-8fcd2634a80c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-75ad-95ce-0b5fbea8574e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-75ad-95ce-0b5fbea8574e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-75ad-95ce-0b5fbea8574e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-75ad-95ce-0b5fbea8574e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7731-9fbc-e36295944bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-75ad-95ce-0b5fbea8574e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7731-9fbc-e36295944bfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-74d2-bd87-d41675dac9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7731-9fbc-e36295944bfb" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-74d2-bd87-d41675dac9e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7920-a7d5-538a1904416c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7731-9fbc-e36295944bfb" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7920-a7d5-538a1904416c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_01a067ac-d389-78eb-a0c7-d3c9b925e150" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_01a067ac-d389-78eb-a0c7-d3c9b925e150" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_01a067ac-d389-75ed-8367-5566d50b58c3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_01a067ac-d389-75ed-8367-5566d50b58c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-70d4-847e-c8ffecf45c63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-70d4-847e-c8ffecf45c63" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-748d-b888-f947d85b22ab" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-748d-b888-f947d85b22ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-70f0-a606-a29268489601" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-70f0-a606-a29268489601" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-7b02-ac1c-156f5e01836b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_01a067ac-d389-7b02-ac1c-156f5e01836b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_01a067ac-d389-7c41-8695-ccea5fda8673" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_01a067ac-d389-7c41-8695-ccea5fda8673" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_01a067ac-d389-7128-8226-dbf1f704b08c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff_01a067ac-d389-7128-8226-dbf1f704b08c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_01a067ac-d389-7046-96fc-c486f02216c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_01a067ac-d389-770a-b52c-9899bb1070b6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_01a067ac-d389-7046-96fc-c486f02216c7" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/LOANSANDLEASESModificationsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#LOANSANDLEASESModificationsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/LOANSANDLEASESModificationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModificationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationAxis_01a067ac-d389-70f4-9bdd-cefce8349c40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:to="loc_us-gaap_LoanRestructuringModificationAxis_01a067ac-d389-70f4-9bdd-cefce8349c40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-70f4-9bdd-cefce8349c40_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_01a067ac-d389-70f4-9bdd-cefce8349c40" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-70f4-9bdd-cefce8349c40_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoanRestructuringModificationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanRestructuringModificationAxis_01a067ac-d389-70f4-9bdd-cefce8349c40" xlink:to="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractualInterestRateReductionMember_01a067ac-d389-71ec-81e4-9e7aae3eedf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractualInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:to="loc_us-gaap_ContractualInterestRateReductionMember_01a067ac-d389-71ec-81e4-9e7aae3eedf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtendedMaturityMember_01a067ac-d389-7e75-8c50-7934c9c4030f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ExtendedMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:to="loc_us-gaap_ExtendedMaturityMember_01a067ac-d389-7e75-8c50-7934c9c4030f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentDeferralMember_01a067ac-d389-72d0-b149-f12d61c5a482" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PaymentDeferralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:to="loc_us-gaap_PaymentDeferralMember_01a067ac-d389-72d0-b149-f12d61c5a482" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ExtendedMaturityAndInterestRateReductionMember_01a067ac-d389-76f2-b620-508a0d90ca05" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ExtendedMaturityAndInterestRateReductionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanRestructuringModificationDomain_01a067ac-d389-71a0-aa36-b1fd3088ec79" xlink:to="loc_us-gaap_ExtendedMaturityAndInterestRateReductionMember_01a067ac-d389-76f2-b620-508a0d90ca05" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7417-9fd8-9f00ba9a48ee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7417-9fd8-9f00ba9a48ee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7417-9fd8-9f00ba9a48ee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7417-9fd8-9f00ba9a48ee" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7417-9fd8-9f00ba9a48ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7829-9a1e-a72db9090212" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7417-9fd8-9f00ba9a48ee" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7829-9a1e-a72db9090212" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7a78-8d7d-eb40614cee39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7829-9a1e-a72db9090212" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-7a78-8d7d-eb40614cee39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7fc8-8cee-b99f6902e2b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7829-9a1e-a72db9090212" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7fc8-8cee-b99f6902e2b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73bf-91c0-681746f9f4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73bf-91c0-681746f9f4f6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-73bf-91c0-681746f9f4f6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73bf-91c0-681746f9f4f6" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-73bf-91c0-681746f9f4f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_01a067ac-d389-73bf-91c0-681746f9f4f6" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7c2f-8ae1-b8876cf4a8ca" xlink:href="hban-20260930.xsd#hban_CommercialandIndustrialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_hban_CommercialandIndustrialLoanMember_01a067ac-d389-7c2f-8ae1-b8876cf4a8ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7d2d-9492-5d3af82b5caf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d389-7d2d-9492-5d3af82b5caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7df2-bab8-24f068720b29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7df2-bab8-24f068720b29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-72e1-9644-e5b34372eabc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AutomobileLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_us-gaap_AutomobileLoanMember_01a067ac-d389-72e1-9644-e5b34372eabc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-732c-815e-6fbccd3a6fe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HomeEquityLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_us-gaap_HomeEquityLoanMember_01a067ac-d389-732c-815e-6fbccd3a6fe1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7da4-92af-fe1c3d9e0fc2" xlink:href="hban-20260930.xsd#hban_RVandMarineFinanceLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_hban_RVandMarineFinanceLoanMember_01a067ac-d389-7da4-92af-fe1c3d9e0fc2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherConsumerLoanMember_01a067ac-d389-781f-bcfa-43b4f7e9c1d8" xlink:href="hban-20260930.xsd#hban_OtherConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_01a067ac-d389-753d-982c-6b7db7c14dfb" xlink:to="loc_hban_OtherConsumerLoanMember_01a067ac-d389-781f-bcfa-43b4f7e9c1d8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-771b-91b2-62cc5367cf58" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-771b-91b2-62cc5367cf58" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-771b-91b2-62cc5367cf58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-771b-91b2-62cc5367cf58" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-771b-91b2-62cc5367cf58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-771b-91b2-62cc5367cf58" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_01a067ac-d389-771f-bd65-71785eb08caf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_01a067ac-d389-771f-bd65-71785eb08caf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_01a067ac-d389-7b43-ac56-6289ab2867c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_01a067ac-d389-7b43-ac56-6289ab2867c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7b03-9a36-6caaefe332c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7b03-9a36-6caaefe332c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-73d0-9705-845b85e129e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_01a067ac-d389-73d0-9705-845b85e129e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_01a067ac-d389-720e-939c-1360f41784fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-742f-a7df-b3e640f0ae61" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_01a067ac-d389-720e-939c-1360f41784fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a067ac-d389-7f80-816f-dc8d99f984aa" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableTroubledDebtRestructuringsTable_01a067ac-d389-7f04-b692-c303dfc245c7" xlink:to="loc_srt_RangeAxis_01a067ac-d389-7f80-816f-dc8d99f984aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d389-7f80-816f-dc8d99f984aa_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a067ac-d389-7f80-816f-dc8d99f984aa" xlink:to="loc_srt_RangeMember_01a067ac-d389-7f80-816f-dc8d99f984aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d389-7eb1-bc08-d33787419faf" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a067ac-d389-7f80-816f-dc8d99f984aa" xlink:to="loc_srt_RangeMember_01a067ac-d389-7eb1-bc08-d33787419faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a067ac-d389-7aec-b0df-fb7112aa4281" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d389-7eb1-bc08-d33787419faf" xlink:to="loc_srt_MinimumMember_01a067ac-d389-7aec-b0df-fb7112aa4281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a067ac-d389-76ec-85c2-e954bb511768" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d389-7eb1-bc08-d33787419faf" xlink:to="loc_srt_MaximumMember_01a067ac-d389-76ec-85c2-e954bb511768" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_01a067ac-d389-7fd7-849b-22c9c6fc84f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPeriod_01a067ac-d389-7fd7-849b-22c9c6fc84f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_01a067ac-d389-72c2-8225-3b4da945b50c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_FinancingReceivableModificationToTotalFinancingReceivablesExcludingAccruedInterestPercent_01a067ac-d389-72c2-8225-3b4da945b50c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification_01a067ac-d389-74e3-85dd-0fb28d81bfb3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageInterestRateDecreaseFromModification_01a067ac-d389-74e3-85dd-0fb28d81bfb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_01a067ac-d389-7585-b1d0-fc311c131e98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_FinancingReceivableModifiedWeightedAverageTermIncreaseFromModification_01a067ac-d389-7585-b1d0-fc311c131e98" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_01a067ac-d389-7012-b592-e302c7a0ff41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableModificationsLineItems_01a067ac-d389-780c-80da-a5f4e165c2f7" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestModifiedPast12Months_01a067ac-d389-7012-b592-e302c7a0ff41" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ALLOWANCEFORCREDITLOSSESAllowanceRollforwardDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#ALLOWANCEFORCREDITLOSSESAllowanceRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ALLOWANCEFORCREDITLOSSESAllowanceRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7b7a-b545-7d58a3958cdc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7836-8523-6ce46edeb05b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7b7a-b545-7d58a3958cdc" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7836-8523-6ce46edeb05b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7f0c-b2bc-d85d4b045700" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7836-8523-6ce46edeb05b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7f0c-b2bc-d85d4b045700" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7f0c-b2bc-d85d4b045700_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7f0c-b2bc-d85d4b045700" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7f0c-b2bc-d85d4b045700_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7d56-916d-a2083efc7823" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-7f0c-b2bc-d85d4b045700" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7d56-916d-a2083efc7823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-701a-b383-9664fe21d761" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7d56-916d-a2083efc7823" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-701a-b383-9664fe21d761" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-784d-ae38-23dba6eedee3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7d56-916d-a2083efc7823" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-784d-ae38-23dba6eedee3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7108-a884-bb64d86c1294" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7836-8523-6ce46edeb05b" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7108-a884-bb64d86c1294" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7108-a884-bb64d86c1294_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7108-a884-bb64d86c1294" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7108-a884-bb64d86c1294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7a21-b165-9d2c6f909543" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7108-a884-bb64d86c1294" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7a21-b165-9d2c6f909543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d389-7dbf-a0fc-70276b3dc9f2" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7a21-b165-9d2c6f909543" xlink:to="loc_hban_CadenceBankMember_01a067ac-d389-7dbf-a0fc-70276b3dc9f2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7b7a-b545-7d58a3958cdc" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7efa-b5fc-b2a5839da615" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7efa-b5fc-b2a5839da615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_01a067ac-d389-7b45-b261-91dd12f94f30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_01a067ac-d389-7b45-b261-91dd12f94f30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_01a067ac-d389-7a4f-aa9e-3fc401323ec0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_01a067ac-d389-7a4f-aa9e-3fc401323ec0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_01a067ac-d389-7bdc-a89f-e4e21ce586a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_01a067ac-d389-7bdc-a89f-e4e21ce586a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease_01a067ac-d389-717c-ad84-7d3e95ad315f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncrease_01a067ac-d389-717c-ad84-7d3e95ad315f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedSeasonedLoan_01a067ac-d389-7a7d-bf2e-69ba83ab13d5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedSeasonedLoan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossPurchasedSeasonedLoan_01a067ac-d389-7a7d-bf2e-69ba83ab13d5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7ee6-86b9-0271817afe02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_01a067ac-d389-71bf-8eee-0a54fdfed352" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffBalanceSheetCreditLossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiability_01a067ac-d389-71bf-8eee-0a54fdfed352" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_01a067ac-d389-7ef0-b2f6-bc9148422157" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_01a067ac-d389-7ef0-b2f6-bc9148422157" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OffBalanceSheetCreditLossLiabilityPurchased_01a067ac-d389-78f6-a8a8-46ad2b7ad052" xlink:href="hban-20260930.xsd#hban_OffBalanceSheetCreditLossLiabilityPurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_hban_OffBalanceSheetCreditLossLiabilityPurchased_01a067ac-d389-78f6-a8a8-46ad2b7ad052" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_01a067ac-d389-76ea-a21d-390e240e384f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OffBalanceSheetCreditLossLiability"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_01a067ac-d389-760f-bbd2-ff96d456262d" xlink:href="hban-20260930.xsd#hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_01a067ac-d389-7a3b-ad3d-cc800c756c5c" xlink:to="loc_hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_01a067ac-d389-760f-bbd2-ff96d456262d" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/ALLOWANCEFORCREDITLOSSESNarrativeDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#ALLOWANCEFORCREDITLOSSESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/ALLOWANCEFORCREDITLOSSESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7ccb-ba5f-e79be8d546ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7d58-96e7-07cbb1897cf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7ccb-ba5f-e79be8d546ff" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7d58-96e7-07cbb1897cf4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-701d-82a4-3870a728768c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7d58-96e7-07cbb1897cf4" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-701d-82a4-3870a728768c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-701d-82a4-3870a728768c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-701d-82a4-3870a728768c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-701d-82a4-3870a728768c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7e7c-aa54-decd8764c476" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_01a067ac-d389-701d-82a4-3870a728768c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7e7c-aa54-decd8764c476" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-74ce-acc8-1a15c3b9c708" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7e7c-aa54-decd8764c476" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_01a067ac-d389-74ce-acc8-1a15c3b9c708" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7ce3-8728-50bab575b789" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_01a067ac-d389-7e7c-aa54-decd8764c476" xlink:to="loc_us-gaap_ConsumerPortfolioSegmentMember_01a067ac-d389-7ce3-8728-50bab575b789" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7dc2-bd51-5ddcf244e2f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_01a067ac-d389-7d58-96e7-07cbb1897cf4" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7dc2-bd51-5ddcf244e2f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7dc2-bd51-5ddcf244e2f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7dc2-bd51-5ddcf244e2f3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7dc2-bd51-5ddcf244e2f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7c92-bddc-d87c9b2f723b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7dc2-bd51-5ddcf244e2f3" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7c92-bddc-d87c9b2f723b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d389-79cf-aed4-5c3d9fa4abf8" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7c92-bddc-d87c9b2f723b" xlink:to="loc_hban_CadenceBankMember_01a067ac-d389-79cf-aed4-5c3d9fa4abf8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_01a067ac-d389-7251-904e-b0fd960eb061" xlink:href="hban-20260930.xsd#hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7ccb-ba5f-e79be8d546ff" xlink:to="loc_hban_FinancingReceivableAllowanceForCreditLossAndOffBalanceSheetCreditLossLiability_01a067ac-d389-7251-904e-b0fd960eb061" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_01a067ac-d389-7a15-8cb9-116115d7e288" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7ccb-ba5f-e79be8d546ff" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_01a067ac-d389-7a15-8cb9-116115d7e288" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7697-9d1f-2cbc0649a75e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_01a067ac-d389-7ccb-ba5f-e79be8d546ff" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_01a067ac-d389-7697-9d1f-2cbc0649a75e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtAmortizedValueLineItems_01a067ac-d389-7c75-a834-79b8573fd02c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtAmortizedValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtAmortizedValueTable_01a067ac-d389-7e89-aa9b-2aea82627e0b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtAmortizedValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ServicingAssetsAtAmortizedValueLineItems_01a067ac-d389-7c75-a834-79b8573fd02c" xlink:to="loc_us-gaap_ServicingAssetsAtAmortizedValueTable_01a067ac-d389-7e89-aa9b-2aea82627e0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-78e9-b6e7-db94829d233d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtAmortizedValueTable_01a067ac-d389-7e89-aa9b-2aea82627e0b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-78e9-b6e7-db94829d233d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-78e9-b6e7-db94829d233d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-78e9-b6e7-db94829d233d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-78e9-b6e7-db94829d233d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7dae-bb5e-bab4f4e45c0e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-78e9-b6e7-db94829d233d" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7dae-bb5e-bab4f4e45c0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7b28-9cb1-b9ef637296f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7dae-bb5e-bab4f4e45c0e" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7b28-9cb1-b9ef637296f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LoansWithServicingRetainedSold_01a067ac-d389-703b-abd5-d8d7c023b70a" xlink:href="hban-20260930.xsd#hban_LoansWithServicingRetainedSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtAmortizedValueLineItems_01a067ac-d389-7c75-a834-79b8573fd02c" xlink:to="loc_hban_LoansWithServicingRetainedSold_01a067ac-d389-703b-abd5-d8d7c023b70a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfMortgageLoans_01a067ac-d389-7c28-970a-6d2c2210a65f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnSaleOfMortgageLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtAmortizedValueLineItems_01a067ac-d389-7c75-a834-79b8573fd02c" xlink:to="loc_us-gaap_GainLossOnSaleOfMortgageLoans_01a067ac-d389-7c28-970a-6d2c2210a65f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_01a067ac-d389-79ea-ba58-5d34537f4506" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtAmortizedValueLineItems_01a067ac-d389-7c75-a834-79b8573fd02c" xlink:to="loc_us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets_01a067ac-d389-79ea-ba58-5d34537f4506" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-7acb-a207-5a4cc2d12566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-7a7f-ab29-ae842d75d9f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-7acb-a207-5a4cc2d12566" xlink:to="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-7a7f-ab29-ae842d75d9f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-709c-81aa-7278a40031b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-7a7f-ab29-ae842d75d9f0" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-709c-81aa-7278a40031b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-709c-81aa-7278a40031b4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-709c-81aa-7278a40031b4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-709c-81aa-7278a40031b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7b88-af67-ae01b19deddc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-709c-81aa-7278a40031b4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7b88-af67-ae01b19deddc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7219-a4cc-dce95c31417f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7b88-af67-ae01b19deddc" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-7219-a4cc-dce95c31417f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmountRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-7acb-a207-5a4cc2d12566" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_01a067ac-d389-737e-adad-11bc9b887648" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_01a067ac-d389-737e-adad-11bc9b887648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance_01a067ac-d389-71b6-b61f-b28363419edb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:to="loc_us-gaap_ServicingAssetAtFairValueOtherChangesThatAffectBalance_01a067ac-d389-71b6-b61f-b28363419edb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAdditions_01a067ac-d389-7034-972e-0fb2be546181" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAdditions_01a067ac-d389-7034-972e-0fb2be546181" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract_01a13130-a562-7b9a-b487-30b1745672f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueAmountRollForward_01a067ac-d389-7e02-8ddf-a809a3ef8147" xlink:to="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract_01a13130-a562-7b9a-b487-30b1745672f2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_TimeDecay_01a067ac-d389-7d91-a950-56a9321fe76c" xlink:href="hban-20260930.xsd#hban_TimeDecay"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract_01a13130-a562-7b9a-b487-30b1745672f2" xlink:to="loc_hban_TimeDecay_01a067ac-d389-7d91-a950-56a9321fe76c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ServicingAssetAtFairValuePayoffs_01a067ac-d389-73af-8e7c-eb4a0baeec6b" xlink:href="hban-20260930.xsd#hban_ServicingAssetAtFairValuePayoffs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract_01a13130-a562-7b9a-b487-30b1745672f2" xlink:to="loc_hban_ServicingAssetAtFairValuePayoffs_01a067ac-d389-73af-8e7c-eb4a0baeec6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_01a067ac-d389-7c01-94b2-aa0d6a69cf9a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptionsAbstract_01a13130-a562-7b9a-b487-30b1745672f2" xlink:to="loc_us-gaap_ServicingAssetAtFairValueChangesInFairValueResultingFromChangesInValuationInputsOrChangesInAssumptions_01a067ac-d389-7c01-94b2-aa0d6a69cf9a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_01a067ac-d389-7d3f-89cc-3179ae2c34fc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans_01a067ac-d389-7491-bd5a-45dabe692ac6" xlink:href="hban-20260930.xsd#hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-7acb-a207-5a4cc2d12566" xlink:to="loc_hban_UnpaidPrincipalBalanceOfThirdPartyServicedLoans_01a067ac-d389-7491-bd5a-45dabe692ac6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodKeyAssumptionsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodKeyAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/MORTGAGELOANSALESANDSERVICINGRIGHTSResidentialMortgagePortfolioMSRsFairValueMethodKeyAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-78a6-bd44-7c73190272de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-78a6-bd44-7c73190272de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis_01a067ac-d389-75d2-b43f-4fdd0d900bb5" xlink:href="hban-20260930.xsd#hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-78a6-bd44-7c73190272de" xlink:to="loc_hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis_01a067ac-d389-75d2-b43f-4fdd0d900bb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ServicingRightCarryingMethodDomain_01a067ac-d389-75d2-b43f-4fdd0d900bb5_default" xlink:href="hban-20260930.xsd#hban_ServicingRightCarryingMethodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis_01a067ac-d389-75d2-b43f-4fdd0d900bb5" xlink:to="loc_hban_ServicingRightCarryingMethodDomain_01a067ac-d389-75d2-b43f-4fdd0d900bb5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ServicingRightCarryingMethodDomain_01a067ac-d389-7f9f-9c62-7715ac0fcc7a" xlink:href="hban-20260930.xsd#hban_ServicingRightCarryingMethodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hban_SensitivityAnalysisOfFairValueOfServicingRightsAxis_01a067ac-d389-75d2-b43f-4fdd0d900bb5" xlink:to="loc_hban_ServicingRightCarryingMethodDomain_01a067ac-d389-7f9f-9c62-7715ac0fcc7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SensitivityAnalysisFairValueCarryingMethodMember_01a067ac-d389-7aef-bb83-e4342a81206b" xlink:href="hban-20260930.xsd#hban_SensitivityAnalysisFairValueCarryingMethodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ServicingRightCarryingMethodDomain_01a067ac-d389-7f9f-9c62-7715ac0fcc7a" xlink:to="loc_hban_SensitivityAnalysisFairValueCarryingMethodMember_01a067ac-d389-7aef-bb83-e4342a81206b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-70ae-bfa4-e113a1fa2035" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueTable_01a067ac-d389-78a6-bd44-7c73190272de" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-70ae-bfa4-e113a1fa2035" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-70ae-bfa4-e113a1fa2035_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-70ae-bfa4-e113a1fa2035" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-70ae-bfa4-e113a1fa2035_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c21-bb5a-a14928680af6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-70ae-bfa4-e113a1fa2035" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c21-bb5a-a14928680af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-77ed-92c0-28a72b8c8d9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c21-bb5a-a14928680af6" xlink:to="loc_us-gaap_ResidentialMortgageMember_01a067ac-d389-77ed-92c0-28a72b8c8d9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed_01a067ac-d389-7880-8e82-515850eefc17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed_01a067ac-d389-7880-8e82-515850eefc17" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed_01a067ac-d389-721f-87d0-c7fa319a0e51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed_01a067ac-d389-721f-87d0-c7fa319a0e51" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed_01a067ac-d389-7975-9222-770bd4d3eb02" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed_01a067ac-d389-7975-9222-770bd4d3eb02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_01a067ac-d389-78f4-a169-0b376f5c5b45" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate_01a067ac-d389-78f4-a169-0b376f5c5b45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate_01a067ac-d389-7d8e-94e2-91e2219a0c56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate_01a067ac-d389-7d8e-94e2-91e2219a0c56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate_01a067ac-d389-7989-bd84-0f551c893f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ServicingAssetsAtFairValueLineItems_01a067ac-d389-77bd-a2d2-bff537b7e533" xlink:to="loc_us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate_01a067ac-d389-7989-bd84-0f551c893f2d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_01a067ac-d389-71b2-9867-770be8e4c1d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7b14-8d00-df6b4f9f3a71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_01a067ac-d389-71b2-9867-770be8e4c1d0" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7b14-8d00-df6b4f9f3a71" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7f56-935a-905682adedca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7b14-8d00-df6b4f9f3a71" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7f56-935a-905682adedca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7f56-935a-905682adedca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7f56-935a-905682adedca" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7f56-935a-905682adedca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7919-87f5-9711c441db72" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7f56-935a-905682adedca" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7919-87f5-9711c441db72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d389-71af-9f00-9aad0a7cceb5" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7919-87f5-9711c441db72" xlink:to="loc_hban_CadenceBankMember_01a067ac-d389-71af-9f00-9aad0a7cceb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-7a6c-b8e9-ded09e862e1b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7b14-8d00-df6b4f9f3a71" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-7a6c-b8e9-ded09e862e1b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-7a6c-b8e9-ded09e862e1b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-7a6c-b8e9-ded09e862e1b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-7a6c-b8e9-ded09e862e1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-754a-b1fd-4ed45163ce62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-7a6c-b8e9-ded09e862e1b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-754a-b1fd-4ed45163ce62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_01a067ac-d389-74b4-a7e7-6630fcb5f8a2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-754a-b1fd-4ed45163ce62" xlink:to="loc_us-gaap_CoreDepositsMember_01a067ac-d389-74b4-a7e7-6630fcb5f8a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d389-7816-848d-0efb4522a656" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_01a067ac-d389-71b2-9867-770be8e4c1d0" xlink:to="loc_us-gaap_Goodwill_01a067ac-d389-7816-848d-0efb4522a656" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d389-7f7e-8bb7-f1d637c2fb85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_01a067ac-d389-71b2-9867-770be8e4c1d0" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_01a067ac-d389-7f7e-8bb7-f1d637c2fb85" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSScheduleofGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillLineItems_01a067ac-d389-7033-b12b-e027b4d42c08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7e8a-b9e6-e4f14265d6bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfGoodwillTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GoodwillLineItems_01a067ac-d389-7033-b12b-e027b4d42c08" xlink:to="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7e8a-b9e6-e4f14265d6bd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-70c0-8aa2-42210a36c9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7e8a-b9e6-e4f14265d6bd" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-70c0-8aa2-42210a36c9a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d389-70c0-8aa2-42210a36c9a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-70c0-8aa2-42210a36c9a0" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d389-70c0-8aa2-42210a36c9a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d389-7310-b793-b9113628016c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-70c0-8aa2-42210a36c9a0" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d389-7310-b793-b9113628016c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d389-7ebd-87ed-0f25bb0e0845" xlink:href="hban-20260930.xsd#hban_ConsumerAndBusinessBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d389-7310-b793-b9113628016c" xlink:to="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d389-7ebd-87ed-0f25bb0e0845" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialBankingMember_01a067ac-d389-7165-8fa3-b4b345314d31" xlink:href="hban-20260930.xsd#hban_CommercialBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d389-7310-b793-b9113628016c" xlink:to="loc_hban_CommercialBankingMember_01a067ac-d389-7165-8fa3-b4b345314d31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_01a067ac-d389-7ee5-b09e-f12d066f40d4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGoodwillTable_01a067ac-d389-7e8a-b9e6-e4f14265d6bd" xlink:to="loc_srt_ConsolidationItemsAxis_01a067ac-d389-7ee5-b09e-f12d066f40d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d389-7ee5-b09e-f12d066f40d4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d389-7ee5-b09e-f12d066f40d4" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d389-7ee5-b09e-f12d066f40d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d389-7a2b-aacf-01655e1de680" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d389-7ee5-b09e-f12d066f40d4" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d389-7a2b-aacf-01655e1de680" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_01a067ac-d389-7a3a-bda7-5cf240f042de" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a067ac-d389-7a2b-aacf-01655e1de680" xlink:to="loc_us-gaap_OperatingSegmentsMember_01a067ac-d389-7a3a-bda7-5cf240f042de" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_01a067ac-d389-7e6d-b273-abf7ef2de13c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillLineItems_01a067ac-d389-7033-b12b-e027b4d42c08" xlink:to="loc_us-gaap_GoodwillRollForward_01a067ac-d389-7e6d-b273-abf7ef2de13c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d389-7754-82e4-f73f7655ec5c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_01a067ac-d389-7e6d-b273-abf7ef2de13c" xlink:to="loc_us-gaap_Goodwill_01a067ac-d389-7754-82e4-f73f7655ec5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_01a067ac-d389-72e6-b328-2e1e7125dd84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_01a067ac-d389-7e6d-b273-abf7ef2de13c" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_01a067ac-d389-72e6-b328-2e1e7125dd84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillOtherIncreaseDecrease_01a067ac-d389-74c1-ac94-8e446ed3058d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GoodwillOtherIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_01a067ac-d389-7e6d-b273-abf7ef2de13c" xlink:to="loc_us-gaap_GoodwillOtherIncreaseDecrease_01a067ac-d389-74c1-ac94-8e446ed3058d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_01a067ac-d389-7b46-b8ec-caa9925a3267" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/GOODWILLANDOTHERINTANGIBLEASSETSIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a067ac-d389-7a23-bfcd-c2830239b6c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a067ac-d389-77b2-9b0f-5fb3686766a4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a067ac-d389-7a23-bfcd-c2830239b6c4" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a067ac-d389-77b2-9b0f-5fb3686766a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-762f-bfa2-d77629ea054b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_01a067ac-d389-77b2-9b0f-5fb3686766a4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-762f-bfa2-d77629ea054b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-762f-bfa2-d77629ea054b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-762f-bfa2-d77629ea054b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-762f-bfa2-d77629ea054b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-78a4-9a5f-7d8cd9cf45ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_01a067ac-d389-762f-bfa2-d77629ea054b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-78a4-9a5f-7d8cd9cf45ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_01a067ac-d389-7568-970c-13c18e0b41b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-78a4-9a5f-7d8cd9cf45ea" xlink:to="loc_us-gaap_CoreDepositsMember_01a067ac-d389-7568-970c-13c18e0b41b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsMember_01a067ac-d389-720c-87d8-0ac602596ad8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIntangibleAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_01a067ac-d389-78a4-9a5f-7d8cd9cf45ea" xlink:to="loc_us-gaap_OtherIntangibleAssetsMember_01a067ac-d389-720c-87d8-0ac602596ad8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a067ac-d389-77e7-a9e5-f1c26144a99d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a067ac-d389-7a23-bfcd-c2830239b6c4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_01a067ac-d389-77e7-a9e5-f1c26144a99d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_01a067ac-d389-77a6-8594-3ac16b748f33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a067ac-d389-7a23-bfcd-c2830239b6c4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_01a067ac-d389-77a6-8594-3ac16b748f33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_01a067ac-d389-7804-a9cb-80e9dd8abe68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_01a067ac-d389-7a23-bfcd-c2830239b6c4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_01a067ac-d389-7804-a9cb-80e9dd8abe68" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BORROWINGSScheduleofShortTermDebtDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BORROWINGSScheduleofShortTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BORROWINGSScheduleofShortTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_01a067ac-d389-7bc9-9367-f23bfc7b6253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_01a067ac-d389-7c50-a95c-c91c31dc08b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a067ac-d389-7bc9-9367-f23bfc7b6253" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_01a067ac-d389-7c50-a95c-c91c31dc08b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_01a067ac-d389-7a01-9c19-424b5161ad4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_01a067ac-d389-7c50-a95c-c91c31dc08b1" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_01a067ac-d389-7a01-9c19-424b5161ad4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-7a01-9c19-424b5161ad4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a067ac-d389-7a01-9c19-424b5161ad4f" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-7a01-9c19-424b5161ad4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-79ca-b303-f883e934de37" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_01a067ac-d389-7a01-9c19-424b5161ad4f" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-79ca-b303-f883e934de37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_01a067ac-d389-7fc0-b54a-161b1ef10866" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-79ca-b303-f883e934de37" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseMember_01a067ac-d389-7fc0-b54a-161b1ef10866" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesMember_01a067ac-d389-7b0c-9728-6b634bb5eb04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalHomeLoanBankAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-79ca-b303-f883e934de37" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesMember_01a067ac-d389-7b0c-9728-6b634bb5eb04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_01a067ac-d389-7c50-a730-1cad76b4dfe6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_01a067ac-d389-79ca-b303-f883e934de37" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_01a067ac-d389-7c50-a730-1cad76b4dfe6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_01a067ac-d389-7be1-9d7b-eb6b76e4e424" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_01a067ac-d389-7bc9-9367-f23bfc7b6253" xlink:to="loc_us-gaap_ShortTermBorrowings_01a067ac-d389-7be1-9d7b-eb6b76e4e424" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BORROWINGSNarrativeDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BORROWINGSNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BORROWINGSNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-7c53-bea3-e0753eff0b85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-7c53-bea3-e0753eff0b85" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7766-b129-b67100351be7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-7c53-bea3-e0753eff0b85" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7766-b129-b67100351be7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7766-b129-b67100351be7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7766-b129-b67100351be7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7766-b129-b67100351be7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7773-81fe-5e08ddeb14bb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7766-b129-b67100351be7" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7773-81fe-5e08ddeb14bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FixedToFloatingSeniorNotesDueApril122028Member_01a067ac-d389-7b62-9b5b-47d62277accc" xlink:href="hban-20260930.xsd#hban_FixedToFloatingSeniorNotesDueApril122028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7773-81fe-5e08ddeb14bb" xlink:to="loc_hban_FixedToFloatingSeniorNotesDueApril122028Member_01a067ac-d389-7b62-9b5b-47d62277accc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FixedRateSubordinatedNoteDueJanuary282041Member_01a067ac-d389-7777-aa92-aa71a7cb540d" xlink:href="hban-20260930.xsd#hban_FixedRateSubordinatedNoteDueJanuary282041Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7773-81fe-5e08ddeb14bb" xlink:to="loc_hban_FixedRateSubordinatedNoteDueJanuary282041Member_01a067ac-d389-7777-aa92-aa71a7cb540d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HuntingtonNationalBankUnsecuredNotesMaturingMarch2033Member_01a067ac-d389-7870-88cf-e86641e41a44" xlink:href="hban-20260930.xsd#hban_HuntingtonNationalBankUnsecuredNotesMaturingMarch2033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7773-81fe-5e08ddeb14bb" xlink:to="loc_hban_HuntingtonNationalBankUnsecuredNotesMaturingMarch2033Member_01a067ac-d389-7870-88cf-e86641e41a44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-79cb-8910-aec6fdbfcbfc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-7c53-bea3-e0753eff0b85" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-79cb-8910-aec6fdbfcbfc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79cb-8910-aec6fdbfcbfc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-79cb-8910-aec6fdbfcbfc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79cb-8910-aec6fdbfcbfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-79cb-8910-aec6fdbfcbfc" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_01a067ac-d389-7040-8d45-95a8f5705a98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:to="loc_us-gaap_SeniorNotesMember_01a067ac-d389-7040-8d45-95a8f5705a98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_01a067ac-d389-7ba1-9c3b-68073d0b8095" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:to="loc_us-gaap_SubordinatedDebtMember_01a067ac-d389-7ba1-9c3b-68073d0b8095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-70b2-8ed5-892c6695ba41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:to="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-70b2-8ed5-892c6695ba41" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_01a067ac-d389-7411-bce5-846de92be7f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-79e6-978f-53ff7f08ae19" xlink:to="loc_us-gaap_SecuredDebtMember_01a067ac-d389-7411-bce5-846de92be7f8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a067ac-d389-7b15-a607-eb80f7a98bfc" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-7c53-bea3-e0753eff0b85" xlink:to="loc_srt_RangeAxis_01a067ac-d389-7b15-a607-eb80f7a98bfc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d389-7b15-a607-eb80f7a98bfc_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a067ac-d389-7b15-a607-eb80f7a98bfc" xlink:to="loc_srt_RangeMember_01a067ac-d389-7b15-a607-eb80f7a98bfc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d389-702a-a69c-1ca33c4bd820" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a067ac-d389-7b15-a607-eb80f7a98bfc" xlink:to="loc_srt_RangeMember_01a067ac-d389-702a-a69c-1ca33c4bd820" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a067ac-d389-79d5-987a-be2d61d05794" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d389-702a-a69c-1ca33c4bd820" xlink:to="loc_srt_MinimumMember_01a067ac-d389-79d5-987a-be2d61d05794" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a067ac-d389-714b-8a14-d1d47f88c95a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d389-702a-a69c-1ca33c4bd820" xlink:to="loc_srt_MaximumMember_01a067ac-d389-714b-8a14-d1d47f88c95a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_01a067ac-d389-7fb0-9f89-b9015cb1fa9a" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d389-702a-a69c-1ca33c4bd820" xlink:to="loc_srt_WeightedAverageMember_01a067ac-d389-7fb0-9f89-b9015cb1fa9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral_01a067ac-d389-7ef5-be1b-1670fbd29053" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral_01a067ac-d389-7ef5-be1b-1670fbd29053" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SecuritiesSoldUnderAgreementsToRepurchaseTerm_01a067ac-d389-7160-96e9-ffe9718a8db2" xlink:href="hban-20260930.xsd#hban_SecuritiesSoldUnderAgreementsToRepurchaseTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_hban_SecuritiesSoldUnderAgreementsToRepurchaseTerm_01a067ac-d389-7160-96e9-ffe9718a8db2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_01a067ac-d389-782d-8e7b-8cbb17aa846c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_01a067ac-d389-782d-8e7b-8cbb17aa846c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a067ac-d389-7352-befe-40b227fbc643" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_01a067ac-d389-7352-befe-40b227fbc643" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_01a067ac-d389-7f89-8876-0f3ebf9f70f9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_01a067ac-d389-7f89-8876-0f3ebf9f70f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueOptionCreditRiskMitigationLossReferencePoolAmount_01a067ac-d389-797c-b071-9273709c09d4" xlink:href="hban-20260930.xsd#hban_FairValueOptionCreditRiskMitigationLossReferencePoolAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7f08-b1be-bd2fcfa52a48" xlink:to="loc_hban_FairValueOptionCreditRiskMitigationLossReferencePoolAmount_01a067ac-d389-797c-b071-9273709c09d4" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/BORROWINGSScheduleofLongTermDebtandDebtIssuancesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#BORROWINGSScheduleofLongTermDebtandDebtIssuancesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/BORROWINGSScheduleofLongTermDebtandDebtIssuancesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7d38-a589-43d7112d7289" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-764d-bcec-7b37ec336ea2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7d38-a589-43d7112d7289" xlink:to="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-764d-bcec-7b37ec336ea2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d389-7d1e-9b58-1941e1645a47" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-764d-bcec-7b37ec336ea2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d389