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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019ed0e6-a5fb-7370-ba1a-607633c0ef6b,g:947c58e7-73ef-46b5-a418-1da159dac66f-->
<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.hondafinancialservices.com/role/Cover" xlink:type="simple" xlink:href="ahfc-20260630.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019ed0e6-a83b-78db-bd96-900f46b76688" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntitiesTable_019ed0e6-a83b-78db-bd96-900f46b76688" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019ed0e6-a83b-7472-9909-acf1193beba3" 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_019ed0e6-a83b-78db-bd96-900f46b76688" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019ed0e6-a83b-7472-9909-acf1193beba3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7472-9909-acf1193beba3_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_019ed0e6-a83b-7472-9909-acf1193beba3" xlink:to="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7472-9909-acf1193beba3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" 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_019ed0e6-a83b-7472-9909-acf1193beba3" xlink:to="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A0750MediumTermNotesSeriesADueNovember252026Member_019ed0e6-a83b-7461-abdb-1b658b25c0a4" xlink:href="ahfc-20260630.xsd#ahfc_A0750MediumTermNotesSeriesADueNovember252026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A0750MediumTermNotesSeriesADueNovember252026Member_019ed0e6-a83b-7461-abdb-1b658b25c0a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A1500MediumTermNotesSeriesADueOctober192027Member_019ed0e6-a83b-795b-ae65-d7b86539973a" xlink:href="ahfc-20260630.xsd#ahfc_A1500MediumTermNotesSeriesADueOctober192027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A1500MediumTermNotesSeriesADueOctober192027Member_019ed0e6-a83b-795b-ae65-d7b86539973a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A3750MediumTermNotesSeriesADueOctober252027Member_019ed0e6-a83b-7815-afd4-3f55d21b98d1" xlink:href="ahfc-20260630.xsd#ahfc_A3750MediumTermNotesSeriesADueOctober252027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A3750MediumTermNotesSeriesADueOctober252027Member_019ed0e6-a83b-7815-afd4-3f55d21b98d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_FloatingRateMediumTermNotesSeriesADueMay282027Member_019ed0e6-a83b-709b-b0c5-371fc6a3a137" xlink:href="ahfc-20260630.xsd#ahfc_FloatingRateMediumTermNotesSeriesADueMay282027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_FloatingRateMediumTermNotesSeriesADueMay282027Member_019ed0e6-a83b-709b-b0c5-371fc6a3a137" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A0300MediumTermNotesSeriesADueJuly72028Member_019ed0e6-a83b-7fba-9313-2cdf5c5da351" xlink:href="ahfc-20260630.xsd#ahfc_A0300MediumTermNotesSeriesADueJuly72028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A0300MediumTermNotesSeriesADueJuly72028Member_019ed0e6-a83b-7fba-9313-2cdf5c5da351" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A2.850MediumTermNotesSeriesADueJune272028Member_019ed0e6-a83b-7d0c-a882-2e280f8ec69f" xlink:href="ahfc-20260630.xsd#ahfc_A2.850MediumTermNotesSeriesADueJune272028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A2.850MediumTermNotesSeriesADueJune272028Member_019ed0e6-a83b-7d0c-a882-2e280f8ec69f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A3.300MediumTermNotesSeriesADueMarch212029Member_019ed0e6-a83b-7cf6-b6c0-508cb1d2a5b7" xlink:href="ahfc-20260630.xsd#ahfc_A3.300MediumTermNotesSeriesADueMarch212029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A3.300MediumTermNotesSeriesADueMarch212029Member_019ed0e6-a83b-7cf6-b6c0-508cb1d2a5b7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A5600MediumTermNotesSeriesADueSeptember62030Member_019ed0e6-a83b-7426-b4f1-b6fb52b88dfa" xlink:href="ahfc-20260630.xsd#ahfc_A5600MediumTermNotesSeriesADueSeptember62030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A5600MediumTermNotesSeriesADueSeptember62030Member_019ed0e6-a83b-7426-b4f1-b6fb52b88dfa" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A3.650MediumTermNotesSeriesADueApril232031Member_019ed0e6-a83b-75f6-acb8-b1e807973e74" xlink:href="ahfc-20260630.xsd#ahfc_A3.650MediumTermNotesSeriesADueApril232031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A3.650MediumTermNotesSeriesADueApril232031Member_019ed0e6-a83b-75f6-acb8-b1e807973e74" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A3.500MediumTermNotesSeriesADueJune272031Member_019ed0e6-a83b-7b29-9922-8945f6ab538a" xlink:href="ahfc-20260630.xsd#ahfc_A3.500MediumTermNotesSeriesADueJune272031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A3.500MediumTermNotesSeriesADueJune272031Member_019ed0e6-a83b-7b29-9922-8945f6ab538a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A5.050MediumTermNotesSeriesADueAugust202031Member_019ed0e6-a83b-7d68-b146-10360b981902" xlink:href="ahfc-20260630.xsd#ahfc_A5.050MediumTermNotesSeriesADueAugust202031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A5.050MediumTermNotesSeriesADueAugust202031Member_019ed0e6-a83b-7d68-b146-10360b981902" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_A3.950MediumTermNotesSeriesADueMarch192032Member_019ed0e6-a83b-7659-85be-4a17dcb75f72" xlink:href="ahfc-20260630.xsd#ahfc_A3.950MediumTermNotesSeriesADueMarch192032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019ed0e6-a83b-7723-bdcf-e9c217a8c96e" xlink:to="loc_ahfc_A3.950MediumTermNotesSeriesADueMarch192032Member_019ed0e6-a83b-7659-85be-4a17dcb75f72" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019ed0e6-a83b-7375-abd6-b85d3552bc36" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentType_019ed0e6-a83b-7375-abd6-b85d3552bc36" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019ed0e6-a83b-7cfe-9016-5ad9dee023a2" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentQuarterlyReport_019ed0e6-a83b-7cfe-9016-5ad9dee023a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019ed0e6-a83b-79e7-a26d-7ac18e9b304a" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentPeriodEndDate_019ed0e6-a83b-79e7-a26d-7ac18e9b304a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019ed0e6-a83b-7da1-b755-53ae76081a74" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentTransitionReport_019ed0e6-a83b-7da1-b755-53ae76081a74" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019ed0e6-a83b-7dcf-a1ad-7705ca78ec30" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityFileNumber_019ed0e6-a83b-7dcf-a1ad-7705ca78ec30" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019ed0e6-a83b-7b39-b0a7-6a51bd03f298" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityRegistrantName_019ed0e6-a83b-7b39-b0a7-6a51bd03f298" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019ed0e6-a83b-781b-b790-3283a21fc7fb" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019ed0e6-a83b-781b-b790-3283a21fc7fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019ed0e6-a83b-7385-b81e-073440c9a00a" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityTaxIdentificationNumber_019ed0e6-a83b-7385-b81e-073440c9a00a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019ed0e6-a83b-74c3-9ba3-d111bae20f3e" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityAddressAddressLine1_019ed0e6-a83b-74c3-9ba3-d111bae20f3e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019ed0e6-a83b-74ce-91ef-6392c48ed726" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityAddressCityOrTown_019ed0e6-a83b-74ce-91ef-6392c48ed726" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019ed0e6-a83b-7d9d-9135-2eb12bddfef4" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityAddressStateOrProvince_019ed0e6-a83b-7d9d-9135-2eb12bddfef4" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019ed0e6-a83b-76f8-adc6-596077a0fe11" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityAddressPostalZipCode_019ed0e6-a83b-76f8-adc6-596077a0fe11" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019ed0e6-a83b-7048-b92a-34ce367b7942" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_CityAreaCode_019ed0e6-a83b-7048-b92a-34ce367b7942" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019ed0e6-a83b-7598-93a9-9b8d90ab50ad" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_LocalPhoneNumber_019ed0e6-a83b-7598-93a9-9b8d90ab50ad" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019ed0e6-a83b-77aa-a108-3b6965875a12" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_Security12bTitle_019ed0e6-a83b-77aa-a108-3b6965875a12" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019ed0e6-a83b-74ff-b16d-26db919bdf51" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_TradingSymbol_019ed0e6-a83b-74ff-b16d-26db919bdf51" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019ed0e6-a83b-78c7-8f60-133f97ce9a94" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_SecurityExchangeName_019ed0e6-a83b-78c7-8f60-133f97ce9a94" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019ed0e6-a83b-7068-99b2-a58519c45a98" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityCurrentReportingStatus_019ed0e6-a83b-7068-99b2-a58519c45a98" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019ed0e6-a83b-76f0-97a7-98fcbe142ffa" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityInteractiveDataCurrent_019ed0e6-a83b-76f0-97a7-98fcbe142ffa" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019ed0e6-a83b-7453-9f8a-a1b511128c76" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityFilerCategory_019ed0e6-a83b-7453-9f8a-a1b511128c76" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019ed0e6-a83b-7310-a6ac-38535df02e7d" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntitySmallBusiness_019ed0e6-a83b-7310-a6ac-38535df02e7d" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019ed0e6-a83b-7729-81d0-3f0d14dfea2a" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityEmergingGrowthCompany_019ed0e6-a83b-7729-81d0-3f0d14dfea2a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019ed0e6-a83b-750b-843a-1564b7db8223" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityShellCompany_019ed0e6-a83b-750b-843a-1564b7db8223" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019ed0e6-a83b-7988-b66d-d8c462016fa1" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019ed0e6-a83b-7988-b66d-d8c462016fa1" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019ed0e6-a83b-7610-952d-4041cc71c936" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_AmendmentFlag_019ed0e6-a83b-7610-952d-4041cc71c936" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019ed0e6-a83b-77f0-bd43-3980bc1ed4c0" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentFiscalYearFocus_019ed0e6-a83b-77f0-bd43-3980bc1ed4c0" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019ed0e6-a83b-7214-90e6-c09af2ab2276" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019ed0e6-a83b-7214-90e6-c09af2ab2276" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019ed0e6-a83b-78f1-a06b-849b8ff4c212" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_EntityCentralIndexKey_019ed0e6-a83b-78f1-a06b-849b8ff4c212" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019ed0e6-a83b-750f-8c25-d41930887f02" 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_019ed0e6-a83b-7fda-8f57-17560665ed4c" xlink:to="loc_dei_CurrentFiscalYearEndDate_019ed0e6-a83b-750f-8c25-d41930887f02" xlink:type="arc" order="28"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/CONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="simple" xlink:href="ahfc-20260630.xsd#CONSOLIDATEDBALANCESHEETSUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/CONSOLIDATEDBALANCESHEETSUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ed0e6-a83b-797f-86d5-35cfc2c32403" 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_019ed0e6-a83b-7383-94af-d32931ba3ea2" 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_019ed0e6-a83b-797f-86d5-35cfc2c32403" xlink:to="loc_us-gaap_StatementTable_019ed0e6-a83b-7383-94af-d32931ba3ea2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019ed0e6-a83b-7383-94af-d32931ba3ea2" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a83b-7bac-a6ee-861b00831ce8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a83b-73ef-8bdf-89b72a01dbe3" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a83b-7bac-a6ee-861b00831ce8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_NonrelatedPartyAndAffiliatedEntityMember_019ed0e6-a83b-72c8-98fc-162b5fd7f658" xlink:href="ahfc-20260630.xsd#ahfc_NonrelatedPartyAndAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a83b-7bac-a6ee-861b00831ce8" xlink:to="loc_ahfc_NonrelatedPartyAndAffiliatedEntityMember_019ed0e6-a83b-72c8-98fc-162b5fd7f658" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ed0e6-a83b-7e10-a25f-16e510177471" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_NonrelatedPartyAndAffiliatedEntityMember_019ed0e6-a83b-72c8-98fc-162b5fd7f658" xlink:to="loc_srt_AffiliatedEntityMember_019ed0e6-a83b-7e10-a25f-16e510177471" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ed0e6-a83b-799f-af82-243ac75c6f06" 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_019ed0e6-a83b-7383-94af-d32931ba3ea2" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ed0e6-a83b-799f-af82-243ac75c6f06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a83b-799f-af82-243ac75c6f06_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_019ed0e6-a83b-799f-af82-243ac75c6f06" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a83b-799f-af82-243ac75c6f06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a83b-7441-9100-61efb071af8c" 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_019ed0e6-a83b-799f-af82-243ac75c6f06" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a83b-7441-9100-61efb071af8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ed0e6-a83b-7d6d-9b8e-3c1098d2d0a6" 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_019ed0e6-a83b-7441-9100-61efb071af8c" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ed0e6-a83b-7d6d-9b8e-3c1098d2d0a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" 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_StatementLineItems_019ed0e6-a83b-797f-86d5-35cfc2c32403" xlink:to="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019ed0e6-a83b-7067-abdf-2631e380a0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019ed0e6-a83b-7067-abdf-2631e380a0c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83b-7bd3-9eb7-cb54a0a29840" 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_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83b-7bd3-9eb7-cb54a0a29840" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_019ed0e6-a83b-781f-8099-5c1be76b9254" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_019ed0e6-a83b-781f-8099-5c1be76b9254" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_019ed0e6-a83b-7c27-90b5-02d1514e891d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_OtherReceivables_019ed0e6-a83b-7c27-90b5-02d1514e891d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_019ed0e6-a83b-7761-815b-3b8481bb6e2f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_IncomeTaxReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_IncomeTaxReceivable_019ed0e6-a83b-7761-815b-3b8481bb6e2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssets_019ed0e6-a83b-70b8-a40d-976d9d4b05d6" 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_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_OtherAssets_019ed0e6-a83b-70b8-a40d-976d9d4b05d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019ed0e6-a83b-7f52-b0f2-df0a7cb0092d" 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_AssetsAbstract_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019ed0e6-a83b-7f52-b0f2-df0a7cb0092d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019ed0e6-a83b-7df4-8c0d-3ddd7ddd0d47" 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_019ed0e6-a83b-7724-bad1-1cd1a9ddec1f" xlink:to="loc_us-gaap_Assets_019ed0e6-a83b-7df4-8c0d-3ddd7ddd0d47" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019ed0e6-a83b-797f-86d5-35cfc2c32403" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ed0e6-a83b-7632-93ae-e5a10586fc82" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ed0e6-a83b-7632-93ae-e5a10586fc82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ed0e6-a83b-713c-8791-2b8116ee0351" 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_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_OtherLiabilities_019ed0e6-a83b-713c-8791-2b8116ee0351" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_019ed0e6-a83b-735e-852b-7419f352d62b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_TaxesPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_TaxesPayableCurrentAndNoncurrent_019ed0e6-a83b-735e-852b-7419f352d62b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019ed0e6-a83b-78a3-87b2-bdb9a9b5496a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_019ed0e6-a83b-78a3-87b2-bdb9a9b5496a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ed0e6-a83b-72b9-b4e9-aa96c68f285b" 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_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ed0e6-a83b-72b9-b4e9-aa96c68f285b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019ed0e6-a83b-7679-a2dd-1bfef52f1062" 