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            <ccc>XXXXXXXX</ccc>
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        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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        <issuerCik>0001020569</issuerCik>
        <issuerName>IRON MOUNTAIN INC</issuerName>
        <secFileNumber>001-13045</secFileNumber>
        <issuerAddress>
          <com:street1>85 NEW HAMPSHIRE AVENUE, SUITE 150</com:street1>
          <com:street2>PEASE INTERNATIONAL TRADEPORT</com:street2>
          <com:city>PORTSMOUTH</com:city>
          <com:stateOrCountry>NH</com:stateOrCountry>
          <com:zipCode>03801</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>617-535-4781</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Meaney William L</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
          <relationshipToIssuer>Director</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>137032</noOfUnitsSold>
        <aggregateMarketValue>10784418.40</aggregateMarketValue>
        <noOfUnitsOutstanding>292275668</noOfUnitsOutstanding>
        <approxSaleDate>03/05/2024</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
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        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>21054</amountOfSecuritiesAcquired>
        <paymentDate>03/01/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>03/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
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        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>115978</amountOfSecuritiesAcquired>
        <paymentDate>03/01/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>12/12/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>693251.86</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
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        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>12/13/2023</saleDate>
        <amountOfSecuritiesSold>10507</amountOfSecuritiesSold>
        <grossProceeds>700291.55</grossProceeds>
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      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>01/09/2024</saleDate>
        <amountOfSecuritiesSold>15875</amountOfSecuritiesSold>
        <grossProceeds>1071086.25</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
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        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>01/10/2024</saleDate>
        <amountOfSecuritiesSold>15875</amountOfSecuritiesSold>
        <grossProceeds>1066641.25</grossProceeds>
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      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
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        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>02/05/2024</saleDate>
        <amountOfSecuritiesSold>15875</amountOfSecuritiesSold>
        <grossProceeds>1083310.00</grossProceeds>
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      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
            <com:street2>Suite 150</com:street2>
            <com:city>Portsmouth</com:city>
            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>02/06/2024</saleDate>
        <amountOfSecuritiesSold>15875</amountOfSecuritiesSold>
        <grossProceeds>1086167.50</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>William Meaney</name>
          <address>
            <com:street1>85 New Hampshire Avenue</com:street1>
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            <com:stateOrCountry>NH</com:stateOrCountry>
            <com:zipCode>03801</com:zipCode>
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        <securitiesClassTitle>Common</securitiesClassTitle>
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        <amountOfSecuritiesSold>115979</amountOfSecuritiesSold>
        <grossProceeds>9151152.44</grossProceeds>
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      <noticeSignature>
        <noticeDate>03/05/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>05/13/2022</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ Bradley Camilo, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William Meaney</signature>
      </noticeSignature>
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text: 144
  0001566391
  XXXXXXXX
  LIVE
  0001020569
  IRON MOUNTAIN INC
  001-13045
  85 NEW HAMPSHIRE AVENUE, SUITE 150
  PEASE INTERNATIONAL TRADEPORT
  PORTSMOUTH
  NH
  03801
  617-535-4781
  Meaney William L
  Officer
  Director
  Common
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  137032
  10784418.40
  292275668
  03/05/2024
  NYSE
  Common
  03/01/2024
  Restricted Stock Vesting
  Issuer
  N
  21054
  03/01/2024
  Compensation
  Common
  03/01/2024
  Performance Shares
  Issuer
  N
  115978
  03/01/2024
  Compensation
  N
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  12/12/2023
  10507
  693251.86
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  12/13/2023
  10507
  700291.55
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  01/09/2024
  15875
  1071086.25
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  01/10/2024
  15875
  1066641.25
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  02/05/2024
  15875
  1083310.00
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  02/06/2024
  15875
  1086167.50
  William Meaney
  85 New Hampshire Avenue
  Suite 150
  Portsmouth
  NH
  03801
  Common
  03/04/2024
  115979
  9151152.44
  03/05/2024
  05/13/2022
  /s/ Bradley Camilo, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for William Meaney