content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001872194</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000008670</issuerCik>
        <issuerName>AUTOMATIC DATA PROCESSING INC</issuerName>
        <secFileNumber>001-05397</secFileNumber>
        <issuerAddress>
          <com:street1>ONE ADP BOULVARD</com:street1>
          <com:city>ROSELAND</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07068</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>9739745000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kwon David</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>1946</noOfUnitsSold>
        <aggregateMarketValue>571793.18</aggregateMarketValue>
        <noOfUnitsOutstanding>407456901</noOfUnitsOutstanding>
        <approxSaleDate>01/02/2025</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/01/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1077</amountOfSecuritiesAcquired>
        <paymentDate>09/01/2020</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/02/2025</acquiredDate>
        <natureOfAcquisitionTransaction>Options Granted - 09/01/2020</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>869</amountOfSecuritiesAcquired>
        <paymentDate>01/02/2025</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>01/02/2025</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/04/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Jackson Harris, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  David Kwon</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001872194
  XXXXXXXX
  LIVE
  0000008670
  AUTOMATIC DATA PROCESSING INC
  001-05397
  ONE ADP BOULVARD
  ROSELAND
  NJ
  07068
  9739745000
  Kwon David
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  1946
  571793.18
  407456901
  01/02/2025
  NASDAQ
  Common
  09/01/2020
  Restricted Stock Vesting
  Issuer
  N
  1077
  09/01/2020
  Compensation
  Common
  01/02/2025
  Options Granted - 09/01/2020
  Issuer
  N
  869
  01/02/2025
  Cash
  Y
  01/02/2025
  09/04/2024
  /s/ Jackson Harris, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for  David Kwon