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_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_Liabilities_019ed0e6-a83b-7679-a2dd-1bfef52f1062" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_019ed0e6-a83b-7867-bd1d-77430600bf29" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_CommitmentsAndContingencies_019ed0e6-a83b-7867-bd1d-77430600bf29" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019ed0e6-a83b-721e-b11a-b560dc2cfc25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:to="loc_us-gaap_CommonStockValue_019ed0e6-a83b-721e-b11a-b560dc2cfc25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ed0e6-a83b-7606-870a-01eb21d6ae4a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019ed0e6-a83b-7606-870a-01eb21d6ae4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ed0e6-a83b-7b18-a6c2-4110fc0d1ed2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019ed0e6-a83b-7b18-a6c2-4110fc0d1ed2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019ed0e6-a83b-7b31-b48c-5cdf364ef253" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_019ed0e6-a83b-7045-8659-a875bb9b0624" xlink:to="loc_us-gaap_StockholdersEquity_019ed0e6-a83b-7b31-b48c-5cdf364ef253" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019ed0e6-a83b-705f-a24a-df5f9f0d2d3b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_MinorityInterest_019ed0e6-a83b-705f-a24a-df5f9f0d2d3b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ed0e6-a83b-75cd-9697-57d303cdfd6f" 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_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ed0e6-a83b-75cd-9697-57d303cdfd6f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019ed0e6-a83b-78ed-b437-8f1c538b9c4b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019ed0e6-a83b-741a-b5ef-4edba2fd9666" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019ed0e6-a83b-78ed-b437-8f1c538b9c4b" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUNAUDITED" xlink:type="simple" xlink:href="ahfc-20260630.xsd#CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUNAUDITED"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/CONSOLIDATEDSTATEMENTSOFCHANGESINEQUITYUNAUDITED" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019ed0e6-a83b-7112-bc76-402d0ea2f513" 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_019ed0e6-a83b-7cb8-ab94-78e56e78259c" 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_019ed0e6-a83b-7112-bc76-402d0ea2f513" xlink:to="loc_us-gaap_StatementTable_019ed0e6-a83b-7cb8-ab94-78e56e78259c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019ed0e6-a83b-77c8-be54-c46de3c0c9f8" 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_019ed0e6-a83b-7cb8-ab94-78e56e78259c" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019ed0e6-a83b-77c8-be54-c46de3c0c9f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ed0e6-a83b-77c8-be54-c46de3c0c9f8_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_019ed0e6-a83b-77c8-be54-c46de3c0c9f8" xlink:to="loc_us-gaap_EquityComponentDomain_019ed0e6-a83b-77c8-be54-c46de3c0c9f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019ed0e6-a83b-75bf-8941-a83547312b00" 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_019ed0e6-a83b-77c8-be54-c46de3c0c9f8" xlink:to="loc_us-gaap_EquityComponentDomain_019ed0e6-a83b-75bf-8941-a83547312b00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019ed0e6-a83b-7933-87a8-4f5c18b8ff31" 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_019ed0e6-a83b-75bf-8941-a83547312b00" xlink:to="loc_us-gaap_RetainedEarningsMember_019ed0e6-a83b-7933-87a8-4f5c18b8ff31" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ed0e6-a83b-7511-8ac9-ee182c3193a1" 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_019ed0e6-a83b-75bf-8941-a83547312b00" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019ed0e6-a83b-7511-8ac9-ee182c3193a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019ed0e6-a83b-79ea-859e-be0cc07f305a" 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_EquityComponentDomain_019ed0e6-a83b-75bf-8941-a83547312b00" xlink:to="loc_us-gaap_CommonStockMember_019ed0e6-a83b-79ea-859e-be0cc07f305a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019ed0e6-a83b-7619-896a-e4f8f604b26b" 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_019ed0e6-a83b-75bf-8941-a83547312b00" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019ed0e6-a83b-7619-896a-e4f8f604b26b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ed0e6-a83b-7ab5-b537-6f00d6790311" 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_019ed0e6-a83b-7112-bc76-402d0ea2f513" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019ed0e6-a83b-7ab5-b537-6f00d6790311" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ed0e6-a83b-7ba5-b83d-18c5a4ab84f0" 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_019ed0e6-a83b-7ab5-b537-6f00d6790311" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ed0e6-a83b-7ba5-b83d-18c5a4ab84f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019ed0e6-a83b-7cbd-a1a9-9d5d8c2cc86e" 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_019ed0e6-a83b-7ab5-b537-6f00d6790311" xlink:to="loc_us-gaap_ProfitLoss_019ed0e6-a83b-7cbd-a1a9-9d5d8c2cc86e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019ed0e6-a83b-747e-8425-23d24207686b" 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_019ed0e6-a83b-7ab5-b537-6f00d6790311" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_019ed0e6-a83b-747e-8425-23d24207686b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019ed0e6-a83b-7fc1-89e1-56311b748006" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofFinanceReceivablesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesSummaryofFinanceReceivablesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofFinanceReceivablesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7462-a37d-cae17216b5a5" 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_019ed0e6-a83c-7ce2-8f5c-fb1f6e72af19" 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_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-7ce2-8f5c-fb1f6e72af19" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7676-a164-138e562f4fe1" 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_019ed0e6-a83c-7ce2-8f5c-fb1f6e72af19" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7676-a164-138e562f4fe1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7676-a164-138e562f4fe1_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_019ed0e6-a83c-7676-a164-138e562f4fe1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7676-a164-138e562f4fe1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-79b2-8071-e8a97550db98" 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_019ed0e6-a83c-7676-a164-138e562f4fe1" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-79b2-8071-e8a97550db98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7227-9549-d9f0cba4b0a7" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-79b2-8071-e8a97550db98" xlink:to="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7227-9549-d9f0cba4b0a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoanMember_019ed0e6-a83c-71cc-950b-c875d519f5d6" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-79b2-8071-e8a97550db98" xlink:to="loc_ahfc_DealerLoanMember_019ed0e6-a83c-71cc-950b-c875d519f5d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-7d08-8c7f-73e5a740b158" 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_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-7d08-8c7f-73e5a740b158" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019ed0e6-a83c-7ee4-9960-4d23d2efa1fa" 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_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019ed0e6-a83c-7ee4-9960-4d23d2efa1fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DeferredDealerParticipationAndOtherDeferredCosts_019ed0e6-a83c-7b4e-bcc2-6c319d737e55" xlink:href="ahfc-20260630.xsd#ahfc_DeferredDealerParticipationAndOtherDeferredCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_ahfc_DeferredDealerParticipationAndOtherDeferredCosts_019ed0e6-a83c-7b4e-bcc2-6c319d737e55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_FinanceReceivablesUnearnedIncome_019ed0e6-a83c-7fba-9743-83e65eb0f360" xlink:href="ahfc-20260630.xsd#ahfc_FinanceReceivablesUnearnedIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_ahfc_FinanceReceivablesUnearnedIncome_019ed0e6-a83c-7fba-9743-83e65eb0f360" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83c-74e3-b64a-359ecf95ebbb" 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_019ed0e6-a83c-7462-a37d-cae17216b5a5" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83c-74e3-b64a-359ecf95ebbb" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesNarrativeDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesNarrativeDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesNarrativeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-734f-bae3-6feee4386e52" 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_019ed0e6-a83c-7b57-9ca8-263c5cef8375" 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_019ed0e6-a83c-734f-bae3-6feee4386e52" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-7b57-9ca8-263c5cef8375" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_019ed0e6-a83c-765f-9c1f-6aec22f75598" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-7b57-9ca8-263c5cef8375" xlink:to="loc_us-gaap_CollateralAxis_019ed0e6-a83c-765f-9c1f-6aec22f75598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019ed0e6-a83c-765f-9c1f-6aec22f75598_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_019ed0e6-a83c-765f-9c1f-6aec22f75598" xlink:to="loc_us-gaap_CollateralDomain_019ed0e6-a83c-765f-9c1f-6aec22f75598_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_019ed0e6-a83c-719d-b6b3-7e453e837d98" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_019ed0e6-a83c-765f-9c1f-6aec22f75598" xlink:to="loc_us-gaap_CollateralDomain_019ed0e6-a83c-719d-b6b3-7e453e837d98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralPledgedMember_019ed0e6-a83c-7c9a-a5de-6b9c6fba0c32" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CollateralPledgedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_019ed0e6-a83c-719d-b6b3-7e453e837d98" xlink:to="loc_us-gaap_CollateralPledgedMember_019ed0e6-a83c-7c9a-a5de-6b9c6fba0c32" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd" 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_019ed0e6-a83c-7b57-9ca8-263c5cef8375" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd_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_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-78cc-af7d-12ea936cd10c" 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_019ed0e6-a83c-7517-8b1d-a76fd4dd09bd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-78cc-af7d-12ea936cd10c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7c62-a715-3131d6d60ebe" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-78cc-af7d-12ea936cd10c" xlink:to="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7c62-a715-3131d6d60ebe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83c-7819-8427-b391e143dc40" 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_019ed0e6-a83c-734f-bae3-6feee4386e52" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a83c-7819-8427-b391e143dc40" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoansAndLeasesDelinquentPercentage_019ed0e6-a83c-72a2-b22f-3dcd2e6ea6b2" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoansAndLeasesDelinquentPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-734f-bae3-6feee4386e52" xlink:to="loc_ahfc_RetailLoansAndLeasesDelinquentPercentage_019ed0e6-a83c-72a2-b22f-3dcd2e6ea6b2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofActivityinAllowanceforCreditLossesofFinanceReceivablesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesSummaryofActivityinAllowanceforCreditLossesofFinanceReceivablesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofActivityinAllowanceforCreditLossesofFinanceReceivablesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019ed0e6-a83c-7303-99cc-86077655b1f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019ed0e6-a83c-7f84-80c8-7cbc78d7876b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019ed0e6-a83c-7303-99cc-86077655b1f1" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019ed0e6-a83c-7f84-80c8-7cbc78d7876b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba" 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_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019ed0e6-a83c-7f84-80c8-7cbc78d7876b" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba_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_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-77bb-8a19-eb4b759d6410" 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_019ed0e6-a83c-7d5a-9ef0-a0dfd757d4ba" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-77bb-8a19-eb4b759d6410" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoanMember_019ed0e6-a83c-79a2-b90d-58f8dff358a3" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-77bb-8a19-eb4b759d6410" xlink:to="loc_ahfc_RetailLoanMember_019ed0e6-a83c-79a2-b90d-58f8dff358a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7488-aa68-3b9ac17acf46" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-77bb-8a19-eb4b759d6410" xlink:to="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7488-aa68-3b9ac17acf46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019ed0e6-a83c-7cd1-8910-ab5843084965" 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_FinancingReceivableAllowanceForCreditLossesLineItems_019ed0e6-a83c-7303-99cc-86077655b1f1" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019ed0e6-a83c-7b20-8a0e-eeaf78b76abb" 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_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019ed0e6-a83c-7b20-8a0e-eeaf78b76abb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019ed0e6-a83c-7843-9473-43f16524a401" 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_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019ed0e6-a83c-7843-9473-43f16524a401" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-78b3-be36-fbc32ea1653f" 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_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-78b3-be36-fbc32ea1653f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019ed0e6-a83c-72bf-aad1-4403024a3525" 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_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_019ed0e6-a83c-72bf-aad1-4403024a3525" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossForeignCurrencyTranslation_019ed0e6-a83c-7279-aa37-fabd47892d07" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossForeignCurrencyTranslation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019ed0e6-a83c-7cd1-8910-ab5843084965" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossForeignCurrencyTranslation_019ed0e6-a83c-7279-aa37-fabd47892d07" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019ed0e6-a83c-7781-98ef-90f0c020fea0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofAgingAnalysisofPastDueFinanceReceivablesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesSummaryofAgingAnalysisofPastDueFinanceReceivablesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofAgingAnalysisofPastDueFinanceReceivablesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019ed0e6-a83c-70bc-afd7-00f7fd8b2fd6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019ed0e6-a83c-7a6d-86f2-6a38dfe856c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfFinancingReceivablesPastDueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019ed0e6-a83c-70bc-afd7-00f7fd8b2fd6" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivablesPastDueTable_019ed0e6-a83c-7a6d-86f2-6a38dfe856c0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7323-a187-3e76e28d7777" 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_ScheduleOfFinancingReceivablesPastDueTable_019ed0e6-a83c-7a6d-86f2-6a38dfe856c0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7323-a187-3e76e28d7777" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7323-a187-3e76e28d7777_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_019ed0e6-a83c-7323-a187-3e76e28d7777" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7323-a187-3e76e28d7777_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71b9-8a3e-fbdd76f9fff7" 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_019ed0e6-a83c-7323-a187-3e76e28d7777" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71b9-8a3e-fbdd76f9fff7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7452-aa97-969ba7337f84" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71b9-8a3e-fbdd76f9fff7" xlink:to="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7452-aa97-969ba7337f84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7081-9436-1da5aacd5703" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71b9-8a3e-fbdd76f9fff7" xlink:to="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7081-9436-1da5aacd5703" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ed0e6-a83c-751f-a5b2-07784092823c" 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_ScheduleOfFinancingReceivablesPastDueTable_019ed0e6-a83c-7a6d-86f2-6a38dfe856c0" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ed0e6-a83c-751f-a5b2-07784092823c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-751f-a5b2-07784092823c_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_019ed0e6-a83c-751f-a5b2-07784092823c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-751f-a5b2-07784092823c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" 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_019ed0e6-a83c-751f-a5b2-07784092823c" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_NewVehicleMember_019ed0e6-a83c-7c93-a0eb-35d0c9e02c90" xlink:href="ahfc-20260630.xsd#ahfc_NewVehicleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:to="loc_ahfc_NewVehicleMember_019ed0e6-a83c-7c93-a0eb-35d0c9e02c90" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_UsedVehicleMember_019ed0e6-a83c-7e41-8c72-11855a4ce9bc" xlink:href="ahfc-20260630.xsd#ahfc_UsedVehicleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:to="loc_ahfc_UsedVehicleMember_019ed0e6-a83c-7e41-8c72-11855a4ce9bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_MotorcyclesAndOtherMember_019ed0e6-a83c-73de-bfb4-c1fab8036263" xlink:href="ahfc-20260630.xsd#ahfc_MotorcyclesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:to="loc_ahfc_MotorcyclesAndOtherMember_019ed0e6-a83c-73de-bfb4-c1fab8036263" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_WholesaleFlooringMember_019ed0e6-a83c-77e7-8169-240a6447fbfb" xlink:href="ahfc-20260630.xsd#ahfc_WholesaleFlooringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:to="loc_ahfc_WholesaleFlooringMember_019ed0e6-a83c-77e7-8169-240a6447fbfb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CommercialLoansMember_019ed0e6-a83c-77ee-a918-7500cdececb8" xlink:href="ahfc-20260630.xsd#ahfc_CommercialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7060-9092-b5faef70a5f9" xlink:to="loc_ahfc_CommercialLoansMember_019ed0e6-a83c-77ee-a918-7500cdececb8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019ed0e6-a83c-7539-831e-be53bb74dbc1" 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_ScheduleOfFinancingReceivablesPastDueTable_019ed0e6-a83c-7a6d-86f2-6a38dfe856c0" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019ed0e6-a83c-7539-831e-be53bb74dbc1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019ed0e6-a83c-7539-831e-be53bb74dbc1_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_019ed0e6-a83c-7539-831e-be53bb74dbc1" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019ed0e6-a83c-7539-831e-be53bb74dbc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019ed0e6-a83c-7235-a49c-0cec4159911b" 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_019ed0e6-a83c-7539-831e-be53bb74dbc1" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019ed0e6-a83c-7235-a49c-0cec4159911b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_019ed0e6-a83c-736f-9700-5df22ca863ba" 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_019ed0e6-a83c-7235-a49c-0cec4159911b" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_019ed0e6-a83c-736f-9700-5df22ca863ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019ed0e6-a83c-7560-b300-5521c76a75e3" 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_019ed0e6-a83c-736f-9700-5df22ca863ba" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_019ed0e6-a83c-7560-b300-5521c76a75e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019ed0e6-a83c-70cf-a5ad-33336fe99128" 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_019ed0e6-a83c-736f-9700-5df22ca863ba" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_019ed0e6-a83c-70cf-a5ad-33336fe99128" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019ed0e6-a83c-762f-89a6-3b433902e571" 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_019ed0e6-a83c-736f-9700-5df22ca863ba" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019ed0e6-a83c-762f-89a6-3b433902e571" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_019ed0e6-a83c-7e3a-bb19-47d1dee11adc" 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_019ed0e6-a83c-7235-a49c-0cec4159911b" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_019ed0e6-a83c-7e3a-bb19-47d1dee11adc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_FinanceReceivablesNetExcludingCreditLossesAndWriteDowns_019ed0e6-a83c-77bd-a104-ca4077ca7d90" xlink:href="ahfc-20260630.xsd#ahfc_FinanceReceivablesNetExcludingCreditLossesAndWriteDowns"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentPastDueLineItems_019ed0e6-a83c-70bc-afd7-00f7fd8b2fd6" xlink:to="loc_ahfc_FinanceReceivablesNetExcludingCreditLossesAndWriteDowns_019ed0e6-a83c-77bd-a104-ca4077ca7d90" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofLoansbyInternalCreditGradeDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesSummaryofLoansbyInternalCreditGradeDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofLoansbyInternalCreditGradeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7909-aa1d-8fa55e992702" 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_019ed0e6-a83c-778b-b53c-77c1bf427b00" 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_019ed0e6-a83c-7909-aa1d-8fa55e992702" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-778b-b53c-77c1bf427b00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-72e0-956a-0522b0496709" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-778b-b53c-77c1bf427b00" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-72e0-956a-0522b0496709" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-72e0-956a-0522b0496709_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-72e0-956a-0522b0496709" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-72e0-956a-0522b0496709_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-716c-9433-7250a2c056b3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-72e0-956a-0522b0496709" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-716c-9433-7250a2c056b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_019ed0e6-a83c-7d8a-9a12-38229b7761a7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PerformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-716c-9433-7250a2c056b3" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_019ed0e6-a83c-7d8a-9a12-38229b7761a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6" 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_019ed0e6-a83c-778b-b53c-77c1bf427b00" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6_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_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71ac-8f51-24313b43a279" 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_019ed0e6-a83c-7bc8-a05f-fdcecbb83ec6" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71ac-8f51-24313b43a279" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7ada-b304-e289b959d6d2" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-71ac-8f51-24313b43a279" xlink:to="loc_ahfc_RetailLoanMember_019ed0e6-a83c-7ada-b304-e289b959d6d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca" 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_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_019ed0e6-a83c-778b-b53c-77c1bf427b00" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca_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_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" 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_019ed0e6-a83c-750d-981d-1fc5ffb2c9ca" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CreditGradeAMember_019ed0e6-a83c-73b5-b2ed-abb4571d8bfe" xlink:href="ahfc-20260630.xsd#ahfc_CreditGradeAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:to="loc_ahfc_CreditGradeAMember_019ed0e6-a83c-73b5-b2ed-abb4571d8bfe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CreditGradeBMember_019ed0e6-a83c-7069-9bae-085e14e47ad5" xlink:href="ahfc-20260630.xsd#ahfc_CreditGradeBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:to="loc_ahfc_CreditGradeBMember_019ed0e6-a83c-7069-9bae-085e14e47ad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CreditGradeCMember_019ed0e6-a83c-73e5-a8d3-5785877fea35" xlink:href="ahfc-20260630.xsd#ahfc_CreditGradeCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:to="loc_ahfc_CreditGradeCMember_019ed0e6-a83c-73e5-a8d3-5785877fea35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CreditGradeDMember_019ed0e6-a83c-753f-8c99-7cfcd8f24f22" xlink:href="ahfc-20260630.xsd#ahfc_CreditGradeDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:to="loc_ahfc_CreditGradeDMember_019ed0e6-a83c-753f-8c99-7cfcd8f24f22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CreditGradeOtherMember_019ed0e6-a83c-7e5c-9b4c-eba281cf9486" xlink:href="ahfc-20260630.xsd#ahfc_CreditGradeOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7654-9bc8-e06bb94abb7c" xlink:to="loc_ahfc_CreditGradeOtherMember_019ed0e6-a83c-7e5c-9b4c-eba281cf9486" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:href="ahfc-20260630.xsd#ahfc_CurrentPeriodAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7909-aa1d-8fa55e992702" xlink:to="loc_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-7bbb-b890-a0d65e282126" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-7bbb-b890-a0d65e282126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-75f2-bfca-e8217afc707f" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-75f2-bfca-e8217afc707f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7a7c-8aac-91b5b956b4b3" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7a7c-8aac-91b5b956b4b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7fbb-ac31-6f4e68d25be1" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7fbb-ac31-6f4e68d25be1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-708c-a64f-cbf910e0ce34" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-708c-a64f-cbf910e0ce34" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-704d-9464-c1d5582c4e88" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-704d-9464-c1d5582c4e88" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-7ed8-bf33-59d124a8afc6" 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_ahfc_CurrentPeriodAbstract_019ed0e6-a83c-702a-9c3d-3b442720bd87" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-7ed8-bf33-59d124a8afc6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:href="ahfc-20260630.xsd#ahfc_CurrentPeriodGrossWriteOffAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7909-aa1d-8fa55e992702" xlink:to="loc_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-7a1a-aad8-e454d741fce2" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-7a1a-aad8-e454d741fce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7d81-bfa5-a2c6b52d8c31" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7d81-bfa5-a2c6b52d8c31" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7fc8-8913-dad2a34b79aa" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7fc8-8913-dad2a34b79aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-79f6-afb3-de9cd311f01f" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-79f6-afb3-de9cd311f01f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-735d-936a-4e1cf90e11c5" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-735d-936a-4e1cf90e11c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-701b-85bc-d7786e755ab2" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-701b-85bc-d7786e755ab2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7dbb-ba83-fca3ed37af6d" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-73cc-b074-c44cccaa290a" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7dbb-ba83-fca3ed37af6d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PriorYearAbstract_019ed0e6-a83c-7aba-8347-4e4c641411c5" xlink:href="ahfc-20260630.xsd#ahfc_PriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7909-aa1d-8fa55e992702" xlink:to="loc_ahfc_PriorYearAbstract_019ed0e6-a83c-7aba-8347-4e4c641411c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-7fbc-8acb-cda91524b34b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-7ae8-8568-5f2002495b6c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-75fc-acc5-1f9242c1d3c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7ae3-bd4a-6ebaaf2f4057" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-75af-8891-dcbe22d5df68" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-795f-9b48-07b8739cd2e1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-7d7a-8727-fdfd24f3a086" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PriorPeriodGrossWriteOffAbstract_019ed0e6-a83c-7a07-9cf2-b6c8e2c316c8" xlink:href="ahfc-20260630.xsd#ahfc_PriorPeriodGrossWriteOffAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_019ed0e6-a83c-7909-aa1d-8fa55e992702" xlink:to="loc_ahfc_PriorPeriodGrossWriteOffAbstract_019ed0e6-a83c-7a07-9cf2-b6c8e2c316c8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-79b4-b3fb-13402a2cf6e9" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7ac4-b194-3cfe8302550c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7641-825d-48c2a2a36d52" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7478-a428-557653578de1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-70ae-87b9-718ee32e60e4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7cc9-8f00-29f7afb1e791" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7eab-93f3-191db31c0770" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofLoansbyRiskRateGroupingDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FinanceReceivablesSummaryofLoansbyRiskRateGroupingDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FinanceReceivablesSummaryofLoansbyRiskRateGroupingDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" 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_019ed0e6-a83c-7768-9d49-19674d64e443" 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_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019ed0e6-a83c-7768-9d49-19674d64e443" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-7550-b461-be3aa2010439" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019ed0e6-a83c-7768-9d49-19674d64e443" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-7550-b461-be3aa2010439" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-7550-b461-be3aa2010439_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-7550-b461-be3aa2010439" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-7550-b461-be3aa2010439_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-7208-9764-8a5240cbdef7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019ed0e6-a83c-7550-b461-be3aa2010439" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-7208-9764-8a5240cbdef7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_019ed0e6-a83c-7b5c-a5f4-053490ab3b26" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PerformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019ed0e6-a83c-7208-9764-8a5240cbdef7" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_019ed0e6-a83c-7b5c-a5f4-053490ab3b26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7eaa-8fba-9e2a8b781989" 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_019ed0e6-a83c-7768-9d49-19674d64e443" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019ed0e6-a83c-7eaa-8fba-9e2a8b781989" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7eaa-8fba-9e2a8b781989_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_019ed0e6-a83c-7eaa-8fba-9e2a8b781989" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7eaa-8fba-9e2a8b781989_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7c7b-98fe-7114aafaf47f" 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_019ed0e6-a83c-7eaa-8fba-9e2a8b781989" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7c7b-98fe-7114aafaf47f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7f0c-b8e5-817796947543" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019ed0e6-a83c-7c7b-98fe-7114aafaf47f" xlink:to="loc_ahfc_DealerLoanMember_019ed0e6-a83c-7f0c-b8e5-817796947543" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89" 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_019ed0e6-a83c-7768-9d49-19674d64e443" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89_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_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7607-ba3d-c9535f22b43a" 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_019ed0e6-a83c-7cf6-a56a-8cc4b7b7af89" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7607-ba3d-c9535f22b43a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CommercialLoansMember_019ed0e6-a83c-7eb5-b6b0-29f21663d371" xlink:href="ahfc-20260630.xsd#ahfc_CommercialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7607-ba3d-c9535f22b43a" xlink:to="loc_ahfc_CommercialLoansMember_019ed0e6-a83c-7eb5-b6b0-29f21663d371" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_WholesaleFlooringMember_019ed0e6-a83c-7ab2-97d4-fefc8e893b2e" xlink:href="ahfc-20260630.xsd#ahfc_WholesaleFlooringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_019ed0e6-a83c-7607-ba3d-c9535f22b43a" xlink:to="loc_ahfc_WholesaleFlooringMember_019ed0e6-a83c-7ab2-97d4-fefc8e893b2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_019ed0e6-a83c-75fc-950c-c0c304b500c3" 