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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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001222574</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001013857</issuerCik>
        <issuerName>PEGASYSTEMS INC</issuerName>
        <secFileNumber>001-11859</secFileNumber>
        <issuerAddress>
          <com:street1>ONE MAIN STREET</com:street1>
          <com:city>CAMBRIDGE</com:city>
          <com:stateOrCountry>MA</com:stateOrCountry>
          <com:zipCode>02142-1531</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>6173749600</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>JONES RICHARD H</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>common stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>COWEN &amp; COMPANY LLC</name>
          <address>
            <com:street1>599 LEXINGTON AVE</com:street1>
            <com:city>NEW YORK</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10022</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>10000</noOfUnitsSold>
        <aggregateMarketValue>618000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>85030000</noOfUnitsOutstanding>
        <approxSaleDate>04/29/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>COMMON STOCK</securitiesClassTitle>
        <acquiredDate>07/12/2007</acquiredDate>
        <natureOfAcquisitionTransaction>DRIRECTLY FROM COMPANY</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>PEGASYSTEMS, INC</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>256986</amountOfSecuritiesAcquired>
        <paymentDate>07/12/2007</paymentDate>
        <natureOfPayment>CONTRIBUTION</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>RICHARD H. JONES</name>
          <address>
            <com:street1>12916 BAY PLANTATION DRIVE</com:street1>
            <com:city>JACKSONVILLE</com:city>
            <com:stateOrCountry>FL</com:stateOrCountry>
            <com:zipCode>32223-0784</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>COMMON STOCK</securitiesClassTitle>
        <saleDate>02/23/2024</saleDate>
        <amountOfSecuritiesSold>10000</amountOfSecuritiesSold>
        <grossProceeds>633941.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>04/29/2024</noticeDate>
        <signature>/S/ RICHARD H. JONES</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001222574
  XXXXXXXX
  LIVE
  0001013857
  PEGASYSTEMS INC
  001-11859
  ONE MAIN STREET
  CAMBRIDGE
  MA
  02142-1531
  6173749600
  JONES RICHARD H
  Director
  common stock
  COWEN & COMPANY LLC
  599 LEXINGTON AVE
  NEW YORK
  NY
  10022
  10000
  618000.00
  85030000
  04/29/2024
  NASDAQ
  COMMON STOCK
  07/12/2007
  DRIRECTLY FROM COMPANY
  PEGASYSTEMS, INC
  N
  256986
  07/12/2007
  CONTRIBUTION
  N
  RICHARD H. JONES
  12916 BAY PLANTATION DRIVE
  JACKSONVILLE
  FL
  32223-0784
  COMMON STOCK
  02/23/2024
  10000
  633941.00
  04/29/2024
  /S/ RICHARD H. JONES