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>0001237466</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001169561</issuerCik>
        <issuerName>COMMVAULT SYSTEMS INC</issuerName>
        <secFileNumber>001-33026</secFileNumber>
        <issuerAddress>
          <com:street1>1 COMMVAULT WAY</com:street1>
          <com:city>TINTON FALLS</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07724</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>732-870-4000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>WALKER DAVID F</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>245 Summer Street</com:street1>
            <com:city>Boston</com:city>
            <com:stateOrCountry>MA</com:stateOrCountry>
            <com:zipCode>02110</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>54766</noOfUnitsSold>
        <aggregateMarketValue>3737231.00</aggregateMarketValue>
        <noOfUnitsOutstanding>43874713</noOfUnitsOutstanding>
        <approxSaleDate>09/08/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/24/2022</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>6000</amountOfSecuritiesAcquired>
        <paymentDate>10/24/2022</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/19/2022</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2640</amountOfSecuritiesAcquired>
        <paymentDate>08/19/2022</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/27/2020</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4803</amountOfSecuritiesAcquired>
        <paymentDate>08/27/2020</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/27/2020</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>7500</amountOfSecuritiesAcquired>
        <paymentDate>01/27/2020</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/22/2019</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3074</amountOfSecuritiesAcquired>
        <paymentDate>08/22/2019</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/29/2018</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2000</amountOfSecuritiesAcquired>
        <paymentDate>01/29/2018</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/24/2016</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>4750</amountOfSecuritiesAcquired>
        <paymentDate>08/24/2016</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>02/11/2016</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2500</amountOfSecuritiesAcquired>
        <paymentDate>02/11/2016</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/22/2016</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>14500</amountOfSecuritiesAcquired>
        <paymentDate>01/22/2016</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>10/14/2014</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3200</amountOfSecuritiesAcquired>
        <paymentDate>10/14/2014</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/14/2012</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>52</amountOfSecuritiesAcquired>
        <paymentDate>03/14/2012</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>12/14/2011</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>52</amountOfSecuritiesAcquired>
        <paymentDate>12/14/2011</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>08/24/2023</acquiredDate>
        <natureOfAcquisitionTransaction>stock grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3695</amountOfSecuritiesAcquired>
        <paymentDate>08/24/2023</paymentDate>
        <natureOfPayment>compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>09/08/2023</noticeDate>
        <signature>/s/ Christian Nasser as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David Walker</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 9116}]
text: 144
  0001237466
  XXXXXXXX
  LIVE
  0001169561
  COMMVAULT SYSTEMS INC
  001-33026
  1 COMMVAULT WAY
  TINTON FALLS
  NJ
  07724
  732-870-4000
  WALKER DAVID F
  Director
  Common
  Fidelity Brokerage Services LLC
  245 Summer Street
  Boston
  MA
  02110
  54766
  3737231.00
  43874713
  09/08/2023
  NASDAQ
  Common
  10/24/2022
  stock grant
  issuer
  N
  6000
  10/24/2022
  compensation
  Common
  08/19/2022
  stock grant
  issuer
  N
  2640
  08/19/2022
  compensation
  Common
  08/27/2020
  stock grant
  issuer
  N
  4803
  08/27/2020
  compensation
  Common
  01/27/2020
  stock grant
  issuer
  N
  7500
  01/27/2020
  compensation
  Common
  08/22/2019
  stock grant
  issuer
  N
  3074
  08/22/2019
  compensation
  Common
  01/29/2018
  stock grant
  issuer
  N
  2000
  01/29/2018
  compensation
  Common
  08/24/2016
  stock grant
  issuer
  N
  4750
  08/24/2016
  compensation
  Common
  02/11/2016
  stock grant
  issuer
  N
  2500
  02/11/2016
  compensation
  Common
  01/22/2016
  stock grant
  issuer
  N
  14500
  01/22/2016
  compensation
  Common
  10/14/2014
  stock grant
  issuer
  N
  3200
  10/14/2014
  compensation
  Common
  03/14/2012
  stock grant
  issuer
  N
  52
  03/14/2012
  compensation
  Common
  12/14/2011
  stock grant
  issuer
  N
  52
  12/14/2011
  compensation
  Common
  08/24/2023
  stock grant
  issuer
  N
  3695
  08/24/2023
  compensation
  Y
  09/08/2023
  /s/ Christian Nasser as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for David Walker