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_019ed0e6-a83c-7768-9d49-19674d64e443" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_019ed0e6-a83c-75fc-950c-c0c304b500c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-75fc-950c-c0c304b500c3_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_019ed0e6-a83c-75fc-950c-c0c304b500c3" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-75fc-950c-c0c304b500c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7401-99d9-841ad2e707bc" 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_019ed0e6-a83c-75fc-950c-c0c304b500c3" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7401-99d9-841ad2e707bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_GroupIMember_019ed0e6-a83c-7737-994e-a5b8c6eb17bb" xlink:href="ahfc-20260630.xsd#ahfc_GroupIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7401-99d9-841ad2e707bc" xlink:to="loc_ahfc_GroupIMember_019ed0e6-a83c-7737-994e-a5b8c6eb17bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_GroupIIMember_019ed0e6-a83c-735f-94f8-395a3aec67cb" xlink:href="ahfc-20260630.xsd#ahfc_GroupIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7401-99d9-841ad2e707bc" xlink:to="loc_ahfc_GroupIIMember_019ed0e6-a83c-735f-94f8-395a3aec67cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_GradeIIIMember_019ed0e6-a83c-7069-a43f-c7414e5afa01" xlink:href="ahfc-20260630.xsd#ahfc_GradeIIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_019ed0e6-a83c-7401-99d9-841ad2e707bc" xlink:to="loc_ahfc_GradeIIIMember_019ed0e6-a83c-7069-a43f-c7414e5afa01" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:href="ahfc-20260630.xsd#ahfc_CurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" xlink:to="loc_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-78db-ad44-507dee6ece07" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-78db-ad44-507dee6ece07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-7274-a6ff-ef14c3e3c989" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-7274-a6ff-ef14c3e3c989" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7f72-95ba-0f29104fdaeb" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7f72-95ba-0f29104fdaeb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-71bb-a5e3-3579697a5805" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-71bb-a5e3-3579697a5805" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7c34-93b6-df39dba3ea4d" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7c34-93b6-df39dba3ea4d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7632-b22b-c64a782dbd48" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7632-b22b-c64a782dbd48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019ed0e6-a83c-7973-95da-57d3dd95d80e" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019ed0e6-a83c-7973-95da-57d3dd95d80e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-765b-becd-d87c5bf180ee" 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_ahfc_CurrentYearAbstract_019ed0e6-a83c-798b-b9cb-a043871a642f" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-765b-becd-d87c5bf180ee" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:href="ahfc-20260630.xsd#ahfc_CurrentPeriodGrossWriteOffAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" xlink:to="loc_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-7000-8a58-27efe2d65b1d" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-7000-8a58-27efe2d65b1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7e5f-97cc-4087a50366fe" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7e5f-97cc-4087a50366fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7a04-a815-b0f9d478c739" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7a04-a815-b0f9d478c739" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-706a-9a80-371561d727da" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-706a-9a80-371561d727da" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7480-a89e-0a3934c088e3" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7480-a89e-0a3934c088e3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7552-949e-fc4d356b80ba" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7552-949e-fc4d356b80ba" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019ed0e6-a83c-79cf-ad23-471cf206eee0" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019ed0e6-a83c-79cf-ad23-471cf206eee0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7ecb-9efe-3670010fb85a" 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_ahfc_CurrentPeriodGrossWriteOffAbstract_019ed0e6-a83c-752e-aadb-1d8c04435258" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7ecb-9efe-3670010fb85a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PriorYearAbstract_019ed0e6-a83c-7a1a-82ac-5428266f2dfa" xlink:href="ahfc-20260630.xsd#ahfc_PriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" xlink:to="loc_ahfc_PriorYearAbstract_019ed0e6-a83c-7a1a-82ac-5428266f2dfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019ed0e6-a83c-75bd-ba38-7c8fee041c6b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019ed0e6-a83c-75b9-8300-6d6c884aa2eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019ed0e6-a83c-7b31-af46-45786ae54477" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019ed0e6-a83c-73b8-9b86-b038d7fa1dea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019ed0e6-a83c-724e-9d39-8070f4fb1220" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019ed0e6-a83c-71d7-8cd9-5e059239f94c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_019ed0e6-a83c-77ef-af74-af0abb57d54c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019ed0e6-a83c-725a-8518-3e1580ef9e0f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PriorPeriodGrossWriteOffAbstract_019ed0e6-a83c-7037-aadd-bc4f14f2f6cb" xlink:href="ahfc-20260630.xsd#ahfc_PriorPeriodGrossWriteOffAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019ed0e6-a83c-7d64-8173-7fc2619b0c5b" xlink:to="loc_ahfc_PriorPeriodGrossWriteOffAbstract_019ed0e6-a83c-7037-aadd-bc4f14f2f6cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_019ed0e6-a83c-790e-a7e8-cd8cfa4b261d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7670-8fb0-fbe0a64b3dff" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-74d5-b1e1-d3af24677d7b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7d55-b773-dd237acef08b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-7d82-9121-424b2e2c5690" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_019ed0e6-a83c-75b8-9a16-8883231f9ee8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_019ed0e6-a83c-7c3b-acc8-4de2bd6174c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019ed0e6-a83c-7645-b743-e263a766d391" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/InvestmentinOperatingLeasesSummaryofLeasedVehicleExpensesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#InvestmentinOperatingLeasesSummaryofLeasedVehicleExpensesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/InvestmentinOperatingLeasesSummaryofLeasedVehicleExpensesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_019ed0e6-a83c-7fa7-8e37-52aabeddaab0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_019ed0e6-a83c-7fa7-8e37-52aabeddaab0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019ed0e6-a83c-7c79-9e7c-2044a26daf23" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_019ed0e6-a83c-7fa7-8e37-52aabeddaab0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019ed0e6-a83c-7c79-9e7c-2044a26daf23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019ed0e6-a83c-7c79-9e7c-2044a26daf23_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019ed0e6-a83c-7c79-9e7c-2044a26daf23" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019ed0e6-a83c-7c79-9e7c-2044a26daf23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019ed0e6-a83c-7d44-92f5-6deb40c282a3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_019ed0e6-a83c-7c79-9e7c-2044a26daf23" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019ed0e6-a83c-7d44-92f5-6deb40c282a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_LeasedVehiclesMember_019ed0e6-a83c-7638-8220-dda0f2cfbe46" xlink:href="ahfc-20260630.xsd#ahfc_LeasedVehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_019ed0e6-a83c-7d44-92f5-6deb40c282a3" xlink:to="loc_ahfc_LeasedVehiclesMember_019ed0e6-a83c-7638-8220-dda0f2cfbe46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease_019ed0e6-a83c-7fe0-8ef6-f9558eceecf4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:to="loc_us-gaap_OperatingLeasesIncomeStatementDepreciationExpenseOnPropertySubjectToOrHeldForLease_019ed0e6-a83c-7fe0-8ef6-f9558eceecf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OperatingLeaseInitialDirectCostExpenseAndOtherLessorCosts_019ed0e6-a83c-7467-9db4-08861d2218cc" xlink:href="ahfc-20260630.xsd#ahfc_OperatingLeaseInitialDirectCostExpenseAndOtherLessorCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:to="loc_ahfc_OperatingLeaseInitialDirectCostExpenseAndOtherLessorCosts_019ed0e6-a83c-7467-9db4-08861d2218cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_019ed0e6-a83c-7398-9a8d-8a8aff0fe15a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_019ed0e6-a83c-7398-9a8d-8a8aff0fe15a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_LessorOperatingLeaseExpense_019ed0e6-a83c-7d54-a509-e10ea5b028ea" xlink:href="ahfc-20260630.xsd#ahfc_LessorOperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_019ed0e6-a83c-7b33-9dae-907bd660dd65" xlink:to="loc_ahfc_LessorOperatingLeaseExpense_019ed0e6-a83c-7d54-a509-e10ea5b028ea" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/DebtSummaryofOutstandingDebtNetofDiscountsandFeesWeightedAverageContractualInterestRatesandRangeofContractualInterestRatesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#DebtSummaryofOutstandingDebtNetofDiscountsandFeesWeightedAverageContractualInterestRatesandRangeofContractualInterestRatesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/DebtSummaryofOutstandingDebtNetofDiscountsandFeesWeightedAverageContractualInterestRatesandRangeofContractualInterestRatesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019ed0e6-a903-7c23-bbec-88e3cb1ece19" 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_019ed0e6-a903-7db5-9b12-9a526e3ce8bc" 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_019ed0e6-a903-7c23-bbec-88e3cb1ece19" xlink:to="loc_us-gaap_DebtInstrumentTable_019ed0e6-a903-7db5-9b12-9a526e3ce8bc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019ed0e6-a903-729c-a2db-455e811f2779" 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_019ed0e6-a903-7db5-9b12-9a526e3ce8bc" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019ed0e6-a903-729c-a2db-455e811f2779" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-729c-a2db-455e811f2779_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_019ed0e6-a903-729c-a2db-455e811f2779" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-729c-a2db-455e811f2779_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" 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_019ed0e6-a903-729c-a2db-455e811f2779" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_019ed0e6-a903-7fbe-8da8-fc9fe306f24e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" xlink:to="loc_us-gaap_CommercialPaperMember_019ed0e6-a903-7fbe-8da8-fc9fe306f24e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_BankLoansMember_019ed0e6-a903-7ae2-9236-e7a31025eb4d" xlink:href="ahfc-20260630.xsd#ahfc_BankLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" xlink:to="loc_ahfc_BankLoansMember_019ed0e6-a903-7ae2-9236-e7a31025eb4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PublicMediumTermNoteProgramMember_019ed0e6-a903-7f66-826e-b95b91f4ac62" xlink:href="ahfc-20260630.xsd#ahfc_PublicMediumTermNoteProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" xlink:to="loc_ahfc_PublicMediumTermNoteProgramMember_019ed0e6-a903-7f66-826e-b95b91f4ac62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OtherDebtMember_019ed0e6-a903-7e27-af1d-35b1be1d532b" xlink:href="ahfc-20260630.xsd#ahfc_OtherDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019ed0e6-a903-725e-b0fc-acba72987551" xlink:to="loc_ahfc_OtherDebtMember_019ed0e6-a903-7e27-af1d-35b1be1d532b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtMember_019ed0e6-a903-7913-971c-ce160723e870" 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_019ed0e6-a903-725e-b0fc-acba72987551" xlink:to="loc_us-gaap_SecuredDebtMember_019ed0e6-a903-7913-971c-ce160723e870" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_019ed0e6-a903-7b9d-8c3f-0526a76a80a2" 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_DebtInstrumentTable_019ed0e6-a903-7db5-9b12-9a526e3ce8bc" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_019ed0e6-a903-7b9d-8c3f-0526a76a80a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019ed0e6-a903-7b9d-8c3f-0526a76a80a2_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_019ed0e6-a903-7b9d-8c3f-0526a76a80a2" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019ed0e6-a903-7b9d-8c3f-0526a76a80a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_019ed0e6-a903-73f7-86cc-d2b9ce82cfef" 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_019ed0e6-a903-7b9d-8c3f-0526a76a80a2" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_019ed0e6-a903-73f7-86cc-d2b9ce82cfef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtMember_019ed0e6-a903-7225-9bf0-d354bae0f2dd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ShortTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_019ed0e6-a903-73f7-86cc-d2b9ce82cfef" xlink:to="loc_us-gaap_ShortTermDebtMember_019ed0e6-a903-7225-9bf0-d354bae0f2dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnsecuredDebt_019ed0e6-a903-766f-b1c4-af059f20f1f4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_UnsecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ed0e6-a903-7c23-bbec-88e3cb1ece19" xlink:to="loc_us-gaap_UnsecuredDebt_019ed0e6-a903-766f-b1c4-af059f20f1f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019ed0e6-a903-78bc-b2d2-edcd4668d27f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ed0e6-a903-7c23-bbec-88e3cb1ece19" xlink:to="loc_us-gaap_SecuredDebt_019ed0e6-a903-78bc-b2d2-edcd4668d27f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ed0e6-a903-7bc2-ae30-39f733b0f17f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019ed0e6-a903-7c23-bbec-88e3cb1ece19" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_019ed0e6-a903-7bc2-ae30-39f733b0f17f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_019ed0e6-a903-7451-936f-50f9ad6856ad" 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_019ed0e6-a903-7c23-bbec-88e3cb1ece19" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_019ed0e6-a903-7451-936f-50f9ad6856ad" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/DebtNarrativeDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#DebtNarrativeDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/DebtNarrativeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" 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_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" 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_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_DebtInstrumentTable_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019efd77-39f6-7c09-9062-9e09ca530474" 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_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019efd77-39f6-7c09-9062-9e09ca530474" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-7c09-9062-9e09ca530474_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_019efd77-39f6-7c09-9062-9e09ca530474" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-7c09-9062-9e09ca530474_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-755f-a9bb-e0d21d25b349" 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_019efd77-39f6-7c09-9062-9e09ca530474" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-755f-a9bb-e0d21d25b349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_019efd77-39f6-788b-8fb4-05fc09980b65" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaperMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-755f-a9bb-e0d21d25b349" xlink:to="loc_us-gaap_CommercialPaperMember_019efd77-39f6-788b-8fb4-05fc09980b65" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_PublicMediumTermNoteProgramMember_019efd77-83cf-7b71-bbad-1b92c8856f07" xlink:href="ahfc-20260630.xsd#ahfc_PublicMediumTermNoteProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019efd77-39f6-755f-a9bb-e0d21d25b349" xlink:to="loc_ahfc_PublicMediumTermNoteProgramMember_019efd77-83cf-7b71-bbad-1b92c8856f07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019efd77-39f6-7d74-9812-590d2c966b71" 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_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" xlink:to="loc_us-gaap_DebtInstrumentAxis_019efd77-39f6-7d74-9812-590d2c966b71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7d74-9812-590d2c966b71_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_019efd77-39f6-7d74-9812-590d2c966b71" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7d74-9812-590d2c966b71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" 