-7d1e-9b58-1941e1645a47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7d1e-9b58-1941e1645a47_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d389-7d1e-9b58-1941e1645a47" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7d1e-9b58-1941e1645a47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7e5e-9f1c-924324e3f5c1" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d389-7d1e-9b58-1941e1645a47" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7e5e-9f1c-924324e3f5c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_01a067ac-d389-713b-85aa-68aef4a5b645" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7e5e-9f1c-924324e3f5c1" xlink:to="loc_srt_ParentCompanyMember_01a067ac-d389-713b-85aa-68aef4a5b645" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NonGuarantorSubsidiariesMember_01a067ac-d389-7279-ac16-90c851a6072f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_NonGuarantorSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d389-7e5e-9f1c-924324e3f5c1" xlink:to="loc_srt_NonGuarantorSubsidiariesMember_01a067ac-d389-7279-ac16-90c851a6072f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-7304-8379-075cd687182c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-764d-bcec-7b37ec336ea2" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-7304-8379-075cd687182c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7304-8379-075cd687182c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-7304-8379-075cd687182c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7304-8379-075cd687182c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01a067ac-d389-7304-8379-075cd687182c" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_01a067ac-d389-73cf-bc30-d6eb0eafd6ed" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_SeniorNotesMember_01a067ac-d389-73cf-bc30-d6eb0eafd6ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_01a067ac-d389-7022-a1d5-667bd18254c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_SubordinatedDebtMember_01a067ac-d389-7022-a1d5-667bd18254c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesMember_01a067ac-d389-7a8f-b693-01df0f700e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FederalHomeLoanBankAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesMember_01a067ac-d389-7a8f-b693-01df0f700e3b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-7d23-a154-f3c834641002" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-7d23-a154-f3c834641002" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_01a067ac-d389-78f9-b193-652b0f5bb9d7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_SecuredDebtMember_01a067ac-d389-78f9-b193-652b0f5bb9d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_01a067ac-d389-71d1-9aae-1a41f6b6f81f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_01a067ac-d389-7ca7-bd88-9bf7c74745a7" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_01a067ac-d389-71d1-9aae-1a41f6b6f81f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7416-8d93-e56da6e668a5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_01a067ac-d389-764d-bcec-7b37ec336ea2" xlink:to="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7416-8d93-e56da6e668a5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7416-8d93-e56da6e668a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7416-8d93-e56da6e668a5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-7416-8d93-e56da6e668a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-775b-8145-56eefa1b1a8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_01a067ac-d389-7416-8d93-e56da6e668a5" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-775b-8145-56eefa1b1a8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HuntingtonNationalBankUnsecuredNotesMaturingMay202032Member_01a067ac-d389-79d7-943c-7c3005cf61c0" xlink:href="hban-20260930.xsd#hban_HuntingtonNationalBankUnsecuredNotesMaturingMay202032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_01a067ac-d389-775b-8145-56eefa1b1a8a" xlink:to="loc_hban_HuntingtonNationalBankUnsecuredNotesMaturingMay202032Member_01a067ac-d389-79d7-943c-7c3005cf61c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a067ac-d389-71ba-9c6e-e08a5fc8f598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7d38-a589-43d7112d7289" xlink:to="loc_us-gaap_LongTermDebt_01a067ac-d389-71ba-9c6e-e08a5fc8f598" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_01a067ac-d389-7001-903e-2cd135752566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_01a067ac-d389-7d38-a589-43d7112d7289" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_01a067ac-d389-7001-903e-2cd135752566" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/OTHERCOMPREHENSIVEINCOMEActivityRollForwardDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#OTHERCOMPREHENSIVEINCOMEActivityRollForwardDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/OTHERCOMPREHENSIVEINCOMEActivityRollForwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7bb1-a24b-b87b62270a79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7c6a-b05b-31e0c2d2b6b0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7bb1-a24b-b87b62270a79" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7c6a-b05b-31e0c2d2b6b0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7691-abc1-d103fe7eff24" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7c6a-b05b-31e0c2d2b6b0" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7691-abc1-d103fe7eff24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7691-abc1-d103fe7eff24_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7691-abc1-d103fe7eff24" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7691-abc1-d103fe7eff24_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c65-bfa9-d25f5dd72abe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7691-abc1-d103fe7eff24" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c65-bfa9-d25f5dd72abe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_01a067ac-d389-7bbf-baf6-41a30dc8877e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7c65-bfa9-d25f5dd72abe" xlink:to="loc_us-gaap_DebtSecuritiesMember_01a067ac-d389-7bbf-baf6-41a30dc8877e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7e8e-af9d-4b678793cc8a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7c6a-b05b-31e0c2d2b6b0" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7e8e-af9d-4b678793cc8a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7e8e-af9d-4b678793cc8a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7e8e-af9d-4b678793cc8a" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7e8e-af9d-4b678793cc8a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-71ca-8a6a-7946908c5e54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7e8e-af9d-4b678793cc8a" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-71ca-8a6a-7946908c5e54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a067ac-d389-71ca-8a6a-7946908c5e54" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_01a067ac-d389-7121-96e1-3f8c7eb049e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_01a067ac-d389-7121-96e1-3f8c7eb049e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_01a067ac-d389-79fe-828b-11473242acc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_01a067ac-d389-79fe-828b-11473242acc6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember_01a067ac-d389-7357-bbb3-2b763314b5bf" xlink:href="hban-20260930.xsd#hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:to="loc_hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember_01a067ac-d389-7357-bbb3-2b763314b5bf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_01a067ac-d389-719a-8637-38b88ecc4c07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7aa6-8e9c-f0a9ec6cf924" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_01a067ac-d389-719a-8637-38b88ecc4c07" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d389-7d3a-aea9-30027be85294" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7c6a-b05b-31e0c2d2b6b0" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d389-7d3a-aea9-30027be85294" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d389-7d3a-aea9-30027be85294_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d389-7d3a-aea9-30027be85294" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d389-7d3a-aea9-30027be85294_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d389-7ad3-b21b-54a7e5983375" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d389-7d3a-aea9-30027be85294" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d389-7ad3-b21b-54a7e5983375" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_01a067ac-d389-7d64-86d9-156b04ddbf53" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d389-7ad3-b21b-54a7e5983375" xlink:to="loc_us-gaap_CashFlowHedgingMember_01a067ac-d389-7d64-86d9-156b04ddbf53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-74e2-b270-5bf9aae02669" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7bb1-a24b-b87b62270a79" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-74e2-b270-5bf9aae02669" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_01a067ac-d389-7001-ad1e-b429e0aedf44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-74e2-b270-5bf9aae02669" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsBeforeTax_01a067ac-d389-7001-ad1e-b429e0aedf44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_01a067ac-d389-7675-a881-fb4461ef080e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-74e2-b270-5bf9aae02669" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodBeforeTax_01a067ac-d389-7675-a881-fb4461ef080e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_01a067ac-d389-74a3-97ff-307393a54808" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-74e2-b270-5bf9aae02669" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_01a067ac-d389-74a3-97ff-307393a54808" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_01a067ac-d389-72e5-b880-26e75c547037" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7bb1-a24b-b87b62270a79" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_01a067ac-d389-72e5-b880-26e75c547037" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_01a067ac-d389-7d3f-8243-1818755c5a9d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_01a067ac-d389-72e5-b880-26e75c547037" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_01a067ac-d389-7d3f-8243-1818755c5a9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_01a067ac-d389-7ff9-9371-3098d9e1a4f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_01a067ac-d389-72e5-b880-26e75c547037" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_01a067ac-d389-7ff9-9371-3098d9e1a4f6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_01a067ac-d389-708c-b0d2-068037a9fbc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossTaxAbstract_01a067ac-d389-72e5-b880-26e75c547037" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_01a067ac-d389-708c-b0d2-068037a9fbc9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-7e87-9e27-07309e05ecba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7bb1-a24b-b87b62270a79" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-7e87-9e27-07309e05ecba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_01a067ac-d389-7156-b0d8-01c19c7c6ed5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-7e87-9e27-07309e05ecba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_01a067ac-d389-7156-b0d8-01c19c7c6ed5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_01a067ac-d389-7a16-b229-18a73b2ff679" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-7e87-9e27-07309e05ecba" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_01a067ac-d389-7a16-b229-18a73b2ff679" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d389-7586-8665-4bac5da5b3b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_01a067ac-d389-7e87-9e27-07309e05ecba" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d389-7586-8665-4bac5da5b3b7" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/OTHERCOMPREHENSIVEINCOMEAOCIRollForwardDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#OTHERCOMPREHENSIVEINCOMEAOCIRollForwardDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/OTHERCOMPREHENSIVEINCOMEAOCIRollForwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7c31-8e51-1f9f9030f35f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7869-8fd2-54e37bff119a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7c31-8e51-1f9f9030f35f" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7869-8fd2-54e37bff119a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7150-a5b9-62cfaede15ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7869-8fd2-54e37bff119a" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7150-a5b9-62cfaede15ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7150-a5b9-62cfaede15ac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7150-a5b9-62cfaede15ac" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7150-a5b9-62cfaede15ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-73fb-afc7-11b3c0b7a314" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7150-a5b9-62cfaede15ac" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-73fb-afc7-11b3c0b7a314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a067ac-d389-73fb-afc7-11b3c0b7a314" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_01a067ac-d389-7e24-8a0c-5545bcbffccf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_01a067ac-d389-7e24-8a0c-5545bcbffccf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_01a067ac-d389-70e1-a032-c91b576fc1f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_01a067ac-d389-70e1-a032-c91b576fc1f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember_01a067ac-d389-7c86-844f-9332b8db4222" xlink:href="hban-20260930.xsd#hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:to="loc_hban_AccumulatedForeignCurrencyAdjustmentNetOfInvestmentHedgesAttributableToParentMember_01a067ac-d389-7c86-844f-9332b8db4222" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_01a067ac-d389-7419-a2d9-e97c64df613d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7132-9008-01e596c7614f" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_01a067ac-d389-7419-a2d9-e97c64df613d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_01a067ac-d389-76cd-a3c7-3ceb7d70427e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_01a067ac-d389-7869-8fd2-54e37bff119a" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_01a067ac-d389-76cd-a3c7-3ceb7d70427e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_01a067ac-d389-76cd-a3c7-3ceb7d70427e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_01a067ac-d389-76cd-a3c7-3ceb7d70427e" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_01a067ac-d389-76cd-a3c7-3ceb7d70427e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_01a067ac-d389-7e3e-95b2-b650d9020214" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_01a067ac-d389-76cd-a3c7-3ceb7d70427e" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_01a067ac-d389-7e3e-95b2-b650d9020214" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7d1e-aba5-6da4e8327295" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_01a067ac-d389-7e3e-95b2-b650d9020214" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_01a067ac-d389-7d1e-aba5-6da4e8327295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_01a067ac-d389-7c31-8e51-1f9f9030f35f" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d389-74b9-8f11-bb04dd0b46a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d389-74b9-8f11-bb04dd0b46a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_01a067ac-d389-7372-b28c-ec50757e4bcf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax_01a067ac-d389-7372-b28c-ec50757e4bcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_01a067ac-d389-7ff0-9626-833d9ea8c6b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_01a067ac-d389-7ff0-9626-833d9ea8c6b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d389-7255-a1e1-e2e142c6ee55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_01a067ac-d389-7255-a1e1-e2e142c6ee55" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_01a067ac-d389-7387-8fd3-31aa24f4331e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OCIDebtSecuritiesHeldToMaturityTransferFromAvailableForSaleGainLossBeforeAdjustmentAfterTax_01a067ac-d389-729f-97b0-0d22d55ab46f" xlink:href="hban-20260930.xsd#hban_OCIDebtSecuritiesHeldToMaturityTransferFromAvailableForSaleGainLossBeforeAdjustmentAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_01a067ac-d389-7ff9-a7af-21882a204cf6" xlink:to="loc_hban_OCIDebtSecuritiesHeldToMaturityTransferFromAvailableForSaleGainLossBeforeAdjustmentAfterTax_01a067ac-d389-729f-97b0-0d22d55ab46f" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/SHAREHOLDERSEQUITYDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#SHAREHOLDERSEQUITYDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/SHAREHOLDERSEQUITYDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_01a067ac-d389-7d22-a645-648ffdff9459" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_01a067ac-d389-7d22-a645-648ffdff9459" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d389-755b-8702-c0523e1310f3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_01a067ac-d389-7d22-a645-648ffdff9459" xlink:to="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d389-755b-8702-c0523e1310f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-755b-8702-c0523e1310f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d389-755b-8702-c0523e1310f3" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-755b-8702-c0523e1310f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_01a067ac-d389-755b-8702-c0523e1310f3" xlink:to="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_01a067ac-d389-78ed-9290-a4e1fb100701" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesBPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_01a067ac-d389-78ed-9290-a4e1fb100701" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesFPreferredStockMember_01a067ac-d389-7267-85b6-ccbb2431fa14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesFPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_us-gaap_SeriesFPreferredStockMember_01a067ac-d389-7267-85b6-ccbb2431fa14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesGPreferredStockMember_01a067ac-d389-7d90-8920-723a51427751" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesGPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_us-gaap_SeriesGPreferredStockMember_01a067ac-d389-7d90-8920-723a51427751" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesHPreferredStockMember_01a067ac-d389-7c47-bf66-5a7b1230953f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SeriesHPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_us-gaap_SeriesHPreferredStockMember_01a067ac-d389-7c47-bf66-5a7b1230953f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesIPreferredStockMember_01a067ac-d389-74bf-8daf-504f7249a042" xlink:href="hban-20260930.xsd#hban_SeriesIPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesIPreferredStockMember_01a067ac-d389-74bf-8daf-504f7249a042" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesJPreferredStockMember_01a067ac-d389-7adf-8c25-07cd1af7654f" xlink:href="hban-20260930.xsd#hban_SeriesJPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesJPreferredStockMember_01a067ac-d389-7adf-8c25-07cd1af7654f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesKPreferredStockMember_01a067ac-d389-7703-ac8c-90b08ba8f96a" xlink:href="hban-20260930.xsd#hban_SeriesKPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesKPreferredStockMember_01a067ac-d389-7703-ac8c-90b08ba8f96a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesLPreferredStockMember_01a067ac-d389-7a51-b58e-9982080fd14c" xlink:href="hban-20260930.xsd#hban_SeriesLPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesLPreferredStockMember_01a067ac-d389-7a51-b58e-9982080fd14c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesBHAndJPreferredStockMember_01a067ac-d389-7efe-9bc2-2574bf3762ef" xlink:href="hban-20260930.xsd#hban_SeriesBHAndJPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesBHAndJPreferredStockMember_01a067ac-d389-7efe-9bc2-2574bf3762ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SeriesFAndGPreferredStockMember_01a067ac-d389-76a6-af09-548af8780c61" xlink:href="hban-20260930.xsd#hban_SeriesFAndGPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_01a067ac-d389-7917-9b41-a69d95869cd2" xlink:to="loc_hban_SeriesFAndGPreferredStockMember_01a067ac-d389-76a6-af09-548af8780c61" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7bb0-bca3-d390f9166874" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_01a067ac-d389-7d22-a645-648ffdff9459" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7bb0-bca3-d390f9166874" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7bb0-bca3-d390f9166874_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7bb0-bca3-d390f9166874" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7bb0-bca3-d390f9166874_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7faf-86d7-254d68a5a176" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_01a067ac-d389-7bb0-bca3-d390f9166874" xlink:to="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7faf-86d7-254d68a5a176" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_01a067ac-d389-73a1-ba9e-6f61820e044b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_01a067ac-d389-7faf-86d7-254d68a5a176" xlink:to="loc_us-gaap_RetainedEarningsMember_01a067ac-d389-73a1-ba9e-6f61820e044b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_01a067ac-d389-749c-9a1d-0ce6c43e9139" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_01a067ac-d389-749c-9a1d-0ce6c43e9139" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_01a067ac-d389-7bb1-91df-0142608d3948" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_01a067ac-d389-7bb1-91df-0142608d3948" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValueOutstanding_01a067ac-d389-7745-98dd-94795c0aaeb2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_PreferredStockValueOutstanding_01a067ac-d389-7745-98dd-94795c0aaeb2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_01a067ac-d389-72e7-be03-b403f7f4c90b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_01a067ac-d389-72e7-be03-b403f7f4c90b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentVariableInterestRateTypeExtensibleEnumeration_01a067ac-d389-7782-acaa-11213f8dabe0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentVariableInterestRateTypeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_InvestmentVariableInterestRateTypeExtensibleEnumeration_01a067ac-d389-7782-acaa-11213f8dabe0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_PreferredStockBasisSpreadAdjustmentOnVariableRate_01a067ac-d389-7878-95c3-6ca2132e1764" xlink:href="hban-20260930.xsd#hban_PreferredStockBasisSpreadAdjustmentOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_hban_PreferredStockBasisSpreadAdjustmentOnVariableRate_01a067ac-d389-7878-95c3-6ca2132e1764" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_PreferredStockBasisSpreadOnVariableRate_01a067ac-d389-75e7-9edb-ab8fd2b48960" xlink:href="hban-20260930.xsd#hban_PreferredStockBasisSpreadOnVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_hban_PreferredStockBasisSpreadOnVariableRate_01a067ac-d389-75e7-9edb-ab8fd2b48960" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_01a067ac-d389-74de-bc7a-519ee99998bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_01a067ac-d389-74de-bc7a-519ee99998bf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_01a067ac-d389-72ce-a2aa-3be681179dad" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_01a067ac-d389-70f3-8d6d-66218aa4b85b" xlink:to="loc_us-gaap_DividendsPreferredStockCash_01a067ac-d389-72ce-a2aa-3be681179dad" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/EARNINGSPERSHAREDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#EARNINGSPERSHAREDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/EARNINGSPERSHAREDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a067ac-d389-7e0f-9c19-8ca3b0d17715" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a067ac-d389-7b4d-be5a-34f17ae73a3c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a067ac-d389-7e0f-9c19-8ca3b0d17715" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a067ac-d389-7b4d-be5a-34f17ae73a3c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_01a067ac-d389-7e5b-a9b9-77702294c638" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_01a067ac-d389-7b4d-be5a-34f17ae73a3c" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_01a067ac-d389-7e5b-a9b9-77702294c638" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01a067ac-d389-7e5b-a9b9-77702294c638_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_01a067ac-d389-7e5b-a9b9-77702294c638" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01a067ac-d389-7e5b-a9b9-77702294c638_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01a067ac-d389-735e-bfcb-7adb94a40baf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_01a067ac-d389-7e5b-a9b9-77702294c638" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01a067ac-d389-735e-bfcb-7adb94a40baf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_01a067ac-d389-79fa-aea7-d4ef3fdbf375" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_01a067ac-d389-735e-bfcb-7adb94a40baf" xlink:to="loc_us-gaap_EmployeeStockOptionMember_01a067ac-d389-79fa-aea7-d4ef3fdbf375" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_01a067ac-d389-75ed-8bd0-f78156f4ef56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_01a067ac-d389-7e0f-9c19-8ca3b0d17715" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_01a067ac-d389-75ed-8bd0-f78156f4ef56" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSDisaggregationbySegmentDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#REVENUEFROMCONTRACTSWITHCUSTOMERSDisaggregationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/REVENUEFROMCONTRACTSWITHCUSTOMERSDisaggregationbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_01a067ac-d389-7701-8d36-7a1f028f9a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_01a067ac-d389-7c63-bd6b-99bb5b0bf545" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a067ac-d389-7701-8d36-7a1f028f9a0d" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_01a067ac-d389-7c63-bd6b-99bb5b0bf545" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_01a067ac-d389-71e9-b4ab-99bf454cd1c4" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a067ac-d389-7c63-bd6b-99bb5b0bf545" xlink:to="loc_srt_ConsolidationItemsAxis_01a067ac-d389-71e9-b4ab-99bf454cd1c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d389-71e9-b4ab-99bf454cd1c4_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d389-71e9-b4ab-99bf454cd1c4" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d389-71e9-b4ab-99bf454cd1c4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d389-793b-81b3-80b36543646c" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d389-71e9-b4ab-99bf454cd1c4" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d389-793b-81b3-80b36543646c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_01a067ac-d389-7e15-bfa2-2c8371a87239" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a067ac-d389-793b-81b3-80b36543646c" xlink:to="loc_us-gaap_OperatingSegmentsMember_01a067ac-d389-7e15-bfa2-2c8371a87239" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_01a067ac-d389-7451-b00a-82926b766dee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a067ac-d389-793b-81b3-80b36543646c" xlink:to="loc_us-gaap_CorporateNonSegmentMember_01a067ac-d389-7451-b00a-82926b766dee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-7e8c-89c4-570b748792bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a067ac-d389-7c63-bd6b-99bb5b0bf545" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-7e8c-89c4-570b748792bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d389-7e8c-89c4-570b748792bd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-7e8c-89c4-570b748792bd" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d389-7e8c-89c4-570b748792bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d389-763f-9f5c-5f8840124d41" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d389-7e8c-89c4-570b748792bd" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d389-763f-9f5c-5f8840124d41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d389-7f95-8b66-a3bb196d465c" xlink:href="hban-20260930.xsd#hban_ConsumerAndBusinessBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d389-763f-9f5c-5f8840124d41" xlink:to="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d389-7f95-8b66-a3bb196d465c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialBankingMember_01a067ac-d389-7f46-8125-c5f70078291d" xlink:href="hban-20260930.xsd#hban_CommercialBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d389-763f-9f5c-5f8840124d41" xlink:to="loc_hban_CommercialBankingMember_01a067ac-d389-7f46-8125-c5f70078291d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d389-73f5-ac0d-84cda2010e39" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_01a067ac-d389-7c63-bd6b-99bb5b0bf545" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d389-73f5-ac0d-84cda2010e39" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-73f5-ac0d-84cda2010e39_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-73f5-ac0d-84cda2010e39" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-73f5-ac0d-84cda2010e39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-73f5-ac0d-84cda2010e39" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CardsAndPaymentProcessingRevenueMember_01a067ac-d389-7144-b82f-b4e05c387f80" xlink:href="hban-20260930.xsd#hban_CardsAndPaymentProcessingRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:to="loc_hban_CardsAndPaymentProcessingRevenueMember_01a067ac-d389-7144-b82f-b4e05c387f80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_TrustAndInvestmentManagementServicesRevenueMember_01a067ac-d389-7f63-a5f7-cf2ba9d66079" xlink:href="hban-20260930.xsd#hban_TrustAndInvestmentManagementServicesRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:to="loc_hban_TrustAndInvestmentManagementServicesRevenueMember_01a067ac-d389-7f63-a5f7-cf2ba9d66079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ServiceChargesRevenueMember_01a067ac-d389-716c-9396-7b514af13cee" xlink:href="hban-20260930.xsd#hban_ServiceChargesRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:to="loc_hban_ServiceChargesRevenueMember_01a067ac-d389-716c-9396-7b514af13cee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CapitalMarketFeesMember_01a067ac-d389-7e98-9afb-f03ca7b6e407" xlink:href="hban-20260930.xsd#hban_CapitalMarketFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:to="loc_hban_CapitalMarketFeesMember_01a067ac-d389-7e98-9afb-f03ca7b6e407" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherRevenueMember_01a067ac-d389-7f6e-9ada-40e2823254bc" xlink:href="hban-20260930.xsd#hban_OtherRevenueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7668-a513-dd439fc227f2" xlink:to="loc_hban_OtherRevenueMember_01a067ac-d389-7f6e-9ada-40e2823254bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a067ac-d389-7ccb-944b-90cd40c2cbb5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a067ac-d389-7701-8d36-7a1f028f9a0d" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_01a067ac-d389-7ccb-944b-90cd40c2cbb5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueNotFromContractWithCustomer_01a067ac-d389-775e-8acb-e84049add6b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenueNotFromContractWithCustomer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a067ac-d389-7701-8d36-7a1f028f9a0d" xlink:to="loc_us-gaap_RevenueNotFromContractWithCustomer_01a067ac-d389-775e-8acb-e84049add6b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_01a067ac-d389-7601-a39e-ea621786936b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_01a067ac-d389-7701-8d36-7a1f028f9a0d" xlink:to="loc_us-gaap_NoninterestIncome_01a067ac-d389-7601-a39e-ea621786936b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESRecurringBasisDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d389-7027-8dc2-3edd1a5f8839" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-7ab1-8ab8-6448cbd9be85" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d389-7027-8dc2-3edd1a5f8839" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-7ab1-8ab8-6448cbd9be85" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-7505-b9d9-c20927745109" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-7ab1-8ab8-6448cbd9be85" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-7505-b9d9-c20927745109" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-7505-b9d9-c20927745109_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-7505-b9d9-c20927745109" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-7505-b9d9-c20927745109_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-72c0-a8d2-9868b40f1ae0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-7505-b9d9-c20927745109" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-72c0-a8d2-9868b40f1ae0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_01a067ac-d389-77b3-b7e6-eb195ca02a56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-72c0-a8d2-9868b40f1ae0" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_01a067ac-d389-77b3-b7e6-eb195ca02a56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_01a067ac-d389-7f14-9925-7e64f9e931ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-72c0-a8d2-9868b40f1ae0" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_01a067ac-d389-7f14-9925-7e64f9e931ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d389-7a32-8eee-16d363c77697" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-72c0-a8d2-9868b40f1ae0" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d389-7a32-8eee-16d363c77697" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7782-b51c-76d31b598f44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-7ab1-8ab8-6448cbd9be85" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7782-b51c-76d31b598f44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7782-b51c-76d31b598f44_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7782-b51c-76d31b598f44" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7782-b51c-76d31b598f44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7782-b51c-76d31b598f44" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d389-7b23-9aa8-4c21721c3854" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_USTreasurySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_USTreasurySecuritiesMember_01a067ac-d389-7b23-9aa8-4c21721c3854" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d389-73c7-88d5-a203043d337b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d389-73c7-88d5-a203043d337b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_01a067ac-d389-7761-b144-950e4d354504" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_01a067ac-d389-7761-b144-950e4d354504" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d389-7baa-a605-35c0b1301b5d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_01a067ac-d389-7baa-a605-35c0b1301b5d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherFederalAgenciesMember_01a067ac-d389-752b-abe1-2a2a4cd3acf9" xlink:href="hban-20260930.xsd#hban_OtherFederalAgenciesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_hban_OtherFederalAgenciesMember_01a067ac-d389-752b-abe1-2a2a4cd3acf9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-7c67-954d-2ffaa3c20de3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-7c67-954d-2ffaa3c20de3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d389-7ba9-a88e-6973239a2d38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d389-7ba9-a88e-6973239a2d38" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-7df9-9180-9066f2dc7b81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-7df9-9180-9066f2dc7b81" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-76f7-b20b-59334b0018cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-76f7-b20b-59334b0018cd" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_01a067ac-d389-707e-8df4-02ceb3625366" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-74da-a648-ff2cc6851e6b" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_01a067ac-d389-707e-8df4-02ceb3625366" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d389-7027-8dc2-3edd1a5f8839" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecuritiesDebt_01a067ac-d389-7828-a529-a1cae8098934" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecuritiesDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_TradingSecuritiesDebt_01a067ac-d389-7828-a529-a1cae8098934" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d389-7596-81d3-57147d04ac7a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d389-7596-81d3-57147d04ac7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherSecuritiesFairValue_01a067ac-d389-79ed-89d9-f76d11880f04" xlink:href="hban-20260930.xsd#hban_OtherSecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_hban_OtherSecuritiesFairValue_01a067ac-d389-79ed-89d9-f76d11880f04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_01a067ac-d389-7bd2-82b5-a93821951ba8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_01a067ac-d389-7bd2-82b5-a93821951ba8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-775d-a7cf-8e0346622f08" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-775d-a7cf-8e0346622f08" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetAtFairValueAmount_01a067ac-d389-7e02-8ee9-071191107f89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetAtFairValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_ServicingAssetAtFairValueAmount_01a067ac-d389-7e02-8ee9-071191107f89" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d389-7b7a-bef8-ee385004a001" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d389-7b7a-bef8-ee385004a001" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_01a067ac-d389-77f0-a81e-b7cfc76847ae" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_01a067ac-d389-77f0-a81e-b7cfc76847ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_01a067ac-d389-795e-b6b7-8aeda1d8d7b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_us-gaap_DerivativeAssets_01a067ac-d389-795e-b6b7-8aeda1d8d7b8" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_RestrictedAssetsFairValueDisclosure_01a067ac-d389-717c-a29e-5fca09ad33e0" xlink:href="hban-20260930.xsd#hban_RestrictedAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_01a067ac-d389-7223-943d-e04d2e684c8d" xlink:to="loc_hban_RestrictedAssetsFairValueDisclosure_01a067ac-d389-717c-a29e-5fca09ad33e0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d389-7027-8dc2-3edd1a5f8839" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShorttermDebtFairValue_01a067ac-d389-7ad3-9ded-4762ba6afbc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShorttermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:to="loc_us-gaap_ShorttermDebtFairValue_01a067ac-d389-7ad3-9ded-4762ba6afbc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_01a067ac-d389-7b66-aa8f-46af6c5863be" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:to="loc_us-gaap_LongTermDebtFairValue_01a067ac-d389-7b66-aa8f-46af6c5863be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d389-78c7-9299-656cfc3ad409" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d389-78c7-9299-656cfc3ad409" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_01a067ac-d389-7684-bd3b-360c0e062e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_01a067ac-d389-7684-bd3b-360c0e062e7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_01a067ac-d389-7c93-af0a-4ce48ff437a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_01a067ac-d389-74f6-bcc9-10f40badd13a" xlink:to="loc_us-gaap_DerivativeLiabilities_01a067ac-d389-7c93-af0a-4ce48ff437a0" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-70c6-9901-36bd18867cc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-70c6-9901-36bd18867cc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageServicingRightsMember_01a067ac-d389-727c-818e-df9ea98dbfe2" xlink:href="hban-20260930.xsd#hban_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_hban_MortgageServicingRightsMember_01a067ac-d389-727c-818e-df9ea98dbfe2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-714f-a0bc-d8c10dfc644d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-714f-a0bc-d8c10dfc644d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-7daa-8d64-754019d11fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-7daa-8d64-754019d11fa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-757c-8299-330aba5d8946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-757c-8299-330aba5d8946" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LoansHeldForInvestmentMember_01a067ac-d389-7b0a-902e-42cb89a5e7bc" xlink:href="hban-20260930.xsd#hban_LoansHeldForInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_hban_LoansHeldForInvestmentMember_01a067ac-d389-7b0a-902e-42cb89a5e7bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d389-7a6d-93d4-dc5cc320ef38" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d389-7a6d-93d4-dc5cc320ef38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7fad-ac27-54b5960e0b89_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7fad-ac27-54b5960e0b89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d389-7d20-8287-9ab6067a1161" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:to="loc_hban_CadenceBankMember_01a067ac-d389-7d20-8287-9ab6067a1161" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7314-b57e-3c776f39cb37_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7314-b57e-3c776f39cb37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageBankingIncomeMember_01a067ac-d389-76bd-8ff5-885aa6b933c7" xlink:href="hban-20260930.xsd#hban_MortgageBankingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:to="loc_hban_MortgageBankingIncomeMember_01a067ac-d389-76bd-8ff5-885aa6b933c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeMember_01a067ac-d389-7a6f-b46c-802d139706c6" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:to="loc_hban_OtherNoninterestIncomeMember_01a067ac-d389-7a6f-b46c-802d139706c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-7fc6-84ab-0c2320c19422" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-7fc6-84ab-0c2320c19422" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_01a067ac-d389-7a88-8d28-8b6925af6d75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_01a067ac-d389-7a88-8d28-8b6925af6d75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_01a067ac-d389-76e6-a9f0-e12a40716f49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_01a067ac-d389-76e6-a9f0-e12a40716f49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:href="hban-20260930.xsd#hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_01a067ac-d389-7ad9-a707-0c017b7483bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_01a067ac-d389-7ad9-a707-0c017b7483bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-710c-b214-2a5c4a718dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-710c-b214-2a5c4a718dd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_01a067ac-d389-7270-a5f9-a65d6c3bbdf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_01a067ac-d389-7270-a5f9-a65d6c3bbdf6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments_01a067ac-d389-78f4-bc6a-a12b3cc0c978" xlink:href="hban-20260930.xsd#hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments_01a067ac-d389-78f4-bc6a-a12b3cc0c978" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_01a067ac-d389-75e8-a6bb-e40cce1bffb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_01a067ac-d389-75e8-a6bb-e40cce1bffb9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-761f-8069-135873fee297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-7cbc-8be1-0501065129ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-7cbc-8be1-0501065129ce" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7860-afa6-3d0c1a7a6e94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7860-afa6-3d0c1a7a6e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3_01a067ac-d389-7f8f-b122-a1c4c9628c00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3_01a067ac-d389-7f8f-b122-a1c4c9628c00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3_01a067ac-d389-7c62-9d59-8be470402d04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3_01a067ac-d389-7c62-9d59-8be470402d04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_01a067ac-d389-755b-adbd-ce51110c7453" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_01a067ac-d389-755b-adbd-ce51110c7453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-77d9-9877-887835cc1d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-77d9-9877-887835cc1d98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases_01a067ac-d389-7d07-9bbb-6c3e9d89f442" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases_01a067ac-d389-7d07-9bbb-6c3e9d89f442" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments_01a067ac-d389-7415-aee4-bdae0cf41666" xlink:href="hban-20260930.xsd#hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments_01a067ac-d389-7415-aee4-bdae0cf41666" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_01a067ac-d389-7162-9ffe-d05e2cbc1b34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_01a067ac-d389-7162-9ffe-d05e2cbc1b34" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7128-85f8-62f88416d66e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-720b-8d88-3eca54d6c460" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-720b-8d88-3eca54d6c460" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails_1" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails_1"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESLevel3RollForwardDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-70c6-9901-36bd18867cc0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-70c6-9901-36bd18867cc0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_01a067ac-d389-70c6-9901-36bd18867cc0" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageServicingRightsMember_01a067ac-d389-727c-818e-df9ea98dbfe2" xlink:href="hban-20260930.xsd#hban_MortgageServicingRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_hban_MortgageServicingRightsMember_01a067ac-d389-727c-818e-df9ea98dbfe2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-714f-a0bc-d8c10dfc644d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MunicipalBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_MunicipalBondsMember_01a067ac-d389-714f-a0bc-d8c10dfc644d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-7daa-8d64-754019d11fa6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember_01a067ac-d389-7daa-8d64-754019d11fa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-757c-8299-330aba5d8946" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_01a067ac-d389-757c-8299-330aba5d8946" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LoansHeldForInvestmentMember_01a067ac-d389-7b0a-902e-42cb89a5e7bc" xlink:href="hban-20260930.xsd#hban_LoansHeldForInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_01a067ac-d389-73d8-b2e6-809d1f132724" xlink:to="loc_hban_LoansHeldForInvestmentMember_01a067ac-d389-7b0a-902e-42cb89a5e7bc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7fad-ac27-54b5960e0b89_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7fad-ac27-54b5960e0b89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_01a067ac-d389-7fad-ac27-54b5960e0b89" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d389-7d20-8287-9ab6067a1161" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_01a067ac-d389-7430-8a37-fd7f5199a362" xlink:to="loc_hban_CadenceBankMember_01a067ac-d389-7d20-8287-9ab6067a1161" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_01a067ac-d389-7adc-97f4-b158f32b8420" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7314-b57e-3c776f39cb37_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-7314-b57e-3c776f39cb37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d389-7314-b57e-3c776f39cb37" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageBankingIncomeMember_01a067ac-d389-76bd-8ff5-885aa6b933c7" xlink:href="hban-20260930.xsd#hban_MortgageBankingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:to="loc_hban_MortgageBankingIncomeMember_01a067ac-d389-76bd-8ff5-885aa6b933c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeMember_01a067ac-d389-7a6f-b46c-802d139706c6" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d389-74ca-952c-e017bf087dd3" xlink:to="loc_hban_OtherNoninterestIncomeMember_01a067ac-d389-7a6f-b46c-802d139706c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-7fc6-84ab-0c2320c19422" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-7fc6-84ab-0c2320c19422" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_01a067ac-d389-7a88-8d28-8b6925af6d75" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3_01a067ac-d389-7a88-8d28-8b6925af6d75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_01a067ac-d389-76e6-a9f0-e12a40716f49" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3_01a067ac-d389-76e6-a9f0-e12a40716f49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:href="hban-20260930.xsd#hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_01a067ac-d389-7ad9-a707-0c017b7483bd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_01a067ac-d389-7b05-8129-6009b22dbfd7" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_01a067ac-d389-7ad9-a707-0c017b7483bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-710c-b214-2a5c4a718dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_FairValueAssetsLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForwardAbstract_01a067ac-d389-7f5f-bd9c-26864d34fd0a" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-710c-b214-2a5c4a718dd4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_01a067ac-d389-7270-a5f9-a65d6c3bbdf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_01a067ac-d389-7270-a5f9-a65d6c3bbdf6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments_01a067ac-d389-78f4-bc6a-a12b3cc0c978" xlink:href="hban-20260930.xsd#hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_hban_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetRepayments_01a067ac-d389-78f4-bc6a-a12b3cc0c978" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_01a067ac-d389-75e8-a6bb-e40cce1bffb9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_01a067ac-d389-75e8-a6bb-e40cce1bffb9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_01a067ac-d389-761f-8069-135873fee297