content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001199930</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
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      <issuerInfo>
        <issuerCik>0000798354</issuerCik>
        <issuerName>FISERV, INC.</issuerName>
        <secFileNumber>001-38962</secFileNumber>
        <issuerAddress>
          <com:street1>600 N. Vel R. Phillips Avenue</com:street1>
          <com:city>Milwaukee</com:city>
          <com:stateOrCountry>WI</com:stateOrCountry>
          <com:zipCode>53203</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>2628795000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Heidi Miller</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>J.P. Morgan Securities LLC</name>
          <address>
            <com:street1>390 Madison Avenue - 6th Floor</com:street1>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10017</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>30000</noOfUnitsSold>
        <aggregateMarketValue>6027300</aggregateMarketValue>
        <noOfUnitsOutstanding>568918735</noOfUnitsOutstanding>
        <approxSaleDate>10/30/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/07/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Stock Option Exercises</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>30000</amountOfSecuritiesAcquired>
        <paymentDate>02/07/2024</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>10/30/2024</noticeDate>
        <signature>/s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Heidi Miller</signature>
      </noticeSignature>
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text: 144
  0001199930
  XXXXXXXX
  LIVE
  0000798354
  FISERV, INC.
  001-38962
  600 N. Vel R. Phillips Avenue
  Milwaukee
  WI
  53203
  2628795000
  Heidi Miller
  Director
  Common Stock
  J.P. Morgan Securities LLC
  390 Madison Avenue - 6th Floor
  New York
  NY
  10017
  30000
  6027300
  568918735
  10/30/2024
  NYSE
  Common Stock
  02/07/2024
  Stock Option Exercises
  Issuer
  N
  30000
  02/07/2024
  N/A
  Y
  10/30/2024
  /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for Heidi Miller