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_019efd77-39f6-7d74-9812-590d2c966b71" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OtherCreditAgreementsMember_019efd77-39f6-78a3-81f4-7ea303f177a5" xlink:href="ahfc-20260630.xsd#ahfc_OtherCreditAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_OtherCreditAgreementsMember_019efd77-39f6-78a3-81f4-7ea303f177a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesMember_019efd77-83cf-7cc4-97ea-f527e6104c20" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesMember_019efd77-83cf-7cc4-97ea-f527e6104c20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesWithThreeHundredsSixtyFourDayCreditAgreementMember_019efd77-83cf-7384-92eb-b0b9a60e9fa7" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesWithThreeHundredsSixtyFourDayCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesWithThreeHundredsSixtyFourDayCreditAgreementMember_019efd77-83cf-7384-92eb-b0b9a60e9fa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesWithThreeYearCreditAgreementMember_019efd77-83cf-77a5-bfe4-14f55cc56141" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesWithThreeYearCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesWithThreeYearCreditAgreementMember_019efd77-83cf-77a5-bfe4-14f55cc56141" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesWithFiveYearCreditAgreementMember_019efd77-83cf-7b8f-84c1-ecbca5522ae1" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesWithFiveYearCreditAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesWithFiveYearCreditAgreementMember_019efd77-83cf-7b8f-84c1-ecbca5522ae1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesWithOneYearRevolvingTermMember_019efd77-83cf-7fc3-9c19-c56979b9ac24" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesWithOneYearRevolvingTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesWithOneYearRevolvingTermMember_019efd77-83cf-7fc3-9c19-c56979b9ac24" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SyndicatedBankCreditFacilitiesWithFiveYearRevolvingTermMember_019efd77-83cf-7754-ac15-e5ef08d84f50" xlink:href="ahfc-20260630.xsd#ahfc_SyndicatedBankCreditFacilitiesWithFiveYearRevolvingTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019efd77-39f6-7c8d-b0b0-85376d68abc2" xlink:to="loc_ahfc_SyndicatedBankCreditFacilitiesWithFiveYearRevolvingTermMember_019efd77-83cf-7754-ac15-e5ef08d84f50" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019efd77-39f6-7525-b402-4cc21526ef39" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019efd77-39f6-7525-b402-4cc21526ef39" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019efd77-39f6-7525-b402-4cc21526ef39_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019efd77-39f6-7525-b402-4cc21526ef39" xlink:to="loc_us-gaap_RelatedPartyDomain_019efd77-39f6-7525-b402-4cc21526ef39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019efd77-39f6-75a8-b1df-96e36b030f5b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019efd77-39f6-7525-b402-4cc21526ef39" xlink:to="loc_us-gaap_RelatedPartyDomain_019efd77-39f6-75a8-b1df-96e36b030f5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019efd77-39f6-7b1a-bdaa-eaa931c026f1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019efd77-39f6-75a8-b1df-96e36b030f5b" xlink:to="loc_us-gaap_RelatedPartyMember_019efd77-39f6-7b1a-bdaa-eaa931c026f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019efd77-83cf-78e0-907e-79cae607c957" 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_DebtInstrumentTable_019ed0e6-a903-7ca6-90c1-f6cb2aa2fc13" xlink:to="loc_dei_LegalEntityAxis_019efd77-83cf-78e0-907e-79cae607c957" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019efd77-83cf-78e0-907e-79cae607c957_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_019efd77-83cf-78e0-907e-79cae607c957" xlink:to="loc_dei_EntityDomain_019efd77-83cf-78e0-907e-79cae607c957_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019efd77-83cf-7c35-b23c-95abbeaf1e6d" 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_019efd77-83cf-78e0-907e-79cae607c957" xlink:to="loc_dei_EntityDomain_019efd77-83cf-7c35-b23c-95abbeaf1e6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_AmericanHondaFinanceCorporationMember_019efd77-83cf-721f-bad6-c46f987a7af8" xlink:href="ahfc-20260630.xsd#ahfc_AmericanHondaFinanceCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019efd77-83cf-7c35-b23c-95abbeaf1e6d" xlink:to="loc_ahfc_AmericanHondaFinanceCorporationMember_019efd77-83cf-721f-bad6-c46f987a7af8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_HondaCanadaFinanceIncorporatedMember_019efd77-83cf-7d5c-aa88-854095531ae4" xlink:href="ahfc-20260630.xsd#ahfc_HondaCanadaFinanceIncorporatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019efd77-83cf-7c35-b23c-95abbeaf1e6d" xlink:to="loc_ahfc_HondaCanadaFinanceIncorporatedMember_019efd77-83cf-7d5c-aa88-854095531ae4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_019efd77-39f6-7004-8fbb-55623c9e63d6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtPercentageBearingVariableInterestAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingVariableInterestAmount_019efd77-39f6-7004-8fbb-55623c9e63d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_019efd77-39f6-784d-a365-fbe9df999e18" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LongtermDebtPercentageBearingFixedInterestAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LongtermDebtPercentageBearingFixedInterestAmount_019efd77-39f6-784d-a365-fbe9df999e18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_019efd77-39f6-7a73-b99c-b5d7a7bbdf38" 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_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_ShortTermBorrowings_019efd77-39f6-7a73-b99c-b5d7a7bbdf38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019efd77-39f6-73b0-a50e-b26461494614" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019efd77-39f6-73b0-a50e-b26461494614" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_019efd77-39f6-743c-bd06-fc2e4d46cf25" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_DebtInstrumentTerm_019efd77-39f6-743c-bd06-fc2e4d46cf25" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_019efd77-39f6-72ed-84d7-c0baf262c461" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityAverageOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LineOfCreditFacilityAverageOutstandingAmount_019efd77-39f6-72ed-84d7-c0baf262c461" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount_019efd77-39f6-7c00-8e9f-d32c645cab44" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumMonthendOutstandingAmount_019efd77-39f6-7c00-8e9f-d32c645cab44" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_019efd77-39f6-7311-b53b-467dc61eeafe" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_InterestExpenseBorrowings_019efd77-39f6-7311-b53b-467dc61eeafe" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_019efd77-83cf-7d4a-80af-e10d90accd04" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LineOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019efd77-39f6-74c1-8715-025ce5ce3295" xlink:to="loc_us-gaap_LineOfCredit_019efd77-83cf-7d4a-80af-e10d90accd04" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/DerivativeInstrumentsSummaryofNotionalBalancesandFairValuesofDerivativesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#DerivativeInstrumentsSummaryofNotionalBalancesandFairValuesofDerivativesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/DerivativeInstrumentsSummaryofNotionalBalancesandFairValuesofDerivativesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019ed0e6-a903-7d78-ac08-65639fc44911" 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_019ed0e6-a903-7474-9d29-6a786199823c" 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_019ed0e6-a903-7d78-ac08-65639fc44911" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019ed0e6-a903-7474-9d29-6a786199823c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-794d-9a5a-3f259b4762ba" 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_019ed0e6-a903-7474-9d29-6a786199823c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-794d-9a5a-3f259b4762ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-794d-9a5a-3f259b4762ba_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_019ed0e6-a903-794d-9a5a-3f259b4762ba" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-794d-9a5a-3f259b4762ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-73d4-a7a2-5517d6845f0a" 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_019ed0e6-a903-794d-9a5a-3f259b4762ba" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-73d4-a7a2-5517d6845f0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-7306-b4db-3f044192dc1a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-73d4-a7a2-5517d6845f0a" xlink:to="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-7306-b4db-3f044192dc1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-75bf-bae2-fbbf1369ea33" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-73d4-a7a2-5517d6845f0a" xlink:to="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-75bf-bae2-fbbf1369ea33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019ed0e6-a903-72b0-a5b4-575ab1c2f8f4" 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_019ed0e6-a903-7d78-ac08-65639fc44911" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019ed0e6-a903-72b0-a5b4-575ab1c2f8f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019ed0e6-a903-7d78-ac08-65639fc44911" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019ed0e6-a903-7d72-9a91-73ec3f071247" 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_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019ed0e6-a903-7d72-9a91-73ec3f071247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DerivativeAssetCollateralPosted_019ed0e6-a903-7151-84f4-da538a6ab6c0" xlink:href="ahfc-20260630.xsd#ahfc_DerivativeAssetCollateralPosted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:to="loc_ahfc_DerivativeAssetCollateralPosted_019ed0e6-a903-7151-84f4-da538a6ab6c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019ed0e6-a903-757e-960c-618bc319ac9f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019ed0e6-a903-757e-960c-618bc319ac9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019ed0e6-a903-7138-a284-3c6353f94137" 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_DerivativeAssetsAbstract_019efd7e-5755-7b54-ae7e-1ebc9be505b5" xlink:to="loc_us-gaap_DerivativeAssets_019ed0e6-a903-7138-a284-3c6353f94137" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019ed0e6-a903-7d78-ac08-65639fc44911" xlink:to="loc_us-gaap_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ed0e6-a903-7c70-961c-59cde6fe8ed4" 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_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019ed0e6-a903-7c70-961c-59cde6fe8ed4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DerivativeLiabilityCollateralPosted_019ed0e6-a903-7337-967b-fc744798c86e" xlink:href="ahfc-20260630.xsd#ahfc_DerivativeLiabilityCollateralPosted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:to="loc_ahfc_DerivativeLiabilityCollateralPosted_019ed0e6-a903-7337-967b-fc744798c86e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019ed0e6-a903-7b6e-881d-d27f5d453968" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:to="loc_us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset_019ed0e6-a903-7b6e-881d-d27f5d453968" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019ed0e6-a903-789e-83b0-513ea4f6a15e" 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_DerivativeLiabilitiesAbstract_019efd7f-6d2f-7b86-9d85-5dcce6d810cf" xlink:to="loc_us-gaap_DerivativeLiabilities_019ed0e6-a903-789e-83b0-513ea4f6a15e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/DerivativeInstrumentsSummaryofIncomeStatementImpactofDerivativeInstrumentsDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#DerivativeInstrumentsSummaryofIncomeStatementImpactofDerivativeInstrumentsDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/DerivativeInstrumentsSummaryofIncomeStatementImpactofDerivativeInstrumentsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019ed0e6-a903-77f0-9f8e-a803b5669f84" 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_019ed0e6-a903-73c2-8f40-5a8d8539e1d5" 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_019ed0e6-a903-77f0-9f8e-a803b5669f84" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_019ed0e6-a903-73c2-8f40-5a8d8539e1d5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-7551-9004-e1d2c32eb99f" 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_019ed0e6-a903-73c2-8f40-5a8d8539e1d5" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-7551-9004-e1d2c32eb99f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7551-9004-e1d2c32eb99f_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_019ed0e6-a903-7551-9004-e1d2c32eb99f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7551-9004-e1d2c32eb99f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7251-a9c3-8e37b3072598" 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_019ed0e6-a903-7551-9004-e1d2c32eb99f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7251-a9c3-8e37b3072598" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-75cd-819f-039e80762ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7251-a9c3-8e37b3072598" xlink:to="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-75cd-819f-039e80762ee0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-7bec-a560-76960385149d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-7251-a9c3-8e37b3072598" xlink:to="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-7bec-a560-76960385149d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ed0e6-a903-7675-8565-34871469f4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_019ed0e6-a903-77f0-9f8e-a803b5669f84" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ed0e6-a903-7675-8565-34871469f4c6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesSummaryofIncomeStatementImpactofTransactionswithParentandAffiliatedCompaniesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#TransactionsInvolvingRelatedPartiesSummaryofIncomeStatementImpactofTransactionswithParentandAffiliatedCompaniesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesSummaryofIncomeStatementImpactofTransactionswithParentandAffiliatedCompaniesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7332-aed3-15f3aa5a569f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-71f5-9426-83e83cc68f88" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7332-aed3-15f3aa5a569f" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-71f5-9426-83e83cc68f88" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-75ac-912e-b7981e0f42c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-71f5-9426-83e83cc68f88" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-75ac-912e-b7981e0f42c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-75ac-912e-b7981e0f42c0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-75ac-912e-b7981e0f42c0" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-75ac-912e-b7981e0f42c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-77c7-919f-60614f4a7d80" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-75ac-912e-b7981e0f42c0" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-77c7-919f-60614f4a7d80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ed0e6-a903-71ee-b797-c63a54f3a1e2" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-77c7-919f-60614f4a7d80" xlink:to="loc_srt_AffiliatedEntityMember_019ed0e6-a903-71ee-b797-c63a54f3a1e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019ed0e6-a903-70d1-9482-dcffafe0a19c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-77c7-919f-60614f4a7d80" xlink:to="loc_us-gaap_RelatedPartyMember_019ed0e6-a903-70d1-9482-dcffafe0a19c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-77da-b4f3-b7bbbe6e3e56" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7332-aed3-15f3aa5a569f" xlink:to="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-77da-b4f3-b7bbbe6e3e56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_019ed0e6-a903-7e7f-aee0-35918dcec60b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-77da-b4f3-b7bbbe6e3e56" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_019ed0e6-a903-7e7f-aee0-35918dcec60b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebtAbstract_019ed0e6-a903-7b68-a9df-d90c651e0bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseDebtAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7332-aed3-15f3aa5a569f" xlink:to="loc_us-gaap_InterestExpenseDebtAbstract_019ed0e6-a903-7b68-a9df-d90c651e0bbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseBorrowings_019ed0e6-a903-740b-9e64-ffa6f1f349c0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestExpenseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseDebtAbstract_019ed0e6-a903-7b68-a9df-d90c651e0bbc" xlink:to="loc_us-gaap_InterestExpenseBorrowings_019ed0e6-a903-740b-9e64-ffa6f1f349c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7332-