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-7cbc-8be1-0501065129ce" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_01a067ac-d389-7bf4-8691-799afd3a5229" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-7cbc-8be1-0501065129ce" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7860-afa6-3d0c1a7a6e94" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7860-afa6-3d0c1a7a6e94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3_01a067ac-d389-7f8f-b122-a1c4c9628c00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersIntoLevel3_01a067ac-d389-7f8f-b122-a1c4c9628c00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3_01a067ac-d389-7c62-9d59-8be470402d04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationTransfersOutOfLevel3_01a067ac-d389-7c62-9d59-8be470402d04" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_01a067ac-d389-755b-adbd-ce51110c7453" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings_01a067ac-d389-7421-8ca1-d26e10646e92" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationNetDerivativeAssetLiabilityGainLossStatementOfIncomeExtensibleList_01a067ac-d389-755b-adbd-ce51110c7453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-77d9-9877-887835cc1d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss_01a067ac-d389-77d9-9877-887835cc1d98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases_01a067ac-d389-7d07-9bbb-6c3e9d89f442" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases_01a067ac-d389-7d07-9bbb-6c3e9d89f442" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments_01a067ac-d389-7415-aee4-bdae0cf41666" xlink:href="hban-20260930.xsd#hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_hban_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationRepayments_01a067ac-d389-7415-aee4-bdae0cf41666" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_01a067ac-d389-7162-9ffe-d05e2cbc1b34" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputReconciliationRollForward_01a067ac-d389-7332-a8df-c208edfbc29b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements_01a067ac-d389-7162-9ffe-d05e2cbc1b34" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs_01a067ac-d389-7128-85f8-62f88416d66e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-720b-8d88-3eca54d6c460" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_01a067ac-d389-7971-8812-45e29902ee5b" xlink:to="loc_us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_01a067ac-d389-720b-8d88-3eca54d6c460" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-7f24-9eab-abc4a2cee6e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-7f24-9eab-abc4a2cee6e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7fcf-a5eb-12747bd49a93" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-7f24-9eab-abc4a2cee6e4" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7fcf-a5eb-12747bd49a93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7fcf-a5eb-12747bd49a93_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7fcf-a5eb-12747bd49a93" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7fcf-a5eb-12747bd49a93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7e75-83f9-9a884fae641f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_01a067ac-d389-7fcf-a5eb-12747bd49a93" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7e75-83f9-9a884fae641f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7fef-9f60-2e3f9e2c6bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_01a067ac-d389-7e75-83f9-9a884fae641f" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_01a067ac-d389-7fef-9f60-2e3f9e2c6bd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7413-a123-e25598b3cfe1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-7f24-9eab-abc4a2cee6e4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7413-a123-e25598b3cfe1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7413-a123-e25598b3cfe1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7413-a123-e25598b3cfe1" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7413-a123-e25598b3cfe1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-76cf-a724-336b34ba1241" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7413-a123-e25598b3cfe1" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-76cf-a724-336b34ba1241" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldForSaleMember_01a067ac-d389-7881-bb54-50832b28d722" xlink:href="hban-20260930.xsd#hban_MortgagesHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-76cf-a724-336b34ba1241" xlink:to="loc_hban_MortgagesHeldForSaleMember_01a067ac-d389-7881-bb54-50832b28d722" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldToMaturityMember_01a067ac-d389-72e2-a97a-c5a8fc7d9abe" xlink:href="hban-20260930.xsd#hban_MortgagesHeldToMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-76cf-a724-336b34ba1241" xlink:to="loc_hban_MortgagesHeldToMaturityMember_01a067ac-d389-72e2-a97a-c5a8fc7d9abe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_01a067ac-d389-7332-89aa-186a4ee27094" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_01a067ac-d389-7332-89aa-186a4ee27094" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldForSaleUnpaidPrincipal_01a067ac-d389-72d4-99db-77426ddfa801" xlink:href="hban-20260930.xsd#hban_MortgagesHeldForSaleUnpaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_hban_MortgagesHeldForSaleUnpaidPrincipal_01a067ac-d389-72d4-99db-77426ddfa801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-726a-a12d-957c399ca29c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_01a067ac-d389-726a-a12d-957c399ca29c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldToMaturityUnpaidPrincipal_01a067ac-d389-775f-baea-c774a11c5294" xlink:href="hban-20260930.xsd#hban_MortgagesHeldToMaturityUnpaidPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_hban_MortgagesHeldToMaturityUnpaidPrincipal_01a067ac-d389-775f-baea-c774a11c5294" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_01a067ac-d389-724e-878c-f026191486a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_FairValueOptionAggregateDifferencesLoansAndLongTermReceivables_01a067ac-d389-724e-878c-f026191486a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_01a067ac-d389-77c3-a50b-8842966491da" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_LongTermDebtFairValue_01a067ac-d389-77c3-a50b-8842966491da" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_01a067ac-d389-707b-9ce0-c7a1dcee3782" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_01a067ac-d389-707b-9ce0-c7a1dcee3782" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments_01a067ac-d389-79f7-963f-29c4e8ed9504" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-7ca2-b224-85f278275e80" xlink:to="loc_us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments_01a067ac-d389-79f7-963f-29c4e8ed9504" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionChangesinFairValueDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionChangesinFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESFairValueOptionChangesinFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-746c-a45c-907f4f7484f8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-781a-b6e1-88c2b308ca4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionQuantitativeDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-746c-a45c-907f4f7484f8" xlink:to="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-781a-b6e1-88c2b308ca4a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresTable_01a067ac-d389-781a-b6e1-88c2b308ca4a" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7d01-9607-6b953ba32e47" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d389-7cf6-b8aa-0cb43a5b9c42" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7d01-9607-6b953ba32e47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldForSaleMember_01a067ac-d389-775d-883f-3b5a4b30ab3f" xlink:href="hban-20260930.xsd#hban_MortgagesHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7d01-9607-6b953ba32e47" xlink:to="loc_hban_MortgagesHeldForSaleMember_01a067ac-d389-775d-883f-3b5a4b30ab3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgagesHeldToMaturityMember_01a067ac-d389-7483-97f7-6150f8088fb4" xlink:href="hban-20260930.xsd#hban_MortgagesHeldToMaturityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7d01-9607-6b953ba32e47" xlink:to="loc_hban_MortgagesHeldToMaturityMember_01a067ac-d389-7483-97f7-6150f8088fb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-71ea-b162-67f5d10809f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d389-7d01-9607-6b953ba32e47" xlink:to="loc_us-gaap_UnsecuredDebtMember_01a067ac-d389-71ea-b162-67f5d10809f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_01a067ac-d389-7601-aea7-ec9dee108eef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOptionChangesInFairValueGainLoss1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOptionQuantitativeDisclosuresLineItems_01a067ac-d389-746c-a45c-907f4f7484f8" xlink:to="loc_us-gaap_FairValueOptionChangesInFairValueGainLoss1_01a067ac-d389-7601-aea7-ec9dee108eef" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESNonRecurringBasisDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESNonRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESNonRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d42d-728e-b7f1-5cbee761d43d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-73b9-8b12-dbd4b73bf0bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d42d-728e-b7f1-5cbee761d43d" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-73b9-8b12-dbd4b73bf0bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_01a067ac-d389-7e44-b062-2188fcf8c8bc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-73b9-8b12-dbd4b73bf0bc" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_01a067ac-d389-7e44-b062-2188fcf8c8bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_01a067ac-d389-7e44-b062-2188fcf8c8bc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_01a067ac-d389-7e44-b062-2188fcf8c8bc" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_01a067ac-d389-7e44-b062-2188fcf8c8bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_01a067ac-d389-7963-a04c-4e69a8b3e7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_01a067ac-d389-7e44-b062-2188fcf8c8bc" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_01a067ac-d389-7963-a04c-4e69a8b3e7ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_01a067ac-d389-7f80-a8f3-58cb1d02551c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_01a067ac-d389-7963-a04c-4e69a8b3e7ac" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_01a067ac-d389-7f80-a8f3-58cb1d02551c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-79d6-a0d4-66106b24f566" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-73b9-8b12-dbd4b73bf0bc" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-79d6-a0d4-66106b24f566" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-79d6-a0d4-66106b24f566_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-79d6-a0d4-66106b24f566" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-79d6-a0d4-66106b24f566_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-7e5c-aeb5-0c46f004801e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d389-79d6-a0d4-66106b24f566" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-7e5c-aeb5-0c46f004801e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-7919-a63c-223b7cadc17f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d389-7e5c-aeb5-0c46f004801e" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-7919-a63c-223b7cadc17f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-765d-8e2f-e6551d22f7fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_01a067ac-d389-73b9-8b12-dbd4b73bf0bc" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-765d-8e2f-e6551d22f7fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-765d-8e2f-e6551d22f7fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-765d-8e2f-e6551d22f7fd" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-765d-8e2f-e6551d22f7fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-733e-bd2b-15cb10191a0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-765d-8e2f-e6551d22f7fd" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-733e-bd2b-15cb10191a0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-7a51-b1f1-b335e5e74b96" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-733e-bd2b-15cb10191a0d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-7a51-b1f1-b335e5e74b96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_01a067ac-d42d-7bd4-8a5e-a79d030a0b7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-7a51-b1f1-b335e5e74b96" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_01a067ac-d42d-7bd4-8a5e-a79d030a0b7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_01a067ac-d42d-7149-a025-9d08a6b2d6f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ChangeDuringPeriodFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-7a51-b1f1-b335e5e74b96" xlink:to="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_01a067ac-d42d-7149-a025-9d08a6b2d6f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ImpairedLoansFairValueDisclosure_01a067ac-d42d-7388-bc94-3fc4033cd246" xlink:href="hban-20260930.xsd#hban_ImpairedLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d42d-728e-b7f1-5cbee761d43d" xlink:to="loc_hban_ImpairedLoansFairValueDisclosure_01a067ac-d42d-7388-bc94-3fc4033cd246" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ImpairedLoansFairValueDisclosureGainsLosses_01a067ac-d42d-7d79-aa62-55b609db66d1" xlink:href="hban-20260930.xsd#hban_ImpairedLoansFairValueDisclosureGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_01a067ac-d42d-728e-b7f1-5cbee761d43d" xlink:to="loc_hban_ImpairedLoansFairValueDisclosureGainsLosses_01a067ac-d42d-7d79-aa62-55b609db66d1" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESSignificantUnobservableLevel3InputsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESSignificantUnobservableLevel3InputsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESSignificantUnobservableLevel3InputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_01a067ac-d42d-7096-98b1-01bc6e0c6659" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_01a067ac-d42d-7096-98b1-01bc6e0c6659" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42d-7e40-b363-7da36f4e13b7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42d-7e40-b363-7da36f4e13b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7e40-b363-7da36f4e13b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42d-7e40-b363-7da36f4e13b7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7e40-b363-7da36f4e13b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7255-b656-e691677e7858" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42d-7e40-b363-7da36f4e13b7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7255-b656-e691677e7858" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d42d-7190-91a7-27d7b75e8b71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7255-b656-e691677e7858" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_01a067ac-d42d-7190-91a7-27d7b75e8b71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d42d-78a8-b8fd-b8faafefe4f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42d-7255-b656-e691677e7858" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_01a067ac-d42d-78a8-b8fd-b8faafefe4f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a067ac-d42d-7c41-a9d3-d3b9b066c304" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:to="loc_srt_RangeAxis_01a067ac-d42d-7c41-a9d3-d3b9b066c304" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d42d-7c41-a9d3-d3b9b066c304_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a067ac-d42d-7c41-a9d3-d3b9b066c304" xlink:to="loc_srt_RangeMember_01a067ac-d42d-7c41-a9d3-d3b9b066c304_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d42d-737b-b1b2-0eb0fd68cdd7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a067ac-d42d-7c41-a9d3-d3b9b066c304" xlink:to="loc_srt_RangeMember_01a067ac-d42d-737b-b1b2-0eb0fd68cdd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a067ac-d42d-74e3-a365-d53d9806c27f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d42d-737b-b1b2-0eb0fd68cdd7" xlink:to="loc_srt_MinimumMember_01a067ac-d42d-74e3-a365-d53d9806c27f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a067ac-d42d-720b-925e-a92273f20ba2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d42d-737b-b1b2-0eb0fd68cdd7" xlink:to="loc_srt_MaximumMember_01a067ac-d42d-720b-925e-a92273f20ba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_01a067ac-d42d-7ea1-b50c-2b282ecc6e1d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d42d-737b-b1b2-0eb0fd68cdd7" xlink:to="loc_srt_WeightedAverageMember_01a067ac-d42d-7ea1-b50c-2b282ecc6e1d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_01a067ac-d42d-7db0-b483-9e6d803a017a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:to="loc_us-gaap_ValuationTechniqueAxis_01a067ac-d42d-7db0-b483-9e6d803a017a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_01a067ac-d42d-7db0-b483-9e6d803a017a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_01a067ac-d42d-7db0-b483-9e6d803a017a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_01a067ac-d42d-7db0-b483-9e6d803a017a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_01a067ac-d42d-70ad-b8fa-cced8bdd5db0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_01a067ac-d42d-7db0-b483-9e6d803a017a" xlink:to="loc_us-gaap_ValuationTechniqueDomain_01a067ac-d42d-70ad-b8fa-cced8bdd5db0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_01a067ac-d42d-7b13-9190-a11ed49e2838" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_01a067ac-d42d-70ad-b8fa-cced8bdd5db0" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_01a067ac-d42d-7b13-9190-a11ed49e2838" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-77f7-865f-f1970eacaa99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-77f7-865f-f1970eacaa99" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-77f7-865f-f1970eacaa99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-77f7-865f-f1970eacaa99" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-77f7-865f-f1970eacaa99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-7195-8439-84984b3fce8c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-77f7-865f-f1970eacaa99" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-7195-8439-84984b3fce8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-7c3a-b694-da29b4028cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-7195-8439-84984b3fce8c" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-7c3a-b694-da29b4028cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_01a067ac-d42d-74ea-9145-845d8fe85e0c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_01a067ac-d42d-78aa-94e5-a2cc83bd7061" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_01a067ac-d42d-74ea-9145-845d8fe85e0c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-74ea-9145-845d8fe85e0c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_01a067ac-d42d-74ea-9145-845d8fe85e0c" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-74ea-9145-845d8fe85e0c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_01a067ac-d42d-74ea-9145-845d8fe85e0c" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputConstantPrepaymentRateMember_01a067ac-d42d-77eb-9abb-cea7ce0e14d0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputConstantPrepaymentRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:to="loc_us-gaap_MeasurementInputConstantPrepaymentRateMember_01a067ac-d42d-77eb-9abb-cea7ce0e14d0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MeasurementInputOptionAdjustedSpreadMember_01a067ac-d42d-761b-9865-163a67fb5d0a" xlink:href="hban-20260930.xsd#hban_MeasurementInputOptionAdjustedSpreadMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:to="loc_hban_MeasurementInputOptionAdjustedSpreadMember_01a067ac-d42d-761b-9865-163a67fb5d0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_01a067ac-d42d-7478-a91f-2d06a4e41831" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_01a067ac-d42d-7478-a91f-2d06a4e41831" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDefaultRateMember_01a067ac-d42d-7167-8a26-7cf9ab478d6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputDefaultRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:to="loc_us-gaap_MeasurementInputDefaultRateMember_01a067ac-d42d-7167-8a26-7cf9ab478d6f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputLossSeverityMember_01a067ac-d42d-7f0d-9713-a5d2812cc153" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MeasurementInputLossSeverityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_01a067ac-d42d-7959-b64d-821bb7c22b69" xlink:to="loc_us-gaap_MeasurementInputLossSeverityMember_01a067ac-d42d-7f0d-9713-a5d2812cc153" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServicingAssetMeasurementInput_01a067ac-d42d-76bd-80a1-baef629c76a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ServicingAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_01a067ac-d42d-7096-98b1-01bc6e0c6659" xlink:to="loc_us-gaap_ServicingAssetMeasurementInput_01a067ac-d42d-76bd-80a1-baef629c76a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_01a067ac-d42d-780e-982e-c4b5f699ffa4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_01a067ac-d42d-7096-98b1-01bc6e0c6659" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_01a067ac-d42d-780e-982e-c4b5f699ffa4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESBalanceSheetLocationDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#FAIRVALUESOFASSETSANDLIABILITIESBalanceSheetLocationDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/FAIRVALUESOFASSETSANDLIABILITIESBalanceSheetLocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a067ac-d42d-7908-962e-79cfcd9c9ae5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a067ac-d42d-76e4-a3a2-66617522e397" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByBalanceSheetGroupingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a067ac-d42d-7908-962e-79cfcd9c9ae5" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a067ac-d42d-76e4-a3a2-66617522e397" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ReportedValueMeasurementAxis_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6" xlink:href="hban-20260930.xsd#hban_ReportedValueMeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a067ac-d42d-76e4-a3a2-66617522e397" xlink:to="loc_hban_ReportedValueMeasurementAxis_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6_default" xlink:href="hban-20260930.xsd#hban_ReportedValueMeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hban_ReportedValueMeasurementAxis_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6" xlink:to="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-7cb9-b3d9-44860f1ff221" xlink:href="hban-20260930.xsd#hban_ReportedValueMeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hban_ReportedValueMeasurementAxis_01a067ac-d42d-79e9-b9ea-ff82d0f6e1c6" xlink:to="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-7cb9-b3d9-44860f1ff221" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AmortizedCostMember_01a067ac-d42d-7e8c-a6c3-be0d87f4ad5c" xlink:href="hban-20260930.xsd#hban_AmortizedCostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-7cb9-b3d9-44860f1ff221" xlink:to="loc_hban_AmortizedCostMember_01a067ac-d42d-7e8c-a6c3-be0d87f4ad5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LowerOfCostOrMarketMember_01a067ac-d42d-72c2-80fc-a3ab3a9c9e62" xlink:href="hban-20260930.xsd#hban_LowerOfCostOrMarketMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-7cb9-b3d9-44860f1ff221" xlink:to="loc_hban_LowerOfCostOrMarketMember_01a067ac-d42d-72c2-80fc-a3ab3a9c9e62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueFairValueOptionMember_01a067ac-d42d-7241-933a-5a08d79a54c2" xlink:href="hban-20260930.xsd#hban_FairValueFairValueOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_ReportedValueMeasurementDomain_01a067ac-d42d-7cb9-b3d9-44860f1ff221" xlink:to="loc_hban_FairValueFairValueOptionMember_01a067ac-d42d-7241-933a-5a08d79a54c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-780b-a408-d405200114a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a067ac-d42d-76e4-a3a2-66617522e397" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-780b-a408-d405200114a3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-780b-a408-d405200114a3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-780b-a408-d405200114a3" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-780b-a408-d405200114a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-73ed-b648-18dabc827f2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_01a067ac-d42d-780b-a408-d405200114a3" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-73ed-b648-18dabc827f2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-72cb-b136-2eec9616cfa7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_01a067ac-d42d-73ed-b648-18dabc827f2b" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-72cb-b136-2eec9616cfa7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_01a067ac-d42d-7c36-bcd1-647157346346" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-72cb-b136-2eec9616cfa7" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_01a067ac-d42d-7c36-bcd1-647157346346" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