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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019fd266-cbc9-7cdd-97d3-0c85f5f31a9d,g:8feb2ecb-dc04-4604-bded-aca762d0b836-->
<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.parknationalbank.com/role/DEIDocument" xlink:type="simple" xlink:href="prk-20260807.xsd#DEIDocument"/>
  <link:definitionLink xlink:role="http://www.parknationalbank.com/role/DEIDocument" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationTable_019fd266-cbc9-7486-8b40-c3c0474034f2" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_DocumentInformationTable_019fd266-cbc9-7486-8b40-c3c0474034f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentInformationDocumentAxis_019fd266-cbc9-77d5-89c9-a6a9363669f5" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentInformationDocumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_DocumentInformationTable_019fd266-cbc9-7486-8b40-c3c0474034f2" xlink:to="loc_dei_DocumentInformationDocumentAxis_019fd266-cbc9-77d5-89c9-a6a9363669f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_019fd266-cbc9-77d5-89c9-a6a9363669f5_default" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_DocumentInformationDocumentAxis_019fd266-cbc9-77d5-89c9-a6a9363669f5" xlink:to="loc_dei_DocumentDomain_019fd266-cbc9-77d5-89c9-a6a9363669f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentDomain_019fd266-cbc9-7b8d-9467-7f0b57a50813" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_DocumentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_DocumentInformationDocumentAxis_019fd266-cbc9-77d5-89c9-a6a9363669f5" xlink:to="loc_dei_DocumentDomain_019fd266-cbc9-7b8d-9467-7f0b57a50813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019fd266-cbc9-7bf8-921b-b55aff715ffa" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_CityAreaCode_019fd266-cbc9-7bf8-921b-b55aff715ffa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019fd266-cbc9-7a00-a4a1-39d217edcb4c" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityRegistrantName_019fd266-cbc9-7a00-a4a1-39d217edcb4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019fd266-cbc9-73ed-8a20-b1843c8c0df5" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityAddressAddressLine1_019fd266-cbc9-73ed-8a20-b1843c8c0df5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019fd266-cbc9-7591-b7aa-092a2d84a577" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityAddressAddressLine2_019fd266-cbc9-7591-b7aa-092a2d84a577" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019fd266-cbc9-730b-99df-fcb5d3aa4087" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityAddressCityOrTown_019fd266-cbc9-730b-99df-fcb5d3aa4087" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019fd266-cbc9-78a9-bb07-a3499ea21c11" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityAddressStateOrProvince_019fd266-cbc9-78a9-bb07-a3499ea21c11" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019fd266-cbc9-719e-bc66-1a820a32c022" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityAddressPostalZipCode_019fd266-cbc9-719e-bc66-1a820a32c022" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019fd266-cbc9-7090-9377-f10c4131bf1b" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019fd266-cbc9-7090-9377-f10c4131bf1b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019fd266-cbc9-7e5e-a409-6a57f11d8a43" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_DocumentPeriodEndDate_019fd266-cbc9-7e5e-a409-6a57f11d8a43" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019fd266-cbc9-7895-b197-d2960d001739" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_DocumentType_019fd266-cbc9-7895-b197-d2960d001739" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_019fd266-cbc9-7220-9947-ed7661a8584b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_WrittenCommunications_019fd266-cbc9-7220-9947-ed7661a8584b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_019fd266-cbc9-7f0a-aa48-ac207651911b" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_SolicitingMaterial_019fd266-cbc9-7f0a-aa48-ac207651911b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_019fd266-cbc9-7bb5-8a72-94f2735d1fb4" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_PreCommencementTenderOffer_019fd266-cbc9-7bb5-8a72-94f2735d1fb4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_019fd266-cbc9-79b0-b7ac-408f44887202" xlink:href="https://xbrl.sec.gov/dei/2026/dei-2026.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_019fd266-cbc9-79b0-b7ac-408f44887202" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019fd266-cbc9-7335-8369-59a5652bfbae" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_Security12bTitle_019fd266-cbc9-7335-8369-59a5652bfbae" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019fd266-cbc9-701c-9f53-c121f5de975d" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_TradingSymbol_019fd266-cbc9-701c-9f53-c121f5de975d" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019fd266-cbc9-7755-b300-fdd6f567076c" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityEmergingGrowthCompany_019fd266-cbc9-7755-b300-fdd6f567076c" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019fd266-cbc9-7935-9b8b-4745d8bdd8a3" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_AmendmentFlag_019fd266-cbc9-7935-9b8b-4745d8bdd8a3" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019fd266-cbc9-70b6-b67b-89abc77de956" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_DocumentFiscalYearFocus_019fd266-cbc9-70b6-b67b-89abc77de956" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019fd266-cbc9-7d0c-a08d-5f0b949ec34e" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019fd266-cbc9-7d0c-a08d-5f0b949ec34e" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019fd266-cbc9-72b1-a1b0-2c52d2f12fb0" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityCentralIndexKey_019fd266-cbc9-72b1-a1b0-2c52d2f12fb0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019fd266-cbc9-788d-af38-66faabb5031a" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_SecurityExchangeName_019fd266-cbc9-788d-af38-66faabb5031a" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019fd266-cbc9-7197-9090-6197251b56f4" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityFileNumber_019fd266-cbc9-7197-9090-6197251b56f4" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019fd266-cbc9-70fc-b53b-7b25fce3d7e7" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_EntityTaxIdentificationNumber_019fd266-cbc9-70fc-b53b-7b25fce3d7e7" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019fd266-cbc9-7d65-a513-5581f0cdd60f" 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_DocumentInformationLineItems_019fd266-cbc9-79b7-acc8-29cdd2c982f6" xlink:to="loc_dei_LocalPhoneNumber_019fd266-cbc9-7d65-a513-5581f0cdd60f" xlink:type="arc" order="24"/>
  </link:definitionLink>
</link:linkbase>