aed3-15f3aa5a569f" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartySupportCompensationAgreementFees_019ed0e6-a903-7836-9ec4-24b2c72733e6" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartySupportCompensationAgreementFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:to="loc_ahfc_RelatedPartySupportCompensationAgreementFees_019ed0e6-a903-7836-9ec4-24b2c72733e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartyBenefitPlanExpense_019ed0e6-a903-7218-9da5-2930decbb9ec" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartyBenefitPlanExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:to="loc_ahfc_RelatedPartyBenefitPlanExpense_019ed0e6-a903-7218-9da5-2930decbb9ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartySharedServicesFee_019ed0e6-a903-79c6-9e4d-4562cf90cfe7" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartySharedServicesFee"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:to="loc_ahfc_RelatedPartySharedServicesFee_019ed0e6-a903-79c6-9e4d-4562cf90cfe7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019ed0e6-a903-7c0c-a816-606063a0c289" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GeneralAndAdministrativeExpenseAbstract_019ed0e6-a903-7179-b091-08b2e2a85e8e" xlink:to="loc_us-gaap_OperatingLeaseExpense_019ed0e6-a903-7c0c-a816-606063a0c289" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesSummaryofBalanceSheetImpactofTransactionswithParentandAffiliatedCompaniesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#TransactionsInvolvingRelatedPartiesSummaryofBalanceSheetImpactofTransactionswithParentandAffiliatedCompaniesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesSummaryofBalanceSheetImpactofTransactionswithParentandAffiliatedCompaniesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7d2f-a107-1963f166dd27" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-77b2-8485-5cd6a6163a79" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-7d2f-a107-1963f166dd27" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-77b2-8485-5cd6a6163a79" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-719c-a700-8e5a0b4d618b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-77b2-8485-5cd6a6163a79" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-719c-a700-8e5a0b4d618b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-719c-a700-8e5a0b4d618b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-719c-a700-8e5a0b4d618b" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-719c-a700-8e5a0b4d618b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7d18-9039-6342f3994ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-719c-a700-8e5a0b4d618b" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7d18-9039-6342f3994ffd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AffiliatedEntityMember_019ed0e6-a903-7121-a39b-044c62a8b54e" xlink:href="https://xbrl.fasb.org/srt/2026/elts/srt-2026.xsd#srt_AffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7d18-9039-6342f3994ffd" xlink:to="loc_srt_AffiliatedEntityMember_019ed0e6-a903-7121-a39b-044c62a8b54e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_019ed0e6-a903-7a20-8324-9d27da49386d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7d18-9039-6342f3994ffd" xlink:to="loc_us-gaap_RelatedPartyMember_019ed0e6-a903-7a20-8324-9d27da49386d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7c6b-82a1-d27903017fc1" 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_RelatedPartyTransactionLineItems_019ed0e6-a903-7d2f-a107-1963f166dd27" xlink:to="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7c6b-82a1-d27903017fc1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNetAbstract_019ed0e6-a903-713e-a213-faa137d9f687" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesReceivableNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7c6b-82a1-d27903017fc1" xlink:to="loc_us-gaap_NotesReceivableNetAbstract_019ed0e6-a903-713e-a213-faa137d9f687" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartyFinanceReceivablesUnearnedIncome_019ed0e6-a903-7676-9edc-f9ddd752542c" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartyFinanceReceivablesUnearnedIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NotesReceivableNetAbstract_019ed0e6-a903-713e-a213-faa137d9f687" xlink:to="loc_ahfc_RelatedPartyFinanceReceivablesUnearnedIncome_019ed0e6-a903-7676-9edc-f9ddd752542c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_InvestmentInOperatingLeasesNetAbstract_019ed0e6-a903-7af2-90e3-bca75e202930" xlink:href="ahfc-20260630.xsd#ahfc_InvestmentInOperatingLeasesNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7c6b-82a1-d27903017fc1" xlink:to="loc_ahfc_InvestmentInOperatingLeasesNetAbstract_019ed0e6-a903-7af2-90e3-bca75e202930" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartyUnearnedSubsidyIncome_019ed0e6-a903-7edf-918e-4346a0243f47" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartyUnearnedSubsidyIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_InvestmentInOperatingLeasesNetAbstract_019ed0e6-a903-7af2-90e3-bca75e202930" xlink:to="loc_ahfc_RelatedPartyUnearnedSubsidyIncome_019ed0e6-a903-7edf-918e-4346a0243f47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReceivables_019ed0e6-a903-7163-b725-1d0c5790a582" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7c6b-82a1-d27903017fc1" xlink:to="loc_us-gaap_OtherReceivables_019ed0e6-a903-7163-b725-1d0c5790a582" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7016-929f-5349b6c219be" 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_RelatedPartyTransactionLineItems_019ed0e6-a903-7d2f-a107-1963f166dd27" xlink:to="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7016-929f-5349b6c219be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ed0e6-a903-71a0-b663-b312e1903bc2" 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_019ed0e6-a903-7016-929f-5349b6c219be" xlink:to="loc_us-gaap_OtherLiabilities_019ed0e6-a903-71a0-b663-b312e1903bc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesAbstract_019ed0e6-a903-7ffa-b5e4-8061c8e23c17" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7016-929f-5349b6c219be" xlink:to="loc_us-gaap_OtherLiabilitiesAbstract_019ed0e6-a903-7ffa-b5e4-8061c8e23c17" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RelatedPartyAccruedBenefitExpense_019ed0e6-a903-70eb-b641-aba24d0069b8" xlink:href="ahfc-20260630.xsd#ahfc_RelatedPartyAccruedBenefitExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesAbstract_019ed0e6-a903-7ffa-b5e4-8061c8e23c17" xlink:to="loc_ahfc_RelatedPartyAccruedBenefitExpense_019ed0e6-a903-70eb-b641-aba24d0069b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019efd85-16e1-79e9-8215-0886957fd380" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesAbstract_019ed0e6-a903-7ffa-b5e4-8061c8e23c17" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019efd85-16e1-79e9-8215-0886957fd380" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019ed0e6-a903-7edf-96ba-9862e33d2cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherLiabilitiesAbstract_019ed0e6-a903-7ffa-b5e4-8061c8e23c17" xlink:to="loc_us-gaap_OperatingLeaseLiability_019ed0e6-a903-7edf-96ba-9862e33d2cc0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesNarrativeDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#TransactionsInvolvingRelatedPartiesNarrativeDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/TransactionsInvolvingRelatedPartiesNarrativeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-717f-af86-cdf8bf27ea84" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-7e43-8bfd-783f6a2638d1" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-717f-af86-cdf8bf27ea84" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-7e43-8bfd-783f6a2638d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7ad2-834e-dea7a73fdb4e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-7e43-8bfd-783f6a2638d1" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7ad2-834e-dea7a73fdb4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7ad2-834e-dea7a73fdb4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7ad2-834e-dea7a73fdb4e" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7ad2-834e-dea7a73fdb4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7ad2-834e-dea7a73fdb4e" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_HMCMember_019ed0e6-a903-782d-9349-3dc47e533bf9" xlink:href="ahfc-20260630.xsd#ahfc_HMCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:to="loc_ahfc_HMCMember_019ed0e6-a903-782d-9349-3dc47e533bf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_AmericanHondaMotorCorporationIncMember_019ed0e6-a903-777a-8e0a-acd2c8089ba0" xlink:href="ahfc-20260630.xsd#ahfc_AmericanHondaMotorCorporationIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:to="loc_ahfc_AmericanHondaMotorCorporationIncMember_019ed0e6-a903-777a-8e0a-acd2c8089ba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_AmericanHondaFinanceCorporationMember_019ed0e6-a903-7078-92cd-ada45c4a8dff" xlink:href="ahfc-20260630.xsd#ahfc_AmericanHondaFinanceCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:to="loc_ahfc_AmericanHondaFinanceCorporationMember_019ed0e6-a903-7078-92cd-ada45c4a8dff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_HondaCanadaIncorporatedMember_019ed0e6-a903-717c-9d06-09512905848c" xlink:href="ahfc-20260630.xsd#ahfc_HondaCanadaIncorporatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-76e3-a433-763e430daaa2" xlink:to="loc_ahfc_HondaCanadaIncorporatedMember_019ed0e6-a903-717c-9d06-09512905848c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019ed0e6-a903-70b1-9706-6f38e71543ba" 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_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-7e43-8bfd-783f6a2638d1" xlink:to="loc_dei_LegalEntityAxis_019ed0e6-a903-70b1-9706-6f38e71543ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019ed0e6-a903-70b1-9706-6f38e71543ba_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_019ed0e6-a903-70b1-9706-6f38e71543ba" xlink:to="loc_dei_EntityDomain_019ed0e6-a903-70b1-9706-6f38e71543ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019ed0e6-a903-7d0c-bb98-a67b910861b6" 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_019ed0e6-a903-70b1-9706-6f38e71543ba" xlink:to="loc_dei_EntityDomain_019ed0e6-a903-7d0c-bb98-a67b910861b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_AmericanHondaFinanceCorporationMember_019ed0e6-a903-7f64-8c13-9fa024ae2c21" xlink:href="ahfc-20260630.xsd#ahfc_AmericanHondaFinanceCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019ed0e6-a903-7d0c-bb98-a67b910861b6" xlink:to="loc_ahfc_AmericanHondaFinanceCorporationMember_019ed0e6-a903-7f64-8c13-9fa024ae2c21" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_HondaCanadaFinanceIncorporatedMember_019ed0e6-a903-71d2-a2c5-648c46d0beaa" xlink:href="ahfc-20260630.xsd#ahfc_HondaCanadaFinanceIncorporatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019ed0e6-a903-7d0c-bb98-a67b910861b6" xlink:to="loc_ahfc_HondaCanadaFinanceIncorporatedMember_019ed0e6-a903-71d2-a2c5-648c46d0beaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019efd89-e734-724e-9f59-aa7ce9921a99" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_019ed0e6-a903-7e43-8bfd-783f6a2638d1" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019efd89-e734-724e-9f59-aa7ce9921a99" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019efd89-e734-724e-9f59-aa7ce9921a99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019efd89-e734-724e-9f59-aa7ce9921a99" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019efd89-e734-724e-9f59-aa7ce9921a99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019efd89-e734-761d-990b-9a827b5acccd" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019efd89-e734-724e-9f59-aa7ce9921a99" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019efd89-e734-761d-990b-9a827b5acccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019efd8a-09af-7949-bc6c-0f6a456e4310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019efd89-e734-761d-990b-9a827b5acccd" xlink:to="loc_us-gaap_SubsequentEventMember_019efd8a-09af-7949-bc6c-0f6a456e4310" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_MinimumOwnershipInterestOfVotingStockRequiredBySupportAgreement_019ed0e6-a903-7562-9d15-3da7e0b328c1" xlink:href="ahfc-20260630.xsd#ahfc_MinimumOwnershipInterestOfVotingStockRequiredBySupportAgreement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_019ed0e6-a903-717f-af86-cdf8bf27ea84" xlink:to="loc_ahfc_MinimumOwnershipInterestOfVotingStockRequiredBySupportAgreement_019ed0e6-a903-7562-9d15-3da7e0b328c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019ed0e6-a903-79a7-8278-f856cd9d2574" 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_RelatedPartyTransactionLineItems_019ed0e6-a903-717f-af86-cdf8bf27ea84" xlink:to="loc_us-gaap_DividendsCommonStockCash_019ed0e6-a903-79a7-8278-f856cd9d2574" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/CommitmentsandContingenciesNarrativeDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#CommitmentsandContingenciesNarrativeDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/CommitmentsandContingenciesNarrativeDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:href="ahfc-20260630.xsd#ahfc_CommitmentsAndContingenciesDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CommitmentsAndContingenciesDisclosureTable_019ed0e6-a903-706f-8c56-fbaddcf9612c" xlink:href="ahfc-20260630.xsd#ahfc_CommitmentsAndContingenciesDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_ahfc_CommitmentsAndContingenciesDisclosureTable_019ed0e6-a903-706f-8c56-fbaddcf9612c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019ed0e6-a903-7d51-bdeb-2f661c03d00e" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureTable_019ed0e6-a903-706f-8c56-fbaddcf9612c" xlink:to="loc_us-gaap_CreditFacilityAxis_019ed0e6-a903-7d51-bdeb-2f661c03d00e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-7d51-bdeb-2f661c03d00e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019ed0e6-a903-7d51-bdeb-2f661c03d00e" xlink:to="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-7d51-bdeb-2f661c03d00e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-79c4-b7d6-f17c02ad4fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019ed0e6-a903-7d51-bdeb-2f661c03d00e" xlink:to="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-79c4-b7d6-f17c02ad4fb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019ed0e6-a903-7e92-b525-bf058b0fae15" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-79c4-b7d6-f17c02ad4fb4" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019ed0e6-a903-7e92-b525-bf058b0fae15" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_ConstructionOfAutomobileDealershipsMember_019ed0e6-a903-7a3b-a182-a2d443b31e7f" xlink:href="ahfc-20260630.xsd#ahfc_ConstructionOfAutomobileDealershipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019ed0e6-a903-79c4-b7d6-f17c02ad4fb4" xlink:to="loc_ahfc_ConstructionOfAutomobileDealershipsMember_019ed0e6-a903-7a3b-a182-a2d443b31e7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseExpense_019ed0e6-a903-7502-8704-9dc43f3efdc3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_us-gaap_OperatingLeaseExpense_019ed0e6-a903-7502-8704-9dc43f3efdc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019ed0e6-a903-7107-8ac2-06e631b55297" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_019ed0e6-a903-7107-8ac2-06e631b55297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019ed0e6-a903-777c-89e3-8e566d0a0432" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_019ed0e6-a903-777c-89e3-8e566d0a0432" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_LoansAndLeasesReceivableCommitmentsUnusedPortionOfLinesOfCredit_019ed0e6-a903-7a87-9b10-bb50a06798d6" xlink:href="ahfc-20260630.xsd#ahfc_LoansAndLeasesReceivableCommitmentsUnusedPortionOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_ahfc_LoansAndLeasesReceivableCommitmentsUnusedPortionOfLinesOfCredit_019ed0e6-a903-7a87-9b10-bb50a06798d6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_LoansAndLeasesReceivableCommitmentsRemainingUnfundedAmountOfConstructionLoans_019ed0e6-a903-71e9-9e21-255cf2f71dd1" xlink:href="ahfc-20260630.xsd#ahfc_LoansAndLeasesReceivableCommitmentsRemainingUnfundedAmountOfConstructionLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_CommitmentsAndContingenciesDisclosureLineItems_019ed0e6-a903-7c2f-8805-b5147711b4bf" xlink:to="loc_ahfc_LoansAndLeasesReceivableCommitmentsRemainingUnfundedAmountOfConstructionLoans_019ed0e6-a903-71e9-9e21-255cf2f71dd1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/SecuritizationsandVariableInterestEntitiesVIESummaryofCarryingAmountsofAssetsandLiabilitiesofConsolidatedSecuritizationTrustsDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#SecuritizationsandVariableInterestEntitiesVIESummaryofCarryingAmountsofAssetsandLiabilitiesofConsolidatedSecuritizationTrustsDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/SecuritizationsandVariableInterestEntitiesVIESummaryofCarryingAmountsofAssetsandLiabilitiesofConsolidatedSecuritizationTrustsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityLineItems_019ed0e6-a903-76ee-825e-7ddc62b9572f" 