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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:5faef877-8a75-4e29-893b-633bedf74cc7,g:093f54cf-fed3-4871-b8ad-48d993e4bb4b-->
<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.pnc.com/role/CoverPage" xlink:type="simple" xlink:href="pnc-20210416.xsd#CoverPage"/>
  <link:definitionLink xlink:role="http://www.pnc.com/role/CoverPage" xlink:type="extended" id="iba75103603424a95a06677e5bbe21e21_CoverPage">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_612f4d3c-bc4c-4c94-82c5-0c569ac19fc0" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_Security12bTitle_612f4d3c-bc4c-4c94-82c5-0c569ac19fc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_WrittenCommunications_8ebcc349-782b-4f0e-80c6-6a7b5f88c98f" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_WrittenCommunications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_WrittenCommunications_8ebcc349-782b-4f0e-80c6-6a7b5f88c98f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_4190652c-be0a-4ed5-a018-3643276a9f2d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityIncorporationStateCountryCode_4190652c-be0a-4ed5-a018-3643276a9f2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_b827df0a-7230-4b96-af74-bf0931e2a093" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_DocumentType_b827df0a-7230-4b96-af74-bf0931e2a093" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_ce7dcce9-de5b-4965-b54f-b1fb66fbe46c" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityCentralIndexKey_ce7dcce9-de5b-4965-b54f-b1fb66fbe46c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_df5c34d0-4d6a-4652-8eed-1ea81b9b5640" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_AmendmentFlag_df5c34d0-4d6a-4652-8eed-1ea81b9b5640" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_d15f9e98-8105-4574-8a1e-c6503164a943" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_DocumentPeriodEndDate_d15f9e98-8105-4574-8a1e-c6503164a943" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_a5453188-fccf-4ffa-a402-1df2d5d93436" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityRegistrantName_a5453188-fccf-4ffa-a402-1df2d5d93436" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_e4871f80-2301-4257-9139-8e1ee04c27ef" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityFileNumber_e4871f80-2301-4257-9139-8e1ee04c27ef" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_c64f8c2a-e0d1-4d96-8e13-f95f6993df8e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityTaxIdentificationNumber_c64f8c2a-e0d1-4d96-8e13-f95f6993df8e" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_502a70fe-6132-43cb-81b8-10b0a19272dc" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityAddressAddressLine1_502a70fe-6132-43cb-81b8-10b0a19272dc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_676a340a-9078-4043-92fa-468e104cabb2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityAddressCityOrTown_676a340a-9078-4043-92fa-468e104cabb2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_85c16b5a-eaec-4860-8851-3c98aed11926" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityAddressStateOrProvince_85c16b5a-eaec-4860-8851-3c98aed11926" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_de6c587d-b4d1-42e6-8a27-500d7174a456" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityAddressPostalZipCode_de6c587d-b4d1-42e6-8a27-500d7174a456" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_b28ded91-2070-4753-9fb7-a584b2f2511c" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_CityAreaCode_b28ded91-2070-4753-9fb7-a584b2f2511c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_5e91f574-0bee-4992-8853-ad48a91f1d24" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_LocalPhoneNumber_5e91f574-0bee-4992-8853-ad48a91f1d24" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SolicitingMaterial_2a92030a-1e26-45b2-8a0f-2cda4d359fee" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SolicitingMaterial"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_SolicitingMaterial_2a92030a-1e26-45b2-8a0f-2cda4d359fee" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementTenderOffer_be26297c-a52f-4d41-b290-9e08050f0f5e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_PreCommencementTenderOffer_be26297c-a52f-4d41-b290-9e08050f0f5e" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_PreCommencementIssuerTenderOffer_912c0c40-2b9d-405c-86ed-3810da94b7d0" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_PreCommencementIssuerTenderOffer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_PreCommencementIssuerTenderOffer_912c0c40-2b9d-405c-86ed-3810da94b7d0" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_441fd5c5-bd53-4c30-a62f-cf8795f099fb" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntityEmergingGrowthCompany_441fd5c5-bd53-4c30-a62f-cf8795f099fb" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_e835ca76-8113-4b42-bc03-2d7dcfffd976" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_TradingSymbol_e835ca76-8113-4b42-bc03-2d7dcfffd976" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_5f763ae8-2815-49a8-8b01-958545d5096e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_SecurityExchangeName_5f763ae8-2815-49a8-8b01-958545d5096e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_2e1c5aba-d89a-4108-94cc-e192db31ebe6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_0767839b-5129-42aa-b107-9a4a4ed2d9d1" xlink:to="loc_dei_EntitiesTable_2e1c5aba-d89a-4108-94cc-e192db31ebe6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityListingsExchangeAxis_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityListingsExchangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_2e1c5aba-d89a-4108-94cc-e192db31ebe6" xlink:to="loc_dei_EntityListingsExchangeAxis_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830_default" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_EntityListingsExchangeAxis_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830" xlink:to="loc_dei_ExchangeDomain_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_ExchangeDomain_3b1a1f5d-72d3-43a3-aaa7-e96e00203de0" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_ExchangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_EntityListingsExchangeAxis_6a4cd17c-d7f0-41e9-9c7a-7092e4d33830" xlink:to="loc_dei_ExchangeDomain_3b1a1f5d-72d3-43a3-aaa7-e96e00203de0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_exch_XNYS_780af097-7c45-4219-9f23-9186c888fbdd" xlink:href="https://xbrl.sec.gov/exch/2020/exch-2020-01-31.xsd#exch_XNYS"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_ExchangeDomain_3b1a1f5d-72d3-43a3-aaa7-e96e00203de0" xlink:to="loc_exch_XNYS_780af097-7c45-4219-9f23-9186c888fbdd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_2e1c5aba-d89a-4108-94cc-e192db31ebe6" xlink:to="loc_us-gaap_StatementClassOfStockAxis_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3_default" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3" xlink:to="loc_us-gaap_ClassOfStockDomain_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a4d9ae4a-21f4-4c71-b1f9-e81b02d398cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_227ecde1-dfa2-442b-a4f3-b1c989d8f5c3" xlink:to="loc_us-gaap_ClassOfStockDomain_a4d9ae4a-21f4-4c71-b1f9-e81b02d398cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_a1bf882f-93fb-49ec-9a3b-f679d63915e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a4d9ae4a-21f4-4c71-b1f9-e81b02d398cf" xlink:to="loc_us-gaap_CommonStockMember_a1bf882f-93fb-49ec-9a3b-f679d63915e5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_pnc_SeriesPPreferredStockMember_788fb939-92a2-43f1-999c-56d29686c160" xlink:href="pnc-20210416.xsd#pnc_SeriesPPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_a4d9ae4a-21f4-4c71-b1f9-e81b02d398cf" xlink:to="loc_pnc_SeriesPPreferredStockMember_788fb939-92a2-43f1-999c-56d29686c160" xlink:type="arc" order="1"/>
  </link:definitionLink>
</link:linkbase>
