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>0001805266</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>DeSilva Joseph</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>4216</noOfUnitsSold>
        <aggregateMarketValue>1163616.00</aggregateMarketValue>
        <noOfUnitsOutstanding>407795203</noOfUnitsOutstanding>
        <approxSaleDate>09/04/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>09/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4216</amountOfSecuritiesAcquired>
        <paymentDate>09/01/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Joseph W. Desilva</name>
          <address>
            <com:street1>One ADP Boulevard</com:street1>
            <com:city>Roseland</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07068</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>06/13/2024</saleDate>
        <amountOfSecuritiesSold>376</amountOfSecuritiesSold>
        <grossProceeds>91845.52</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Joseph W. Desilva</name>
          <address>
            <com:street1>One ADP Boulevard</com:street1>
            <com:city>Roseland</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07068</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>09/03/2024</saleDate>
        <amountOfSecuritiesSold>1905</amountOfSecuritiesSold>
        <grossProceeds>522693.90</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>09/04/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>09/08/2023</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Joseph W. Desilva</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001805266
  XXXXXXXX
  LIVE
  0000008670
  AUTOMATIC DATA PROCESSING INC
  001-05397
  ONE ADP BOULVARD
  ROSELAND
  NJ
  07068
  9739745000
  DeSilva Joseph
  Officer
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  4216
  1163616.00
  407795203
  09/04/2024
  NASDAQ
  Common
  09/01/2024
  Restricted Stock Vesting
  Issuer
  N
  4216
  09/01/2024
  Compensation
  N
  Joseph W. Desilva
  One ADP Boulevard
  Roseland
  NJ
  07068
  Common
  06/13/2024
  376
  91845.52
  Joseph W. Desilva
  One ADP Boulevard
  Roseland
  NJ
  07068
  Common
  09/03/2024
  1905
  522693.90
  09/04/2024
  09/08/2023
  /s/ Eric Janiak, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Joseph W. Desilva