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_019ed0e6-a903-7670-b199-2c8b824c2576" 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_019ed0e6-a903-76ee-825e-7ddc62b9572f" xlink:to="loc_us-gaap_ScheduleOfVariableInterestEntitiesTable_019ed0e6-a903-7670-b199-2c8b824c2576" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019ed0e6-a903-7390-9b71-57f0717fdec9" 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_019ed0e6-a903-7670-b199-2c8b824c2576" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019ed0e6-a903-7390-9b71-57f0717fdec9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a903-7390-9b71-57f0717fdec9_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_019ed0e6-a903-7390-9b71-57f0717fdec9" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a903-7390-9b71-57f0717fdec9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a903-7095-a45e-d0a14825b324" 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_019ed0e6-a903-7390-9b71-57f0717fdec9" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019ed0e6-a903-7095-a45e-d0a14825b324" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ed0e6-a903-71a5-a33a-fcbd04030d66" 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_019ed0e6-a903-7095-a45e-d0a14825b324" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019ed0e6-a903-71a5-a33a-fcbd04030d66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ed0e6-a903-70a4-86c3-ae56d3111db9" 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_019ed0e6-a903-76ee-825e-7ddc62b9572f" xlink:to="loc_us-gaap_AssetsAbstract_019ed0e6-a903-70a4-86c3-ae56d3111db9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SecuritizedAssets_019ed0e6-a903-73c8-9bd8-ec34c392d475" xlink:href="ahfc-20260630.xsd#ahfc_SecuritizedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-70a4-86c3-ae56d3111db9" xlink:to="loc_ahfc_SecuritizedAssets_019ed0e6-a903-73c8-9bd8-ec34c392d475" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalents_019ed0e6-a903-7b91-853b-d52d00514118" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-70a4-86c3-ae56d3111db9" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalents_019ed0e6-a903-7b91-853b-d52d00514118" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneous_019ed0e6-a903-77f8-a2f4-c8438c766ee0" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherAssetsMiscellaneous"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-70a4-86c3-ae56d3111db9" xlink:to="loc_us-gaap_OtherAssetsMiscellaneous_019ed0e6-a903-77f8-a2f4-c8438c766ee0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-779f-87d1-129539ac6a94" 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_019ed0e6-a903-76ee-825e-7ddc62b9572f" xlink:to="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-779f-87d1-129539ac6a94" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019ed0e6-a903-797f-915c-f496b57b365d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-779f-87d1-129539ac6a94" xlink:to="loc_us-gaap_SecuredDebt_019ed0e6-a903-797f-915c-f496b57b365d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ed0e6-a903-74ec-9e9d-f79082920916" 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_019ed0e6-a903-779f-87d1-129539ac6a94" xlink:to="loc_us-gaap_OtherLiabilities_019ed0e6-a903-74ec-9e9d-f79082920916" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsAssetStatementOfFinancialPositionExtensibleList_019ed0e6-a903-7862-8961-b6d4b28b5a54" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RestrictedCashAndCashEquivalentsAssetStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableInterestEntityLineItems_019ed0e6-a903-76ee-825e-7ddc62b9572f" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsAssetStatementOfFinancialPositionExtensibleList_019ed0e6-a903-7862-8961-b6d4b28b5a54" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/OtherLiabilitiesDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#OtherLiabilitiesDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/OtherLiabilitiesDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:href="ahfc-20260630.xsd#ahfc_OtherLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OtherLiabilitiesTable_019ed0e6-a903-75da-a220-8673db75555a" xlink:href="ahfc-20260630.xsd#ahfc_OtherLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_ahfc_OtherLiabilitiesTable_019ed0e6-a903-75da-a220-8673db75555a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7228-8454-726ef7968310" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ahfc_OtherLiabilitiesTable_019ed0e6-a903-75da-a220-8673db75555a" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7228-8454-726ef7968310" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7228-8454-726ef7968310_default" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7228-8454-726ef7968310" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-7228-8454-726ef7968310_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-73b9-a438-fec7b77f0f76" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_019ed0e6-a903-7228-8454-726ef7968310" xlink:to="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-73b9-a438-fec7b77f0f76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_NonrelatedPartyAndAffiliatedEntityMember_019ed0e6-a903-74ae-9665-f4b7af81648b" xlink:href="ahfc-20260630.xsd#ahfc_NonrelatedPartyAndAffiliatedEntityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_019ed0e6-a903-73b9-a438-fec7b77f0f76" xlink:to="loc_ahfc_NonrelatedPartyAndAffiliatedEntityMember_019ed0e6-a903-74ae-9665-f4b7af81648b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerPayables_019ed0e6-a903-7dff-8d62-dbbd69b85963" xlink:href="ahfc-20260630.xsd#ahfc_DealerPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_ahfc_DealerPayables_019ed0e6-a903-7dff-8d62-dbbd69b85963" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019ed0e6-a903-73c4-af12-c58c2d9ea37c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_InterestPayableCurrentAndNoncurrent_019ed0e6-a903-73c4-af12-c58c2d9ea37c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019ed0e6-a903-76d2-8eff-4609552709b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019ed0e6-a903-76d2-8eff-4609552709b8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecurityDepositLiability_019ed0e6-a903-7dca-af38-56ba856e9fa3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecurityDepositLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_SecurityDepositLiability_019ed0e6-a903-7dca-af38-56ba856e9fa3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredRevenue_019ed0e6-a903-71b2-940f-ee6d8bb500dc" 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_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_DeferredRevenue_019ed0e6-a903-71b2-940f-ee6d8bb500dc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_019ed0e6-a903-72df-9e5a-2be8241f6354" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_OperatingLeaseLiability_019ed0e6-a903-72df-9e5a-2be8241f6354" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_019ed0e6-a903-7580-9527-8e46adeaccd3" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLeaseLiability_019ed0e6-a903-72df-9e5a-2be8241f6354" xlink:to="loc_us-gaap_OperatingLeaseLiabilityStatementOfFinancialPositionExtensibleList_019ed0e6-a903-7580-9527-8e46adeaccd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_LiabilityForUncertainTaxPositions_019ed0e6-a903-758f-9b93-d7b3535c3d94" xlink:href="ahfc-20260630.xsd#ahfc_LiabilityForUncertainTaxPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_ahfc_LiabilityForUncertainTaxPositions_019ed0e6-a903-758f-9b93-d7b3535c3d94" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019efdaa-4a8a-7453-bcaa-3bcb7d12225b" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DividendsPayableCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_DividendsPayableCurrentAndNoncurrent_019efdaa-4a8a-7453-bcaa-3bcb7d12225b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherSundryLiabilities_019ed0e6-a903-7ec8-bb25-c860d33b0be7" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherSundryLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_OtherSundryLiabilities_019ed0e6-a903-7ec8-bb25-c860d33b0be7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilities_019ed0e6-a903-7e3b-8b5f-965ace30e74b" 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_ahfc_OtherLiabilitiesLineItems_019ed0e6-a903-7dbd-b304-4e7dbecf9d49" xlink:to="loc_us-gaap_OtherLiabilities_019ed0e6-a903-7e3b-8b5f-965ace30e74b" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofFairValueHierarchyofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FairValueMeasurementsSummaryofFairValueHierarchyofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofFairValueHierarchyofAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ed0e6-a903-7f2c-ac8d-b52827c2ab92" 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_019ed0e6-a903-7e17-80c6-dfe3d878dd99" 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_019ed0e6-a903-7f2c-ac8d-b52827c2ab92" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ed0e6-a903-7e17-80c6-dfe3d878dd99" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-78a9-94c1-1815ead9b8bc" 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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ed0e6-a903-7e17-80c6-dfe3d878dd99" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019ed0e6-a903-78a9-94c1-1815ead9b8bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-78a9-94c1-1815ead9b8bc_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_019ed0e6-a903-78a9-94c1-1815ead9b8bc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-78a9-94c1-1815ead9b8bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-71f4-b1c6-3c670d9066b3" 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_019ed0e6-a903-78a9-94c1-1815ead9b8bc" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-71f4-b1c6-3c670d9066b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-7716-92f8-f59e8fb850b8" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-71f4-b1c6-3c670d9066b3" xlink:to="loc_us-gaap_InterestRateSwapMember_019ed0e6-a903-7716-92f8-f59e8fb850b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-7d23-84cf-6390a573c5cb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019ed0e6-a903-71f4-b1c6-3c670d9066b3" xlink:to="loc_us-gaap_CurrencySwapMember_019ed0e6-a903-7d23-84cf-6390a573c5cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-7274-bb0b-eb80a9cca758" 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_019ed0e6-a903-7e17-80c6-dfe3d878dd99" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-7274-bb0b-eb80a9cca758" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7274-bb0b-eb80a9cca758_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_019ed0e6-a903-7274-bb0b-eb80a9cca758" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7274-bb0b-eb80a9cca758_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7ecf-a3af-7a4ed804812f" 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_019ed0e6-a903-7274-bb0b-eb80a9cca758" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7ecf-a3af-7a4ed804812f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-74a5-8c6c-8f49843d764d" 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_019ed0e6-a903-7ecf-a3af-7a4ed804812f" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-74a5-8c6c-8f49843d764d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-74e4-9c3a-4345fdc27232" 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_019ed0e6-a903-7ecf-a3af-7a4ed804812f" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-74e4-9c3a-4345fdc27232" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7bbf-a343-4c3d8332968f" 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_019ed0e6-a903-7ecf-a3af-7a4ed804812f" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7bbf-a343-4c3d8332968f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_DerivativeInstrumentDetailAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ed0e6-a903-7f2c-ac8d-b52827c2ab92" xlink:to="loc_us-gaap_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019f9f4f-9c34-790b-98cf-1e88113de67a" 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_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019f9f4f-9c34-790b-98cf-1e88113de67a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019ed0e6-a903-7bfe-aab0-19f8074b4920" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019ed0e6-a903-7bfe-aab0-19f8074b4920" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019f9f50-5fbf-7967-9799-cbd26c5912a8" 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_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019f9f50-5fbf-7967-9799-cbd26c5912a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019ed0e6-a903-7e8b-a7db-5c06f56efa63" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentDetailAbstract_019ed0e6-a903-702e-97c7-f9a3c51383b5" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019ed0e6-a903-7e8b-a7db-5c06f56efa63" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofNonrecurringFairValueMeasurementsDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FairValueMeasurementsSummaryofNonrecurringFairValueMeasurementsDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofNonrecurringFairValueMeasurementsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ed0e6-a903-7919-b55b-8b1b60345a4e" 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_019ed0e6-a903-7e8b-90ac-88ad53bf1670" 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_019ed0e6-a903-7919-b55b-8b1b60345a4e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019ed0e6-a903-7e8b-90ac-88ad53bf1670" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-75df-b675-79cab9aef810" 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_019ed0e6-a903-7e8b-90ac-88ad53bf1670" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-75df-b675-79cab9aef810" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-75df-b675-79cab9aef810_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_019ed0e6-a903-75df-b675-79cab9aef810" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-75df-b675-79cab9aef810_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-78cf-916f-aac78c4c657d" 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_019ed0e6-a903-75df-b675-79cab9aef810" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-78cf-916f-aac78c4c657d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-790b-adf7-3b3d2c1afc4d" 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_019ed0e6-a903-78cf-916f-aac78c4c657d" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-790b-adf7-3b3d2c1afc4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-7354-964f-0f8d1a4da5a1" 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_019ed0e6-a903-78cf-916f-aac78c4c657d" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-7354-964f-0f8d1a4da5a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7126-92da-00ee4618ae19" 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_019ed0e6-a903-78cf-916f-aac78c4c657d" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7126-92da-00ee4618ae19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0" 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_019ed0e6-a903-7e8b-90ac-88ad53bf1670" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0_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_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ed0e6-a903-7449-9bb8-03250bc88ba9" 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_019ed0e6-a903-7e8e-a9b0-a106dd55b7e0" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ed0e6-a903-7449-9bb8-03250bc88ba9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7620-805f-f315ac99946f" 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_019ed0e6-a903-7449-9bb8-03250bc88ba9" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7620-805f-f315ac99946f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_019ed0e6-a903-79a8-851b-1e4dbcf8031d" 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_019ed0e6-a903-7620-805f-f315ac99946f" xlink:to="loc_us-gaap_ChangeDuringPeriodFairValueDisclosureMember_019ed0e6-a903-79a8-851b-1e4dbcf8031d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure_019ed0e6-a903-7563-9716-6ab36e2ef8e2" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019ed0e6-a903-7919-b55b-8b1b60345a4e" xlink:to="loc_us-gaap_AssetsHeldForSaleLongLivedFairValueDisclosure_019ed0e6-a903-7563-9716-6ab36e2ef8e2" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofCarryingValuesandFairValuesofFinancialInstrumentsExceptforthoseMeasuredatFairValueonaRecurringBasisDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#FairValueMeasurementsSummaryofCarryingValuesandFairValuesofFinancialInstrumentsExceptforthoseMeasuredatFairValueonaRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/FairValueMeasurementsSummaryofCarryingValuesandFairValuesofFinancialInstrumentsExceptforthoseMeasuredatFairValueonaRecurringBasisDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ed0e6-a903-755d-8616-39c4a63a90af" 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_019ed0e6-a903-7112-be74-ec87d44fdfb5" 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_019ed0e6-a903-755d-8616-39c4a63a90af" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTable_019ed0e6-a903-7112-be74-ec87d44fdfb5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-7e2b-b707-acd13d635ea9" 