_01a067ac-d42d-7299-b373-e9f28b64a263" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_01a067ac-d42d-72cb-b136-2eec9616cfa7" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_01a067ac-d42d-7299-b373-e9f28b64a263" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-7abe-a161-533803d0f30e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueByBalanceSheetGroupingTable_01a067ac-d42d-76e4-a3a2-66617522e397" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-7abe-a161-533803d0f30e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-7abe-a161-533803d0f30e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-7abe-a161-533803d0f30e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-7abe-a161-533803d0f30e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-76e6-9daa-b596c52c2986" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_01a067ac-d42d-7abe-a161-533803d0f30e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-76e6-9daa-b596c52c2986" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_01a067ac-d42d-7b24-ba12-542d06eb8957" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-76e6-9daa-b596c52c2986" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_01a067ac-d42d-7b24-ba12-542d06eb8957" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_01a067ac-d42d-7b14-bb0a-075fc7cc371c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-76e6-9daa-b596c52c2986" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_01a067ac-d42d-7b14-bb0a-075fc7cc371c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-73ca-95b3-b2908eeadf62" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_01a067ac-d42d-76e6-9daa-b596c52c2986" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_01a067ac-d42d-73ca-95b3-b2908eeadf62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a067ac-d42d-7908-962e-79cfcd9c9ae5" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CashAndShortTermAssets_01a067ac-d42d-7784-9792-4ad26c820340" xlink:href="hban-20260930.xsd#hban_CashAndShortTermAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_hban_CashAndShortTermAssets_01a067ac-d42d-7784-9792-4ad26c820340" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingSecurities_01a067ac-d42d-71ae-bd88-6ef762f6dc21" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_TradingSecurities_01a067ac-d42d-71ae-bd88-6ef762f6dc21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d42d-7fa3-bf2c-097936d8901c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_01a067ac-d42d-7fa3-bf2c-097936d8901c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d42d-7060-9d2c-5f2d789cf468" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss_01a067ac-d42d-7060-9d2c-5f2d789cf468" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherSecurities_01a067ac-d42d-7143-b2d1-b5a2672434ed" xlink:href="hban-20260930.xsd#hban_OtherSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_hban_OtherSecurities_01a067ac-d42d-7143-b2d1-b5a2672434ed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_01a067ac-d42d-75e6-bcfd-6cdaedf42922" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_LoansReceivableHeldForSaleNetNotPartOfDisposalGroup_01a067ac-d42d-75e6-bcfd-6cdaedf42922" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d42d-71ba-8658-9f4f05d6b59b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d42d-71ba-8658-9f4f05d6b59b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d42d-7b02-bddd-855b9ce7897b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d42d-7b02-bddd-855b9ce7897b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_01a067ac-d42d-7d45-98aa-16812e01f039" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_DerivativeAssetFairValueGrossLiabilityAndObligationToReturnCashOffset_01a067ac-d42d-7d45-98aa-16812e01f039" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_01a067ac-d42d-71da-bb1b-81fb7d11c9df" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_DerivativeAssets_01a067ac-d42d-71da-bb1b-81fb7d11c9df" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldInTrust_01a067ac-d42d-739d-a420-518cc5178125" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsHeldInTrust"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_us-gaap_AssetsHeldInTrust_01a067ac-d42d-739d-a420-518cc5178125" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherSecuritiesOnlyMeasuredAtFairValue_01a067ac-d42d-7d2b-84d7-63fb273cb9cf" xlink:href="hban-20260930.xsd#hban_OtherSecuritiesOnlyMeasuredAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_01a067ac-d42d-7038-9244-4d518dab882b" xlink:to="loc_hban_OtherSecuritiesOnlyMeasuredAtFairValue_01a067ac-d42d-7d2b-84d7-63fb273cb9cf" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_01a067ac-d42d-7908-962e-79cfcd9c9ae5" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_01a067ac-d42d-7b1b-b9ef-2e037cebb552" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Deposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_Deposits_01a067ac-d42d-7b1b-b9ef-2e037cebb552" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_01a067ac-d42d-7da7-9102-118298a00c8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_ShortTermBorrowings_01a067ac-d42d-7da7-9102-118298a00c8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a067ac-d42d-7dd8-ae53-ab34665fba25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_LongTermDebt_01a067ac-d42d-7dd8-ae53-ab34665fba25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d42d-751f-9428-fb057c30150d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d42d-751f-9428-fb057c30150d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_01a067ac-d42d-7933-aacc-9cefe13733c9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_DerivativeLiabilityFairValueGrossAssetAndRightToReclaimCashOffset_01a067ac-d42d-7933-aacc-9cefe13733c9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_01a067ac-d42d-707f-8c8a-dce250fbed03" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_DerivativeLiabilities_01a067ac-d42d-707f-8c8a-dce250fbed03" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TimeDepositLiabilityAboveUsInsuranceLimit_01a067ac-d42d-7d86-bbcf-97bf0b632b40" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TimeDepositLiabilityAboveUsInsuranceLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_01a067ac-d42d-77dd-be87-588d26782f6b" xlink:to="loc_us-gaap_TimeDepositLiabilityAboveUsInsuranceLimit_01a067ac-d42d-7d86-bbcf-97bf0b632b40" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSHedgingInstrumentsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSHedgingInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSHedgingInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_01a067ac-d42d-74ad-b67f-cbd9f9d60e80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_01a067ac-d42d-7c58-b351-c3c37fba9e3f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_01a067ac-d42d-74ad-b67f-cbd9f9d60e80" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_01a067ac-d42d-7c58-b351-c3c37fba9e3f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-70c5-98b3-1f6e68568821" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_01a067ac-d42d-7c58-b351-c3c37fba9e3f" xlink:to="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-70c5-98b3-1f6e68568821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-70c5-98b3-1f6e68568821_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-70c5-98b3-1f6e68568821" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-70c5-98b3-1f6e68568821_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7bed-b3d3-032f40b88f55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-70c5-98b3-1f6e68568821" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7bed-b3d3-032f40b88f55" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_01a067ac-d42d-73b0-913e-ec7536c5bced" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7bed-b3d3-032f40b88f55" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_01a067ac-d42d-73b0-913e-ec7536c5bced" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7424-a84e-15e3afe46c09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7bed-b3d3-032f40b88f55" xlink:to="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7424-a84e-15e3afe46c09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-76b9-91f9-60f4db458ccf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_01a067ac-d42d-7c58-b351-c3c37fba9e3f" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-76b9-91f9-60f4db458ccf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-76b9-91f9-60f4db458ccf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-76b9-91f9-60f4db458ccf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-76b9-91f9-60f4db458ccf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-76b9-91f9-60f4db458ccf" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-7302-a530-74e5d09d67ca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-7302-a530-74e5d09d67ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7c2c-82b6-90abd2e48648" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:to="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7c2c-82b6-90abd2e48648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityContractMember_01a067ac-d42d-7ab8-8167-a134b4822f7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:to="loc_us-gaap_EquityContractMember_01a067ac-d42d-7ab8-8167-a134b4822f7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_01a067ac-d42d-7f09-a734-fcf63ceeb302" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:to="loc_us-gaap_CommodityContractMember_01a067ac-d42d-7f09-a734-fcf63ceeb302" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-7b4f-a8d3-78b0826e5a29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditRiskContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7ebd-accb-2223d2b379bf" xlink:to="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-7b4f-a8d3-78b0826e5a29" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42d-7b81-be3f-32d0bccbcaca" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_01a067ac-d42d-74ad-b67f-cbd9f9d60e80" xlink:to="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42d-7b81-be3f-32d0bccbcaca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:href="hban-20260930.xsd#hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_01a067ac-d42d-74ad-b67f-cbd9f9d60e80" xlink:to="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateFairValueHedgeAssetAtFairValue_01a067ac-d42d-7e2a-942a-0868088af024" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateFairValueHedgeAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_InterestRateFairValueHedgeAssetAtFairValue_01a067ac-d42d-7e2a-942a-0868088af024" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7f08-9178-d607fd5c9094" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7f08-9178-d607fd5c9094" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7f9a-9add-db8e28e68c8b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7f9a-9add-db8e28e68c8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-791c-a69a-554fbe433da5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-791c-a69a-554fbe433da5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7a5a-a1fc-789bc1d38df2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsAssetAtFairValue_01a067ac-d42d-7a5a-a1fc-789bc1d38df2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d42d-7a23-8c5b-86a6e95dbc7c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_AssetDerivativesIncludedInAccruedIncomeAndOtherAssetsAbstract_01a067ac-d42d-7d84-9e3c-7cfefd011eaa" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_01a067ac-d42d-7a23-8c5b-86a6e95dbc7c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:href="hban-20260930.xsd#hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_01a067ac-d42d-74ad-b67f-cbd9f9d60e80" xlink:to="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue_01a067ac-d42d-733a-8377-e6175f4a05e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_InterestRateFairValueHedgeLiabilityAtFairValue_01a067ac-d42d-733a-8377-e6175f4a05e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-7a93-97b1-63b0997ff59e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_InterestRateDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-7a93-97b1-63b0997ff59e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-73d0-adff-606c42f82c44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_ForeignCurrencyDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-73d0-adff-606c42f82c44" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-7734-aa34-891ba218ae6f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_PriceRiskDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-7734-aa34-891ba218ae6f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-79ac-a977-e2269f466610" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsLiabilityAtFairValue_01a067ac-d42d-79ac-a977-e2269f466610" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d42d-79b9-bf28-196a6d49fed3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_LiabilityDerivativesIncludedInAccruedExpensesAndOtherLiabilitiesAbstract_01a067ac-d42d-7813-a548-0c23056d9010" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_01a067ac-d42d-79b9-bf28-196a6d49fed3" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-778b-990e-8203a557a133_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-778b-990e-8203a557a133_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7300-953a-6c3d6aa0e84e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:to="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7300-953a-6c3d6aa0e84e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7af7-bf29-1edc87632167_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7af7-bf29-1edc87632167_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-78d0-899d-7a023a2b73d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-78d0-899d-7a023a2b73d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7e51-89b7-b077172aeb73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7e51-89b7-b077172aeb73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityContractMember_01a067ac-d42d-787b-9dc9-cc30df0a7cef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_EquityContractMember_01a067ac-d42d-787b-9dc9-cc30df0a7cef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_01a067ac-d42d-734d-bb1b-a9a5407be1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_CommodityContractMember_01a067ac-d42d-734d-bb1b-a9a5407be1f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-795c-bbfd-dd6bf04e1002" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditRiskContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-795c-bbfd-dd6bf04e1002" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-708a-b014-e08f084f4f2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-708a-b014-e08f084f4f2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-77ec-b09b-499095a3dc0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:to="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-77ec-b09b-499095a3dc0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7b22-ada6-860e8152a013_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7b22-ada6-860e8152a013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CapitalMarketFeesMember_01a067ac-d42d-7b90-8739-ab91468c33ae" xlink:href="hban-20260930.xsd#hban_CapitalMarketFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_CapitalMarketFeesMember_01a067ac-d42d-7b90-8739-ab91468c33ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageBankingIncomeMember_01a067ac-d42d-7b44-928c-50ff8e218aaf" xlink:href="hban-20260930.xsd#hban_MortgageBankingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_MortgageBankingIncomeMember_01a067ac-d42d-7b44-928c-50ff8e218aaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeAndExpenseMember_01a067ac-d42d-763a-aec4-746106aab38b" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeAndExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_OtherNoninterestIncomeAndExpenseMember_01a067ac-d42d-763a-aec4-746106aab38b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeMember_01a067ac-d42d-778c-97eb-cc3e25246438" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_OtherNoninterestIncomeMember_01a067ac-d42d-778c-97eb-cc3e25246438" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d42d-79ae-b9a1-ea92420f9936" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d42d-79ae-b9a1-ea92420f9936" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_01a067ac-d42d-708a-bce4-986faabf61a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_01a067ac-d42d-708a-bce4-986faabf61a7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails_1" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails_1"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSGainLossDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-778b-990e-8203a557a133_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-778b-990e-8203a557a133_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-778b-990e-8203a557a133" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7300-953a-6c3d6aa0e84e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7be9-b1f8-7bfee57c83cb" xlink:to="loc_us-gaap_NondesignatedMember_01a067ac-d42d-7300-953a-6c3d6aa0e84e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7af7-bf29-1edc87632167_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7af7-bf29-1edc87632167_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7af7-bf29-1edc87632167" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-78d0-899d-7a023a2b73d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-78d0-899d-7a023a2b73d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7e51-89b7-b077172aeb73" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_ForeignExchangeContractMember_01a067ac-d42d-7e51-89b7-b077172aeb73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityContractMember_01a067ac-d42d-787b-9dc9-cc30df0a7cef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_EquityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_EquityContractMember_01a067ac-d42d-787b-9dc9-cc30df0a7cef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommodityContractMember_01a067ac-d42d-734d-bb1b-a9a5407be1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommodityContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_CommodityContractMember_01a067ac-d42d-734d-bb1b-a9a5407be1f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-795c-bbfd-dd6bf04e1002" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditRiskContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7f1a-b2c4-1203c8815faf" xlink:to="loc_us-gaap_CreditRiskContractMember_01a067ac-d42d-795c-bbfd-dd6bf04e1002" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-708a-b014-e08f084f4f2f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-708a-b014-e08f084f4f2f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-708a-b014-e08f084f4f2f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-77ec-b09b-499095a3dc0d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-71c9-8aa1-067a704e127e" xlink:to="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-77ec-b09b-499095a3dc0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-7562-80d2-e29c024d2058" xlink:to="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7b22-ada6-860e8152a013_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7b22-ada6-860e8152a013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a067ac-d42d-7b22-ada6-860e8152a013" xlink:to="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CapitalMarketFeesMember_01a067ac-d42d-7b90-8739-ab91468c33ae" xlink:href="hban-20260930.xsd#hban_CapitalMarketFeesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_CapitalMarketFeesMember_01a067ac-d42d-7b90-8739-ab91468c33ae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_MortgageBankingIncomeMember_01a067ac-d42d-7b44-928c-50ff8e218aaf" xlink:href="hban-20260930.xsd#hban_MortgageBankingIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_MortgageBankingIncomeMember_01a067ac-d42d-7b44-928c-50ff8e218aaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeAndExpenseMember_01a067ac-d42d-763a-aec4-746106aab38b" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeAndExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_OtherNoninterestIncomeAndExpenseMember_01a067ac-d42d-763a-aec4-746106aab38b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestIncomeMember_01a067ac-d42d-778c-97eb-cc3e25246438" xlink:href="hban-20260930.xsd#hban_OtherNoninterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a067ac-d42d-7d1c-8c12-dfe71b9bd263" xlink:to="loc_hban_OtherNoninterestIncomeMember_01a067ac-d42d-778c-97eb-cc3e25246438" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_01a067ac-d42d-708a-bce4-986faabf61a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42d-72a6-aba3-f669a5dc8c55" xlink:to="loc_us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet_01a067ac-d42d-708a-bce4-986faabf61a7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSAssetandLiabilityManagementDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSAssetandLiabilityManagementDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSAssetandLiabilityManagementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditDerivativesLineItems_01a067ac-d42d-727b-b433-b1c026c490fd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditDerivativesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfCreditDerivativesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_CreditDerivativesLineItems_01a067ac-d42d-727b-b433-b1c026c490fd" xlink:to="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42d-7ae1-ac14-52374e91fb9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42d-7ae1-ac14-52374e91fb9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-7ae1-ac14-52374e91fb9f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42d-7ae1-ac14-52374e91fb9f" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-7ae1-ac14-52374e91fb9f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-742c-9a91-1204b319fdf3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42d-7ae1-ac14-52374e91fb9f" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-742c-9a91-1204b319fdf3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42d-7aab-bcb6-374ffc7c0346" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-742c-9a91-1204b319fdf3" xlink:to="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42d-7aab-bcb6-374ffc7c0346" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_01a067ac-d42d-74b0-a350-7b165db505e6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-742c-9a91-1204b319fdf3" xlink:to="loc_us-gaap_LoansPayableMember_01a067ac-d42d-74b0-a350-7b165db505e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherLongTermDebtMember_01a067ac-d42d-7a68-9c34-281e83a599a0" xlink:href="hban-20260930.xsd#hban_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42d-742c-9a91-1204b319fdf3" xlink:to="loc_hban_OtherLongTermDebtMember_01a067ac-d42d-7a68-9c34-281e83a599a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-7c02-b24e-1c239b4cc5a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-7c02-b24e-1c239b4cc5a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7c02-b24e-1c239b4cc5a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-7c02-b24e-1c239b4cc5a7" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7c02-b24e-1c239b4cc5a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7332-a749-b85b0cf316b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42d-7c02-b24e-1c239b4cc5a7" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7332-a749-b85b0cf316b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-7410-83d5-187250b4d8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7332-a749-b85b0cf316b4" xlink:to="loc_us-gaap_FairValueHedgingMember_01a067ac-d42d-7410-83d5-187250b4d8b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_01a067ac-d42d-741c-91ab-f20f38d42f43" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42d-7332-a749-b85b0cf316b4" xlink:to="loc_us-gaap_CashFlowHedgingMember_01a067ac-d42d-741c-91ab-f20f38d42f43" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-7cf2-98eb-8601bfcf5577" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:to="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-7cf2-98eb-8601bfcf5577" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7cf2-98eb-8601bfcf5577_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-7cf2-98eb-8601bfcf5577" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7cf2-98eb-8601bfcf5577_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7dd7-9c95-58fb3312ace4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_01a067ac-d42d-7cf2-98eb-8601bfcf5577" xlink:to="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7dd7-9c95-58fb3312ace4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_01a067ac-d42d-7e86-abea-64c6f6e1b933" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7dd7-9c95-58fb3312ace4" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_01a067ac-d42d-7e86-abea-64c6f6e1b933" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotDesignatedAsHedgingInstrumentEconomicHedgeMember_01a067ac-d42d-7319-a724-77e4b580e15a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotDesignatedAsHedgingInstrumentEconomicHedgeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_01a067ac-d42d-7dd7-9c95-58fb3312ace4" xlink:to="loc_us-