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_019ed0e6-a903-7112-be74-ec87d44fdfb5" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019ed0e6-a903-7e2b-b707-acd13d635ea9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7e2b-b707-acd13d635ea9_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_019ed0e6-a903-7e2b-b707-acd13d635ea9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-7e2b-b707-acd13d635ea9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-721a-b792-48a7df4746d1" 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_019ed0e6-a903-7e2b-b707-acd13d635ea9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019ed0e6-a903-721a-b792-48a7df4746d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-7cf1-9ade-73ada0f8d732" 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_019ed0e6-a903-721a-b792-48a7df4746d1" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019ed0e6-a903-7cf1-9ade-73ada0f8d732" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-794b-ad80-9ba473efbc9b" 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_019ed0e6-a903-721a-b792-48a7df4746d1" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019ed0e6-a903-794b-ad80-9ba473efbc9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7d99-abc9-9787d39c7faf" 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_019ed0e6-a903-721a-b792-48a7df4746d1" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019ed0e6-a903-7d99-abc9-9787d39c7faf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019ed0e6-a903-7aff-9357-f85c4c02bdc8" 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_019ed0e6-a903-7112-be74-ec87d44fdfb5" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019ed0e6-a903-7aff-9357-f85c4c02bdc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7aff-9357-f85c4c02bdc8_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_019ed0e6-a903-7aff-9357-f85c4c02bdc8" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7aff-9357-f85c4c02bdc8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ed0e6-a903-7cb7-a8e9-4dc68388e55d" 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_019ed0e6-a903-7aff-9357-f85c4c02bdc8" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019ed0e6-a903-7cb7-a8e9-4dc68388e55d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7280-b609-07e061c972da" 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_019ed0e6-a903-7cb7-a8e9-4dc68388e55d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019ed0e6-a903-7280-b609-07e061c972da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ed0e6-a903-7fd8-98d4-0123978d1af4" 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_019ed0e6-a903-7280-b609-07e061c972da" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019ed0e6-a903-7fd8-98d4-0123978d1af4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ed0e6-a903-755d-8616-39c4a63a90af" xlink:to="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoansNet_019ed0e6-a903-7b2c-89c3-55cb4e0bd872" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoansNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" xlink:to="loc_ahfc_DealerLoansNet_019ed0e6-a903-7b2c-89c3-55cb4e0bd872" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_DealerLoansNetFairValueDisclosure_019ed0e6-a903-7e14-8d0b-bb3039862375" xlink:href="ahfc-20260630.xsd#ahfc_DealerLoansNetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" xlink:to="loc_ahfc_DealerLoansNetFairValueDisclosure_019ed0e6-a903-7e14-8d0b-bb3039862375" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoansNet_019ed0e6-a903-7130-a041-e45f91b26ebf" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoansNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" xlink:to="loc_ahfc_RetailLoansNet_019ed0e6-a903-7130-a041-e45f91b26ebf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RetailLoansNetFairValueDisclosure_019ed0e6-a903-7f8b-8f90-282ecbd0eb84" xlink:href="ahfc-20260630.xsd#ahfc_RetailLoansNetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7409-8b0a-577263814dcd" xlink:to="loc_ahfc_RetailLoansNetFairValueDisclosure_019ed0e6-a903-7f8b-8f90-282ecbd0eb84" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" 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_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems_019ed0e6-a903-755d-8616-39c4a63a90af" xlink:to="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaper_019efdb2-23b5-7237-b003-3c7ad03e8adc" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_CommercialPaper"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_CommercialPaper_019efdb2-23b5-7237-b003-3c7ad03e8adc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CommercialPaperFairValueDisclosure_019ed0e6-a903-754e-8c79-c693bb1e493c" xlink:href="ahfc-20260630.xsd#ahfc_CommercialPaperFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_ahfc_CommercialPaperFairValueDisclosure_019ed0e6-a903-754e-8c79-c693bb1e493c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableToBank_019efdb3-d430-7b1c-89d0-4e03b10a3f9c" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansPayableToBank"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_LoansPayableToBank_019efdb3-d430-7b1c-89d0-4e03b10a3f9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansPayableFairValueDisclosure_019ed0e6-a903-7d8e-a193-3826b85bb889" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_LoansPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_LoansPayableFairValueDisclosure_019ed0e6-a903-7d8e-a193-3826b85bb889" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MediumTermNotes_019efdb4-5224-77aa-894d-942ddae428eb" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_MediumTermNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_MediumTermNotes_019efdb4-5224-77aa-894d-942ddae428eb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableFairValueDisclosure_019ed0e6-a903-7f96-bf1a-f911bbacb7f6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_NotesPayableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_NotesPayableFairValueDisclosure_019ed0e6-a903-7f96-bf1a-f911bbacb7f6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermDebt_019efdb5-be90-7ae5-8651-90e1b8e0646d" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_OtherLongTermDebt_019efdb5-be90-7ae5-8651-90e1b8e0646d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OtherLongTermDebtFairValueDisclosure_019ed0e6-a903-7b3a-9375-29911223eb21" xlink:href="ahfc-20260630.xsd#ahfc_OtherLongTermDebtFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_ahfc_OtherLongTermDebtFairValueDisclosure_019ed0e6-a903-7b3a-9375-29911223eb21" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebt_019efdb6-64d2-7690-b39d-b454d89fe0b6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_SecuredDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_us-gaap_SecuredDebt_019efdb6-64d2-7690-b39d-b454d89fe0b6" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_SecuredDebtFairValueDisclosure_019ed0e6-a903-7d77-8a48-24aa8404f9c6" xlink:href="ahfc-20260630.xsd#ahfc_SecuredDebtFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019ed0e6-a903-7040-b1d8-68ca0a128590" xlink:to="loc_ahfc_SecuredDebtFairValueDisclosure_019ed0e6-a903-7d77-8a48-24aa8404f9c6" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.hondafinancialservices.com/role/SegmentandGeographicInformationDetail" xlink:type="simple" xlink:href="ahfc-20260630.xsd#SegmentandGeographicInformationDetail"/>
  <link:definitionLink xlink:role="http://www.hondafinancialservices.com/role/SegmentandGeographicInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" 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_019ed0e6-a903-7c29-8cc7-b93cac7365d0" 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_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019ed0e6-a903-7c29-8cc7-b93cac7365d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019ed0e6-a903-7529-8b55-7e12d7bc9e15" 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_019ed0e6-a903-7c29-8cc7-b93cac7365d0" xlink:to="loc_srt_ConsolidationItemsAxis_019ed0e6-a903-7529-8b55-7e12d7bc9e15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019ed0e6-a903-7529-8b55-7e12d7bc9e15_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_019ed0e6-a903-7529-8b55-7e12d7bc9e15" xlink:to="loc_srt_ConsolidationItemsDomain_019ed0e6-a903-7529-8b55-7e12d7bc9e15_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019ed0e6-a903-7eb2-be88-75508e8a7c33" 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_019ed0e6-a903-7529-8b55-7e12d7bc9e15" xlink:to="loc_srt_ConsolidationItemsDomain_019ed0e6-a903-7eb2-be88-75508e8a7c33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_019ed0e6-a903-7b71-90dd-6248efe2ec27" 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_019ed0e6-a903-7eb2-be88-75508e8a7c33" xlink:to="loc_us-gaap_OperatingSegmentsMember_019ed0e6-a903-7b71-90dd-6248efe2ec27" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019ed0e6-a903-71e2-9b6b-eb067daafe59" 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_019ed0e6-a903-7c29-8cc7-b93cac7365d0" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019ed0e6-a903-71e2-9b6b-eb067daafe59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ed0e6-a903-71e2-9b6b-eb067daafe59_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_019ed0e6-a903-71e2-9b6b-eb067daafe59" xlink:to="loc_us-gaap_SegmentDomain_019ed0e6-a903-71e2-9b6b-eb067daafe59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019ed0e6-a903-7ebc-be6c-b25b79fcd705" 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_019ed0e6-a903-71e2-9b6b-eb067daafe59" xlink:to="loc_us-gaap_SegmentDomain_019ed0e6-a903-7ebc-be6c-b25b79fcd705" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_UnitedStatesSegmentMember_019ed0e6-a903-755e-9b26-c6a2275b51be" xlink:href="ahfc-20260630.xsd#ahfc_UnitedStatesSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019ed0e6-a903-7ebc-be6c-b25b79fcd705" xlink:to="loc_ahfc_UnitedStatesSegmentMember_019ed0e6-a903-755e-9b26-c6a2275b51be" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_CanadaSegmentMember_019ed0e6-a903-7c07-aa63-c3ab38dbe9e9" xlink:href="ahfc-20260630.xsd#ahfc_CanadaSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019ed0e6-a903-7ebc-be6c-b25b79fcd705" xlink:to="loc_ahfc_CanadaSegmentMember_019ed0e6-a903-7c07-aa63-c3ab38dbe9e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_019ed0e6-a903-7d76-ae20-a384bb2f8ae1" 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_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_NumberOfReportableSegments_019ed0e6-a903-7d76-ae20-a384bb2f8ae1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles_019ed0e6-a903-7350-84fd-fb558f45d051" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansConsumerInstallmentAutomobilesMarineAndOtherVehicles_019ed0e6-a903-7350-84fd-fb558f45d051" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansCommercial_019ed0e6-a903-7c1a-a209-1fc842f9ef4f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansCommercial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansCommercial_019ed0e6-a903-7c1a-a209-1fc842f9ef4f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLeaseIncome_019ed0e6-a903-75af-bd44-67430422b6ea" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingLeaseLeaseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_OperatingLeaseLeaseIncome_019ed0e6-a903-75af-bd44-67430422b6ea" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_019ed0e6-a903-7755-932e-9f48007ed0aa" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeasesHeldInPortfolio_019ed0e6-a903-7755-932e-9f48007ed0aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_OperatingLeaseCostLeasedVehicleExpense_019ed0e6-a903-71bc-a720-7a4e1487755f" xlink:href="ahfc-20260630.xsd#ahfc_OperatingLeaseCostLeasedVehicleExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_ahfc_OperatingLeaseCostLeasedVehicleExpense_019ed0e6-a903-71bc-a720-7a4e1487755f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019ed0e6-a903-7916-8af0-ca991e2d898d" 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_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_InterestExpenseOperating_019ed0e6-a903-7916-8af0-ca991e2d898d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_RealizedGainLossOnDerivativesAndForeignCurrencyDenominatedDebt_019ed0e6-a903-7ad0-8248-c324621bf119" xlink:href="ahfc-20260630.xsd#ahfc_RealizedGainLossOnDerivativesAndForeignCurrencyDenominatedDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_ahfc_RealizedGainLossOnDerivativesAndForeignCurrencyDenominatedDebt_019ed0e6-a903-7ad0-8248-c324621bf119" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_NetFinancingRevenuesExcludingOtherRevenuesAdjusted_019ed0e6-a903-7bfc-ba88-1f3c91602fa3" xlink:href="ahfc-20260630.xsd#ahfc_NetFinancingRevenuesExcludingOtherRevenuesAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_ahfc_NetFinancingRevenuesExcludingOtherRevenuesAdjusted_019ed0e6-a903-7bfc-ba88-1f3c91602fa3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncome_019ed0e6-a903-727f-84a8-a4eb43555dde" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_us-gaap_OtherIncome_019ed0e6-a903-727f-84a8-a4eb43555dde" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_NetFinancingAndOtherRevenuesAdjusted_019ed0e6-a903-7477-a1b2-e180ee722758" xlink:href="ahfc-20260630.xsd#ahfc_NetFinancingAndOtherRevenuesAdjusted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019ed0e6-a903-7775-ab09-d21929fe9e10" xlink:to="loc_ahfc_NetFinancingAndOtherRevenuesAdjusted_019ed0e6-a903-7477-a1b2-e180ee722758" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_OperatingExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_019ed0e6-a903-787a-b0c4-5f613db6b670" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_019ed0e6-a903-787a-b0c4-5f613db6b670" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019ed0e6-a903-70d1-821b-3c6db5a960a9" 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_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019ed0e6-a903-70d1-821b-3c6db5a960a9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnContractTermination_019ed0e6-a903-731c-a5cc-40faafa1bcac" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnContractTermination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:to="loc_us-gaap_GainLossOnContractTermination_019ed0e6-a903-731c-a5cc-40faafa1bcac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ahfc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndValuationAdjustmentNoncontrollingInterest_019ed0e6-a903-763c-abfa-12733001ef65" xlink:href="ahfc-20260630.xsd#ahfc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndValuationAdjustmentNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingExpensesAbstract_019ed0e6-a903-7acd-9939-4b1640e00bf6" xlink:to="loc_ahfc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndValuationAdjustmentNoncontrollingInterest_019ed0e6-a903-763c-abfa-12733001ef65" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ed0e6-a903-75e2-98b5-b466eff5c016" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_GainLossOnDerivativeInstrumentsNetPretax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_GainLossOnDerivativeInstrumentsNetPretax_019ed0e6-a903-75e2-98b5-b466eff5c016" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019ed0e6-a903-7eff-8bb6-b6773b7fef9a" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_019ed0e6-a903-7eff-8bb6-b6773b7fef9a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019ed0e6-a903-7f01-a869-684f52f486d6" 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_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_019ed0e6-a903-7f01-a869-684f52f486d6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019ed0e6-a903-7743-8a04-ffbc99e47e08" 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_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019ed0e6-a903-7743-8a04-ffbc99e47e08" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7e59-8ae2-76d26ddb6ae8" 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_SegmentReportingInformationLineItems_019ed0e6-a903-709a-9818-eef870ead6e3" xlink:to="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7e59-8ae2-76d26ddb6ae8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a903-7038-b6ee-b6650b65f804" 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_019ed0e6-a903-7e59-8ae2-76d26ddb6ae8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019ed0e6-a903-7038-b6ee-b6650b65f804" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_019ed0e6-a903-764a-bb27-e2ce93445b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2026/elts/us-gaap-2026.xsd#us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019ed0e6-a903-7e59-8ae2-76d26ddb6ae8" xlink:to="loc_us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet_019ed0e6-a903-764a-bb27-e2ce93445b1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019ed0e6-a903-7aba-b6c7-272c5014618c" 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_019ed0e6-a903-7e59-8ae2-76d26ddb6ae8" xlink:to="loc_us-gaap_Assets_019ed0e6-a903-7aba-b6c7-272c5014618c" xlink:type="arc" order="3"/>
  </link:definitionLink>
</link:linkbase>