gaap_NotDesignatedAsHedgingInstrumentEconomicHedgeMember_01a067ac-d42d-7319-a724-77e4b580e15a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42d-7809-b1db-77149f4a31cb" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:to="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42d-7809-b1db-77149f4a31cb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42d-7809-b1db-77149f4a31cb_default" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42d-7809-b1db-77149f4a31cb" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42d-7809-b1db-77149f4a31cb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42d-7c61-bbdf-3e4771971656" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42d-7809-b1db-77149f4a31cb" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42d-7c61-bbdf-3e4771971656" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherLongTermDebtMember_01a067ac-d42d-768f-a8c3-62de5930527f" xlink:href="hban-20260930.xsd#hban_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42d-7c61-bbdf-3e4771971656" xlink:to="loc_hban_OtherLongTermDebtMember_01a067ac-d42d-768f-a8c3-62de5930527f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfCreditDerivativesTable_01a067ac-d42d-74f8-9b90-9530fa0227fb" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7e2e-8b97-ff39d5d9af15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42d-7d10-bd2a-4b0ae67fa74e" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7e2e-8b97-ff39d5d9af15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-7137-b116-4e20ef111f26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42d-7e2e-8b97-ff39d5d9af15" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42d-7137-b116-4e20ef111f26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotionalAmountOfDerivativesAbstract_01a067ac-d42d-79c4-a666-c5c64e195f26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotionalAmountOfDerivativesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditDerivativesLineItems_01a067ac-d42d-727b-b433-b1c026c490fd" xlink:to="loc_us-gaap_NotionalAmountOfDerivativesAbstract_01a067ac-d42d-79c4-a666-c5c64e195f26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42d-7faf-8a46-337040531166" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NotionalAmountOfDerivativesAbstract_01a067ac-d42d-79c4-a666-c5c64e195f26" xlink:to="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42d-7faf-8a46-337040531166" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_IncreaseDecreaseToNetInterestIncomeDueToDerivativeAdjustment_01a067ac-d42d-7a7c-a3d1-be8ce8771765" xlink:href="hban-20260930.xsd#hban_IncreaseDecreaseToNetInterestIncomeDueToDerivativeAdjustment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NotionalAmountOfDerivativesAbstract_01a067ac-d42d-79c4-a666-c5c64e195f26" xlink:to="loc_hban_IncreaseDecreaseToNetInterestIncomeDueToDerivativeAdjustment_01a067ac-d42d-7a7c-a3d1-be8ce8771765" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d42d-7ae0-be3c-75d8ff77f6eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementOfIncomeLocationBalanceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_us-gaap_StatementOfIncomeLocationBalanceAxis_01a067ac-d42d-7ae0-be3c-75d8ff77f6eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7067-8db7-bf035eb1cf71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7067-8db7-bf035eb1cf71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentSecuritiesMember_01a067ac-d42e-7589-a7d6-3e0c5bd08809" xlink:href="hban-20260930.xsd#hban_InvestmentSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_InvestmentSecuritiesMember_01a067ac-d42e-7589-a7d6-3e0c5bd08809" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedinvestmentsecuritiesMember_01a067ac-d42e-78dc-b61f-27dede567eae" xlink:href="hban-20260930.xsd#hban_HedgedinvestmentsecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_HedgedinvestmentsecuritiesMember_01a067ac-d42e-78dc-b61f-27dede567eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SubordinatedNotesMember_01a067ac-d42e-7d44-8cf2-bd6e8a022c02" xlink:href="hban-20260930.xsd#hban_SubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_SubordinatedNotesMember_01a067ac-d42e-7d44-8cf2-bd6e8a022c02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedSubordinatedNotesMember_01a067ac-d42e-73e5-9e2a-fe2fdbc7b1ed" xlink:href="hban-20260930.xsd#hban_HedgedSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_HedgedSubordinatedNotesMember_01a067ac-d42e-73e5-9e2a-fe2fdbc7b1ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42e-7ac6-90c0-0023e8e97dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42e-7ac6-90c0-0023e8e97dc6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7bdc-9956-925a2e84f61e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7bdc-9956-925a2e84f61e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42e-791d-a029-7fabcf2f1f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:to="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42e-791d-a029-7fabcf2f1f2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-7ae6-bfed-d48738b137e4_default" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-7ae6-bfed-d48738b137e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherLongTermDebtMember_01a067ac-d42e-7db3-af91-2f1b6a86d7a3" xlink:href="hban-20260930.xsd#hban_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:to="loc_hban_OtherLongTermDebtMember_01a067ac-d42e-7db3-af91-2f1b6a86d7a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_01a067ac-d42e-7d77-85ee-e6cb03f4dc81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_01a067ac-d42e-7d77-85ee-e6cb03f4dc81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_01a067ac-d42e-7f8c-8752-28ea70eaab30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_01a067ac-d42e-7f8c-8752-28ea70eaab30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_01a067ac-d42e-7d26-9dc7-05c66aa3689f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_01a067ac-d42e-7d26-9dc7-05c66aa3689f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d42e-7d6b-8245-90da4f8a645a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d42e-7d6b-8245-90da4f8a645a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost_01a067ac-d42e-7900-a85a-1cbafdd8fa43" xlink:href="hban-20260930.xsd#hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost_01a067ac-d42e-7900-a85a-1cbafdd8fa43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease_01a067ac-d42e-7fae-962f-896cef85bb76" xlink:href="hban-20260930.xsd#hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease_01a067ac-d42e-7fae-962f-896cef85bb76" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueHedgingAdjustments_01a067ac-d42e-7e82-96fd-5af281c88bd6" xlink:href="hban-20260930.xsd#hban_FairValueHedgingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_FairValueHedgingAdjustments_01a067ac-d42e-7e82-96fd-5af281c88bd6" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails_1" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails_1"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSFairValueHedgesDetails_1" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7067-8db7-bf035eb1cf71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7067-8db7-bf035eb1cf71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7067-8db7-bf035eb1cf71" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_InvestmentSecuritiesMember_01a067ac-d42e-7589-a7d6-3e0c5bd08809" xlink:href="hban-20260930.xsd#hban_InvestmentSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_InvestmentSecuritiesMember_01a067ac-d42e-7589-a7d6-3e0c5bd08809" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedinvestmentsecuritiesMember_01a067ac-d42e-78dc-b61f-27dede567eae" xlink:href="hban-20260930.xsd#hban_HedgedinvestmentsecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_HedgedinvestmentsecuritiesMember_01a067ac-d42e-78dc-b61f-27dede567eae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_SubordinatedNotesMember_01a067ac-d42e-7d44-8cf2-bd6e8a022c02" xlink:href="hban-20260930.xsd#hban_SubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_SubordinatedNotesMember_01a067ac-d42e-7d44-8cf2-bd6e8a022c02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedSubordinatedNotesMember_01a067ac-d42e-73e5-9e2a-fe2fdbc7b1ed" xlink:href="hban-20260930.xsd#hban_HedgedSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_hban_HedgedSubordinatedNotesMember_01a067ac-d42e-73e5-9e2a-fe2fdbc7b1ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateContractMember_01a067ac-d42e-7ac6-90c0-0023e8e97dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-70b9-8b8e-99281abc9367" xlink:to="loc_us-gaap_InterestRateContractMember_01a067ac-d42e-7ac6-90c0-0023e8e97dc6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7bdc-9956-925a2e84f61e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7bdc-9956-925a2e84f61e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7bdc-9956-925a2e84f61e" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42e-791d-a029-7fabcf2f1f2e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-72fd-b0df-05dcbafdc6b1" xlink:to="loc_us-gaap_SecuritiesInvestmentMember_01a067ac-d42e-791d-a029-7fabcf2f1f2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42d-75e7-b07d-4fb7257d4b2d" xlink:to="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-7ae6-bfed-d48738b137e4_default" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-7ae6-bfed-d48738b137e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:href="hban-20260930.xsd#hban_UnderlyingLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hban_UnderlyingLiabilityClassAxis_01a067ac-d42e-7ae6-bfed-d48738b137e4" xlink:to="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherLongTermDebtMember_01a067ac-d42e-7db3-af91-2f1b6a86d7a3" xlink:href="hban-20260930.xsd#hban_OtherLongTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hban_UnderlyingLiabilityClassDomain_01a067ac-d42e-76f1-a3e4-34ad41acf7bb" xlink:to="loc_hban_OtherLongTermDebtMember_01a067ac-d42e-7db3-af91-2f1b6a86d7a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_01a067ac-d42e-7d77-85ee-e6cb03f4dc81" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerAmount_01a067ac-d42e-7d77-85ee-e6cb03f4dc81" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_01a067ac-d42e-7f8c-8752-28ea70eaab30" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_IncreaseDecreaseInFairValueOfHedgedItemInInterestRateFairValueHedge1_01a067ac-d42e-7f8c-8752-28ea70eaab30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_01a067ac-d42e-7d26-9dc7-05c66aa3689f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_PrepayableFinancialAssetClosedPortfolioLastOfLayerAmortizedCost_01a067ac-d42e-7d26-9dc7-05c66aa3689f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d42e-7d6b-8245-90da4f8a645a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_us-gaap_HedgedAssetFairValueHedgeLastOfLayerCumulativeIncreaseDecrease_01a067ac-d42e-7d6b-8245-90da4f8a645a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost_01a067ac-d42e-7900-a85a-1cbafdd8fa43" xlink:href="hban-20260930.xsd#hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_FinancialLiabilityClosedPortfolioPortfolioLayerMethodAmortizedCost_01a067ac-d42e-7900-a85a-1cbafdd8fa43" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease_01a067ac-d42e-7fae-962f-896cef85bb76" xlink:href="hban-20260930.xsd#hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_HedgedLiabilityFairValueHedgePortfolioLayerMethodHedgedLayerFairValueCumulativeIncreaseDecrease_01a067ac-d42e-7fae-962f-896cef85bb76" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FairValueHedgingAdjustments_01a067ac-d42e-7e82-96fd-5af281c88bd6" xlink:href="hban-20260930.xsd#hban_FairValueHedgingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-7de1-a9b7-c7f258db509d" xlink:to="loc_hban_FairValueHedgingAdjustments_01a067ac-d42e-7e82-96fd-5af281c88bd6" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSCashFlowHedgesandEconomicHedgesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSCashFlowHedgesandEconomicHedgesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSCashFlowHedgesandEconomicHedgesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-750b-9599-fec1a3d6cf51" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42e-7f18-979a-68c19e36d621" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-750b-9599-fec1a3d6cf51" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42e-7f18-979a-68c19e36d621" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7b2a-9720-fb1982d3be97" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42e-7f18-979a-68c19e36d621" xlink:to="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7b2a-9720-fb1982d3be97" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7b2a-9720-fb1982d3be97_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7b2a-9720-fb1982d3be97" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7b2a-9720-fb1982d3be97_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7224-b032-c6589601306d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnderlyingAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_UnderlyingAssetClassAxis_01a067ac-d42e-7b2a-9720-fb1982d3be97" xlink:to="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7224-b032-c6589601306d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableMember_01a067ac-d42e-7704-b60a-efbb88894912" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_UnderlyingAssetClassDomain_01a067ac-d42e-7224-b032-c6589601306d" xlink:to="loc_us-gaap_LoansPayableMember_01a067ac-d42e-7704-b60a-efbb88894912" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42e-74cc-8efb-5d99b68c369f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_01a067ac-d42e-7f18-979a-68c19e36d621" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42e-74cc-8efb-5d99b68c369f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42e-74cc-8efb-5d99b68c369f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42e-74cc-8efb-5d99b68c369f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42e-74cc-8efb-5d99b68c369f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42e-7f80-b0de-687693181539" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_01a067ac-d42e-74cc-8efb-5d99b68c369f" xlink:to="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42e-7f80-b0de-687693181539" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_01a067ac-d42e-78ef-8297-b038e02ce165" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_01a067ac-d42e-7f80-b0de-687693181539" xlink:to="loc_us-gaap_CashFlowHedgingMember_01a067ac-d42e-78ef-8297-b038e02ce165" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42e-7bb0-9e2d-6a11906f6840" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-750b-9599-fec1a3d6cf51" xlink:to="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42e-7bb0-9e2d-6a11906f6840" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_01a067ac-d42e-743a-bf6f-594636752587" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_01a067ac-d42e-750b-9599-fec1a3d6cf51" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_01a067ac-d42e-743a-bf6f-594636752587" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSMSRHedgingActivitiesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSMSRHedgingActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSMSRHedgingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_01a067ac-d42e-7a4a-8b5f-22a5272ad414" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_01a067ac-d42e-7a4a-8b5f-22a5272ad414" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7d03-becd-7f757d4c0853" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_01a067ac-d42e-7a4a-8b5f-22a5272ad414" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7d03-becd-7f757d4c0853" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7d03-becd-7f757d4c0853_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7d03-becd-7f757d4c0853" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7d03-becd-7f757d4c0853_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-77c6-a90f-36a9a078b80a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7d03-becd-7f757d4c0853" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-77c6-a90f-36a9a078b80a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommitmentstoSellLoansMember_01a067ac-d42e-7212-b286-c7c48b2e6ecb" xlink:href="hban-20260930.xsd#hban_CommitmentstoSellLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-77c6-a90f-36a9a078b80a" xlink:to="loc_hban_CommitmentstoSellLoansMember_01a067ac-d42e-7212-b286-c7c48b2e6ecb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7627-a186-6c8c23b5b823" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_01a067ac-d42e-7a4a-8b5f-22a5272ad414" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7627-a186-6c8c23b5b823" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7627-a186-6c8c23b5b823_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7627-a186-6c8c23b5b823" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7627-a186-6c8c23b5b823_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74c7-8845-65d7bf8578a1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7627-a186-6c8c23b5b823" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74c7-8845-65d7bf8578a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DerivativeUsedInMortgageBankingActivitiesMember_01a067ac-d42e-7aa3-8a5f-41712cb216d7" xlink:href="hban-20260930.xsd#hban_DerivativeUsedInMortgageBankingActivitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74c7-8845-65d7bf8578a1" xlink:to="loc_hban_DerivativeUsedInMortgageBankingActivitiesMember_01a067ac-d42e-7aa3-8a5f-41712cb216d7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeNet_01a067ac-d42e-74bf-94f8-e7114a448013" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeFairValueOfDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeNet_01a067ac-d42e-74bf-94f8-e7114a448013" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommitmentsToSellResidentialRealEstateLoans_01a067ac-d42e-7d0c-8e5c-20ded0179b31" xlink:href="hban-20260930.xsd#hban_CommitmentsToSellResidentialRealEstateLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_hban_CommitmentsToSellResidentialRealEstateLoans_01a067ac-d42e-7d0c-8e5c-20ded0179b31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeRemainingMaturity1_01a067ac-d42e-703a-872a-8502ce370d2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeRemainingMaturity1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_DerivativeRemainingMaturity1_01a067ac-d42e-703a-872a-8502ce370d2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42e-7a48-adf0-5ebef1379d83" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_DerivativeNotionalAmount_01a067ac-d42e-7a48-adf0-5ebef1379d83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradingLiabilities_01a067ac-d42e-7b56-a378-f46180acd459" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TradingLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_TradingLiabilities_01a067ac-d42e-7b56-a378-f46180acd459" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_01a067ac-d42e-7377-bf1e-97e76f838e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_01a067ac-d42e-7d73-9135-0791a72884a6" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_01a067ac-d42e-7377-bf1e-97e76f838e2b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSDerivativesUsedinCustomerRelatedActivitiesDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#DERIVATIVEFINANCIALINSTRUMENTSDerivativesUsedinCustomerRelatedActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/DERIVATIVEFINANCIALINSTRUMENTSDerivativesUsedinCustomerRelatedActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_01a067ac-d42e-7fc4-82e5-f58cbc4ab5c1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_01a067ac-d42e-7830-9b06-6c4f3f7c5dfe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_01a067ac-d42e-7fc4-82e5-f58cbc4ab5c1" xlink:to="loc_us-gaap_DerivativeTable_01a067ac-d42e-7830-9b06-6c4f3f7c5dfe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7c66-86c2-364609709c5a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_01a067ac-d42e-7830-9b06-6c4f3f7c5dfe" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7c66-86c2-364609709c5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7c66-86c2-364609709c5a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7c66-86c2-364609709c5a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-7c66-86c2-364609709c5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74d6-83da-4c31f5d9845a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01a067ac-d42e-7c66-86c2-364609709c5a" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74d6-83da-4c31f5d9845a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DerivativeUsedInTradingActivityMember_01a067ac-d42e-75b9-8c45-6de843495208" xlink:href="hban-20260930.xsd#hban_DerivativeUsedInTradingActivityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_01a067ac-d42e-74d6-83da-4c31f5d9845a" xlink:to="loc_hban_DerivativeUsedInTradingActivityMember_01a067ac-d42e-75b9-8c45-6de843495208" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_01a067ac-d42e-779d-ae1c-f8c7c7335a80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a067ac-d42e-7fc4-82e5-f58cbc4ab5c1" xlink:to="loc_us-gaap_DerivativeAssetsLiabilitiesAtFairValueNet_01a067ac-d42e-779d-ae1c-f8c7c7335a80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DerivativeFinancialInstrumentsUsedByCompanyOnBehalfOfCustomersIncludingOffsettingDerivativesNotionalValue_01a067ac-d42e-7bec-b042-2cc6fd2b0973" xlink:href="hban-20260930.xsd#hban_DerivativeFinancialInstrumentsUsedByCompanyOnBehalfOfCustomersIncludingOffsettingDerivativesNotionalValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a067ac-d42e-7fc4-82e5-f58cbc4ab5c1" xlink:to="loc_hban_DerivativeFinancialInstrumentsUsedByCompanyOnBehalfOfCustomersIncludingOffsettingDerivativesNotionalValue_01a067ac-d42e-7bec-b042-2cc6fd2b0973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CreditRisksFromInterestRateSwapsUsedForTradingPurposes_01a067ac-d42e-7b47-9b5a-5e2d8f54541d" xlink:href="hban-20260930.xsd#hban_CreditRisksFromInterestRateSwapsUsedForTradingPurposes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_01a067ac-d42e-7fc4-82e5-f58cbc4ab5c1" xlink:to="loc_hban_CreditRisksFromInterestRateSwapsUsedForTradingPurposes_01a067ac-d42e-7b47-9b5a-5e2d8f54541d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/VARIABLEINTERESTENTITIESConsolidatedDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#VARIABLEINTERESTENTITIESConsolidatedDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/VARIABLEINTERESTENTITIESConsolidatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-73c5-8221-d8515e20606c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-77ad-928a-ef289122f99c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-73c5-8221-d8515e20606c" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-77ad-928a-ef289122f99c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-7a95-a9ef-acab1fcf58c7" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-77ad-928a-ef289122f99c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-7a95-a9ef-acab1fcf58c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7a95-a9ef-acab1fcf58c7_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-7a95-a9ef-acab1fcf58c7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7a95-a9ef-acab1fcf58c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7c9c-aad0-97c51220bdfe" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-7a95-a9ef-acab1fcf58c7" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7c9c-aad0-97c51220bdfe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a067ac-d42e-7075-adba-3249ad5ec25d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7c9c-aad0-97c51220bdfe" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_01a067ac-d42e-7075-adba-3249ad5ec25d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_01a067ac-d42e-725a-a13c-4b64784b9fb6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-73c5-8221-d8515e20606c" xlink:to="loc_us-gaap_AssetsAbstract_01a067ac-d42e-725a-a13c-4b64784b9fb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d42e-7deb-8e93-bdb9668e64c4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a067ac-d42e-725a-a13c-4b64784b9fb6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_01a067ac-d42e-7deb-8e93-bdb9668e64c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_01a067ac-d42e-775f-b33d-6b36976d9bfd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a067ac-d42e-725a-a13c-4b64784b9fb6" xlink:to="loc_us-gaap_OtherAssets_01a067ac-d42e-775f-b33d-6b36976d9bfd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_01a067ac-d42e-76e2-956f-88edce403dac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_01a067ac-d42e-725a-a13c-4b64784b9fb6" xlink:to="loc_us-gaap_Assets_01a067ac-d42e-76e2-956f-88edce403dac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_01a067ac-d42e-735b-a833-5a6b2bbe1fbe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-73c5-8221-d8515e20606c" xlink:to="loc_us-gaap_LiabilitiesAbstract_01a067ac-d42e-735b-a833-5a6b2bbe1fbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_01a067ac-d42e-730b-8b4f-32afdf9f78bf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a067ac-d42e-735b-a833-5a6b2bbe1fbe" xlink:to="loc_us-gaap_LongTermDebt_01a067ac-d42e-730b-8b4f-32afdf9f78bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_01a067ac-d42e-721b-a8d4-289a19458904" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a067ac-d42e-735b-a833-5a6b2bbe1fbe" xlink:to="loc_us-gaap_OtherLiabilities_01a067ac-d42e-721b-a8d4-289a19458904" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_01a067ac-d42e-7280-b96a-0f870cf23bff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_01a067ac-d42e-735b-a833-5a6b2bbe1fbe" xlink:to="loc_us-gaap_Liabilities_01a067ac-d42e-7280-b96a-0f870cf23bff" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/VARIABLEINTERESTENTITIESUnconsolidatedVIEsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#VARIABLEINTERESTENTITIESUnconsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/VARIABLEINTERESTENTITIESUnconsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-738b-bc84-82710458986d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-7b3e-a44c-09f5e0feac36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-738b-bc84-82710458986d" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-7b3e-a44c-09f5e0feac36" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-775c-8e2a-be9b2622b1f7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-7b3e-a44c-09f5e0feac36" xlink:to="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-775c-8e2a-be9b2622b1f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-775c-8e2a-be9b2622b1f7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-775c-8e2a-be9b2622b1f7" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-775c-8e2a-be9b2622b1f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b65-ac4b-000d48039cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-775c-8e2a-be9b2622b1f7" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b65-ac4b-000d48039cd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LowIncomeHousingTaxCreditPartnersMember_01a067ac-d42e-788f-9520-c2b5df365137" xlink:href="hban-20260930.xsd#hban_LowIncomeHousingTaxCreditPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b65-ac4b-000d48039cd7" xlink:to="loc_hban_LowIncomeHousingTaxCreditPartnersMember_01a067ac-d42e-788f-9520-c2b5df365137" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_TrustPreferredSecuritiesMember_01a067ac-d42e-7e79-a3d0-f996498d1a60" xlink:href="hban-20260930.xsd#hban_TrustPreferredSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b65-ac4b-000d48039cd7" xlink:to="loc_hban_TrustPreferredSecuritiesMember_01a067ac-d42e-7e79-a3d0-f996498d1a60" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherThanSecuritiesInvestmentMember_01a067ac-d42e-7fdb-a0df-3bf6fa34f30e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherThanSecuritiesInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b65-ac4b-000d48039cd7" xlink:to="loc_us-gaap_OtherThanSecuritiesInvestmentMember_01a067ac-d42e-7fdb-a0df-3bf6fa34f30e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-776c-8aec-ace549db2210" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-7b3e-a44c-09f5e0feac36" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-776c-8aec-ace549db2210" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-776c-8aec-ace549db2210_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-776c-8aec-ace549db2210" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-776c-8aec-ace549db2210_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7e04-94d2-a6e1ad2a5009" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-776c-8aec-ace549db2210" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7e04-94d2-a6e1ad2a5009" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_01a067ac-d42e-7e22-bc28-1375b5c3a22e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7e04-94d2-a6e1ad2a5009" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_01a067ac-d42e-7e22-bc28-1375b5c3a22e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_01a067ac-d42e-7bf1-9e72-955b594261b4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-738b-bc84-82710458986d" xlink:to="loc_us-gaap_Assets_01a067ac-d42e-7bf1-9e72-955b594261b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_01a067ac-d42e-78b2-8118-79cf8999322e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-738b-bc84-82710458986d" xlink:to="loc_us-gaap_Liabilities_01a067ac-d42e-78b2-8118-79cf8999322e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_01a067ac-d42e-7f68-86fa-048f61cbf00c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-738b-bc84-82710458986d" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_01a067ac-d42e-7f68-86fa-048f61cbf00c" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/VARIABLEINTERESTENTITIESLowIncomeHousingTaxCreditPartnershipsDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#VARIABLEINTERESTENTITIESLowIncomeHousingTaxCreditPartnershipsDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/VARIABLEINTERESTENTITIESLowIncomeHousingTaxCreditPartnershipsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-729c-84ed-23d09bc7c7f0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfVariableInterestEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-729c-84ed-23d09bc7c7f0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-74c9-bf31-7363f81c364f" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-729c-84ed-23d09bc7c7f0" xlink:to="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-74c9-bf31-7363f81c364f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-74c9-bf31-7363f81c364f_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-74c9-bf31-7363f81c364f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-74c9-bf31-7363f81c364f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7cc9-9034-2cd3c06d6c62" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_01a067ac-d42e-74c9-bf31-7363f81c364f" xlink:to="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7cc9-9034-2cd3c06d6c62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_01a067ac-d42e-7d5e-b235-5a641ff27b31" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_01a067ac-d42e-7cc9-9034-2cd3c06d6c62" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_01a067ac-d42e-7d5e-b235-5a641ff27b31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_01a067ac-d42e-729c-84ed-23d09bc7c7f0" xlink:to="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-78aa-b237-110e43c5c01c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_01a067ac-d42e-7b14-a63f-d1f22f2e3c6b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-78aa-b237-110e43c5c01c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LowIncomeHousingTaxCreditPartnersMember_01a067ac-d42e-7152-b2f8-e13d5919afad" xlink:href="hban-20260930.xsd#hban_LowIncomeHousingTaxCreditPartnersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-78aa-b237-110e43c5c01c" xlink:to="loc_hban_LowIncomeHousingTaxCreditPartnersMember_01a067ac-d42e-7152-b2f8-e13d5919afad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ProportionalAmortizationMethodMember_01a067ac-d42e-7c69-881f-680d0bfacf4e" xlink:href="hban-20260930.xsd#hban_ProportionalAmortizationMethodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_01a067ac-d42e-78aa-b237-110e43c5c01c" xlink:to="loc_hban_ProportionalAmortizationMethodMember_01a067ac-d42e-7c69-881f-680d0bfacf4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_GrossInvestmentInQualifiedAffordableHousingProjects_01a067ac-d42e-70c5-93fe-1bff01394e94" xlink:href="hban-20260930.xsd#hban_GrossInvestmentInQualifiedAffordableHousingProjects"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_hban_GrossInvestmentInQualifiedAffordableHousingProjects_01a067ac-d42e-70c5-93fe-1bff01394e94" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAccumulatedAmortization_01a067ac-d42e-7b7e-a4fc-c8cf9d003918" xlink:href="hban-20260930.xsd#hban_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_hban_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAccumulatedAmortization_01a067ac-d42e-7b7e-a4fc-c8cf9d003918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestments_01a067ac-d42e-76d7-9ff7-8ca6bf7632f2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestments_01a067ac-d42e-76d7-9ff7-8ca6bf7632f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_QualifiedAffordableHousingProjectInvestmentsCommitment_01a067ac-d42e-7a59-81ec-70dd43beb7af" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_QualifiedAffordableHousingProjectInvestmentsCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_us-gaap_QualifiedAffordableHousingProjectInvestmentsCommitment_01a067ac-d42e-7a59-81ec-70dd43beb7af" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount_01a067ac-d42e-7d17-9d32-14f5d1471724" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_us-gaap_AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount_01a067ac-d42e-7d17-9d32-14f5d1471724" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization_01a067ac-d42e-7996-b9ad-b46176cbb964" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_01a067ac-d42e-7cf5-a162-210aecdcfb15" xlink:to="loc_us-gaap_AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization_01a067ac-d42e-7996-b9ad-b46176cbb964" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/COMMITMENTSANDCONTINGENTLIABILITIESCommitmentstoExtendCreditDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#COMMITMENTSANDCONTINGENTLIABILITIESCommitmentstoExtendCreditDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/COMMITMENTSANDCONTINGENTLIABILITIESCommitmentstoExtendCreditDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_01a067ac-d42e-7562-b658-ed000f82ccba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_01a067ac-d42e-7f08-bf54-9de21a96ce5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_01a067ac-d42e-7562-b658-ed000f82ccba" xlink:to="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_01a067ac-d42e-7f08-bf54-9de21a96ce5b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-72fe-9c41-88fcf05b2b26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_01a067ac-d42e-7f08-bf54-9de21a96ce5b" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-72fe-9c41-88fcf05b2b26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-72fe-9c41-88fcf05b2b26_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-72fe-9c41-88fcf05b2b26" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-72fe-9c41-88fcf05b2b26_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-72fe-9c41-88fcf05b2b26" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialLoanMember_01a067ac-d42e-712d-ab33-0700821133b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:to="loc_us-gaap_CommercialLoanMember_01a067ac-d42e-712d-ab33-0700821133b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsumerLoanMember_01a067ac-d42e-7a31-9544-32f5d2671573" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ConsumerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:to="loc_us-gaap_ConsumerLoanMember_01a067ac-d42e-7a31-9544-32f5d2671573" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstateMember_01a067ac-d42e-7818-a7fa-ab38bdd320a0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:to="loc_us-gaap_CommercialRealEstateMember_01a067ac-d42e-7818-a7fa-ab38bdd320a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_01a067ac-d42e-7e92-9fed-13add6c4ffc5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-723e-8853-134099671e09" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_01a067ac-d42e-7e92-9fed-13add6c4ffc5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_01a067ac-d42e-7833-83a0-63f4ca34ab7e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_01a067ac-d42e-7562-b658-ed000f82ccba" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_01a067ac-d42e-7833-83a0-63f4ca34ab7e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/COMMITMENTSANDCONTINGENTLIABILITIESNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7591-b6fd-7fbebb3c4be6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:to="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7591-b6fd-7fbebb3c4be6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7591-b6fd-7fbebb3c4be6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7591-b6fd-7fbebb3c4be6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7591-b6fd-7fbebb3c4be6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7f9f-bbd8-cccebf2cb69d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_01a067ac-d42e-7591-b6fd-7fbebb3c4be6" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7f9f-bbd8-cccebf2cb69d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_01a067ac-d42e-7b2d-9cbe-28945ba18eee" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandbyLettersOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_01a067ac-d42e-7f9f-bbd8-cccebf2cb69d" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_01a067ac-d42e-7b2d-9cbe-28945ba18eee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a067ac-d42e-7756-bd22-53ebb656324d" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:to="loc_srt_RangeAxis_01a067ac-d42e-7756-bd22-53ebb656324d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d42e-7756-bd22-53ebb656324d_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a067ac-d42e-7756-bd22-53ebb656324d" xlink:to="loc_srt_RangeMember_01a067ac-d42e-7756-bd22-53ebb656324d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a067ac-d42e-7f47-9461-50fdb02bdfe0" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a067ac-d42e-7756-bd22-53ebb656324d" xlink:to="loc_srt_RangeMember_01a067ac-d42e-7f47-9461-50fdb02bdfe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_01a067ac-d42e-7d31-9e0d-3130583c3e49" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d42e-7f47-9461-50fdb02bdfe0" xlink:to="loc_srt_MinimumMember_01a067ac-d42e-7d31-9e0d-3130583c3e49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a067ac-d42e-7b69-a00a-107822dcc28b" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a067ac-d42e-7f47-9461-50fdb02bdfe0" xlink:to="loc_srt_MaximumMember_01a067ac-d42e-7b69-a00a-107822dcc28b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_01a067ac-d42e-7db0-b9d1-89aa6331b944" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:to="loc_srt_LitigationCaseAxis_01a067ac-d42e-7db0-b9d1-89aa6331b944" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_01a067ac-d42e-7db0-b9d1-89aa6331b944_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_01a067ac-d42e-7db0-b9d1-89aa6331b944" xlink:to="loc_srt_LitigationCaseTypeDomain_01a067ac-d42e-7db0-b9d1-89aa6331b944_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_01a067ac-d42e-7f00-ab25-731979274d20" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_01a067ac-d42e-7db0-b9d1-89aa6331b944" xlink:to="loc_srt_LitigationCaseTypeDomain_01a067ac-d42e-7f00-ab25-731979274d20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_DonelonV.AmericasInsuranceCo.AndCadenceBankV.BostickMember_01a067ac-d42e-7c19-9988-6b5ee2c28e38" xlink:href="hban-20260930.xsd#hban_DonelonV.AmericasInsuranceCo.AndCadenceBankV.BostickMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_01a067ac-d42e-7f00-ab25-731979274d20" xlink:to="loc_hban_DonelonV.AmericasInsuranceCo.AndCadenceBankV.BostickMember_01a067ac-d42e-7c19-9988-6b5ee2c28e38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_01a067ac-d42e-7d58-be1f-3037cc76119d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:to="loc_us-gaap_LitigationStatusAxis_01a067ac-d42e-7d58-be1f-3037cc76119d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_01a067ac-d42e-7d58-be1f-3037cc76119d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_01a067ac-d42e-7d58-be1f-3037cc76119d" xlink:to="loc_us-gaap_LitigationStatusDomain_01a067ac-d42e-7d58-be1f-3037cc76119d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_01a067ac-d42e-76d0-979a-8a010c9e9d00" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_01a067ac-d42e-7d58-be1f-3037cc76119d" xlink:to="loc_us-gaap_LitigationStatusDomain_01a067ac-d42e-76d0-979a-8a010c9e9d00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_01a067ac-d42e-7ce4-896f-996eb298302b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_01a067ac-d42e-76d0-979a-8a010c9e9d00" xlink:to="loc_us-gaap_PendingLitigationMember_01a067ac-d42e-7ce4-896f-996eb298302b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_01a067ac-d42e-7a58-a338-395a10ce235e" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_01a067ac-d42e-763f-816a-05cbfcf76134" xlink:to="loc_dei_LegalEntityAxis_01a067ac-d42e-7a58-a338-395a10ce235e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a067ac-d42e-7a58-a338-395a10ce235e_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_01a067ac-d42e-7a58-a338-395a10ce235e" xlink:to="loc_dei_EntityDomain_01a067ac-d42e-7a58-a338-395a10ce235e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_01a067ac-d42e-76bf-9be5-9f2b56c4953f" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_01a067ac-d42e-7a58-a338-395a10ce235e" xlink:to="loc_dei_EntityDomain_01a067ac-d42e-76bf-9be5-9f2b56c4953f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CadenceBankMember_01a067ac-d42e-7d40-9c91-8773f0e4d577" xlink:href="hban-20260930.xsd#hban_CadenceBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_01a067ac-d42e-76bf-9be5-9f2b56c4953f" xlink:to="loc_hban_CadenceBankMember_01a067ac-d42e-7d40-9c91-8773f0e4d577" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod_01a067ac-d42e-716c-aca5-6f6b8d272c14" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_us-gaap_StandbyBondPurchaseCommitmentExpirationPeriod_01a067ac-d42e-716c-aca5-6f6b8d272c14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_01a067ac-d42e-795b-96a9-434befb188c7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_us-gaap_DeferredRevenue_01a067ac-d42e-795b-96a9-434befb188c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_01a067ac-d42e-7bbb-9a02-9899cbbde631" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_01a067ac-d42e-7bbb-9a02-9899cbbde631" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_01a067ac-d42e-73b9-a98b-2943dd8f87e3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_01a067ac-d42e-73b9-a98b-2943dd8f87e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_LossContingencyLoansReceivableSubjectToRegulatoryActionAmount_01a067ac-d42e-7005-b4a7-17f4461a9243" xlink:href="hban-20260930.xsd#hban_LossContingencyLoansReceivableSubjectToRegulatoryActionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_01a067ac-d42e-775b-94dd-2cd88bd09867" xlink:to="loc_hban_LossContingencyLoansReceivableSubjectToRegulatoryActionAmount_01a067ac-d42e-7005-b4a7-17f4461a9243" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.huntington.com/role/SEGMENTREPORTINGDetails" xlink:type="simple" xlink:href="hban-20260930.xsd#SEGMENTREPORTINGDetails"/>
  <link:definitionLink xlink:role="http://www.huntington.com/role/SEGMENTREPORTINGDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a067ac-d42e-7192-a9b8-201bc67e92ef" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a067ac-d42e-7192-a9b8-201bc67e92ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_01a067ac-d42e-783e-8308-7edd672728ce" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a067ac-d42e-7192-a9b8-201bc67e92ef" xlink:to="loc_srt_ConsolidationItemsAxis_01a067ac-d42e-783e-8308-7edd672728ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-783e-8308-7edd672728ce_default" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d42e-783e-8308-7edd672728ce" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-783e-8308-7edd672728ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-7898-a070-170006956e89" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_01a067ac-d42e-783e-8308-7edd672728ce" xlink:to="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-7898-a070-170006956e89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_01a067ac-d42e-7071-b339-a0caf4d009ff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-7898-a070-170006956e89" xlink:to="loc_us-gaap_OperatingSegmentsMember_01a067ac-d42e-7071-b339-a0caf4d009ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_01a067ac-d42e-760c-b1c1-5cd9e04bc494" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_01a067ac-d42e-7898-a070-170006956e89" xlink:to="loc_us-gaap_CorporateNonSegmentMember_01a067ac-d42e-760c-b1c1-5cd9e04bc494" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d42e-7f5f-968f-261cd9deab36" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_01a067ac-d42e-7192-a9b8-201bc67e92ef" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d42e-7f5f-968f-261cd9deab36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d42e-7f5f-968f-261cd9deab36_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d42e-7f5f-968f-261cd9deab36" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d42e-7f5f-968f-261cd9deab36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_01a067ac-d42e-791b-9c07-e96b91b5214e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_01a067ac-d42e-7f5f-968f-261cd9deab36" xlink:to="loc_us-gaap_SegmentDomain_01a067ac-d42e-791b-9c07-e96b91b5214e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d42e-7ad0-b104-d68c887d443c" xlink:href="hban-20260930.xsd#hban_ConsumerAndBusinessBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d42e-791b-9c07-e96b91b5214e" xlink:to="loc_hban_ConsumerAndBusinessBankingMember_01a067ac-d42e-7ad0-b104-d68c887d443c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_CommercialBankingMember_01a067ac-d42e-7d2c-b9f2-1c4cd73b4c17" xlink:href="hban-20260930.xsd#hban_CommercialBankingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_01a067ac-d42e-791b-9c07-e96b91b5214e" xlink:to="loc_hban_CommercialBankingMember_01a067ac-d42e-7d2c-b9f2-1c4cd73b4c17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_01a067ac-d42e-7489-b99e-ead7e7d58160" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NumberOfReportableSegments_01a067ac-d42e-7489-b99e-ead7e7d58160" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_01a067ac-d42e-7199-9e5a-3e9c209b094f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_01a067ac-d42e-7199-9e5a-3e9c209b094f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d42e-7d62-b89b-1c3848a40dc3" xlink:href="hban-20260930.xsd#hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_hban_FinancingReceivableAndOffBalanceSheetCreditLossExpenseReversal_01a067ac-d42e-7d62-b89b-1c3848a40dc3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_01a067ac-d42e-7366-9da2-b758d9dd255e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_01a067ac-d42e-7366-9da2-b758d9dd255e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_01a067ac-d42e-71c1-9dc2-1583ed240114" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NoninterestIncome_01a067ac-d42e-71c1-9dc2-1583ed240114" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d42e-754a-b081-9c9f9ab74de8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d42e-754a-b081-9c9f9ab74de8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_01a067ac-d42e-7bea-9986-cdf6db05f9ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d42e-754a-b081-9c9f9ab74de8" xlink:to="loc_us-gaap_LaborAndRelatedExpense_01a067ac-d42e-7bea-9986-cdf6db05f9ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hban_OtherNoninterestExpenseIncludingCorporateAllocations_01a067ac-d42e-710e-9b9d-9f723209665c" xlink:href="hban-20260930.xsd#hban_OtherNoninterestExpenseIncludingCorporateAllocations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_01a067ac-d42e-754a-b081-9c9f9ab74de8" xlink:to="loc_hban_OtherNoninterestExpenseIncludingCorporateAllocations_01a067ac-d42e-710e-9b9d-9f723209665c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_01a067ac-d42e-7d1c-8324-bad50544043b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NoninterestExpense_01a067ac-d42e-7d1c-8324-bad50544043b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a067ac-d42e-7da8-8e0e-31c4a8b18586" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_01a067ac-d42e-7da8-8e0e-31c4a8b18586" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_01a067ac-d42e-7355-902b-0ab79d68787f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_01a067ac-d42e-7355-902b-0ab79d68787f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_01a067ac-d42e-7835-8c64-c56fd5dec3cd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_01a067ac-d42e-7835-8c64-c56fd5dec3cd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_01a067ac-d42e-74d5-8e15-6c5dd80fe792" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_NetIncomeLoss_01a067ac-d42e-74d5-8e15-6c5dd80fe792" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_01a067ac-d42e-7b67-bd94-8726a368a134" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_Assets_01a067ac-d42e-7b67-bd94-8726a368a134" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Deposits_01a067ac-d42e-7e20-a7fa-01f2a36d19ba" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_Deposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_01a067ac-d42e-7f43-8843-6d76bde98fbc" xlink:to="loc_us-gaap_Deposits_01a067ac-d42e-7e20-a7fa-01f2a36d19ba" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-roles-2026.xsd#eedm1"/>
  <link:definitionLink xlink:role="http://fasb.org/srt/role/srt-eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperating" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndDividendIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperating" xlink:type="arc" order="691"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_us-gaap_NoninterestIncome" xlink:type="arc" order="692"/>
  </link:definitionLink>
</link:linkbase>
