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>0001286007</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0000947484</issuerCik>
        <issuerName>Arch Capital Group</issuerName>
        <secFileNumber>001-16209</secFileNumber>
        <issuerAddress>
          <com:street1>warterloo house ground floor</com:street1>
          <com:street2>100 pitts bay road</com:street2>
          <com:city>pembroke</com:city>
          <com:stateOrCountry>D0</com:stateOrCountry>
          <com:zipCode>hm08</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>4412789250</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>marc grandisson</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>UBS Financial Services Inc</name>
          <address>
            <com:street1>1000 Harbor Blvd</com:street1>
            <com:street2>3rd Floor</com:street2>
            <com:city>Weehawken</com:city>
            <com:stateOrCountry>NJ</com:stateOrCountry>
            <com:zipCode>07086</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>200000</noOfUnitsSold>
        <aggregateMarketValue>15220000</aggregateMarketValue>
        <noOfUnitsOutstanding>372422622</noOfUnitsOutstanding>
        <approxSaleDate>05/19/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>commone</securitiesClassTitle>
        <acquiredDate>05/06/2022</acquiredDate>
        <natureOfAcquisitionTransaction>sar exercise</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>arch capital group</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>54275</amountOfSecuritiesAcquired>
        <paymentDate>05/06/2022</paymentDate>
        <natureOfPayment>cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>common</securitiesClassTitle>
        <acquiredDate>03/10/2022</acquiredDate>
        <natureOfAcquisitionTransaction>compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>arch capital group</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>62728</amountOfSecuritiesAcquired>
        <paymentDate>03/10/2022</paymentDate>
        <natureOfPayment>cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>common</securitiesClassTitle>
        <acquiredDate>03/10/2022</acquiredDate>
        <natureOfAcquisitionTransaction>compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>arch capital group</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>75758</amountOfSecuritiesAcquired>
        <paymentDate>03/10/2022</paymentDate>
        <natureOfPayment>cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>common</securitiesClassTitle>
        <acquiredDate>02/26/2022</acquiredDate>
        <natureOfAcquisitionTransaction>compensation</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>arch capital group</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>7239</amountOfSecuritiesAcquired>
        <paymentDate>02/26/2022</paymentDate>
        <natureOfPayment>cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>marc grandisson is executive selling the shares through a holding company called lone palm limited</remarks>
      <noticeSignature>
        <noticeDate>05/19/2023</noticeDate>
        <signature>/s/ UBS Financial Services Inc, as attorney-in-fact for marc grandisson</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4584}]
text: 144
  0001286007
  XXXXXXXX
  LIVE
  0000947484
  Arch Capital Group
  001-16209
  warterloo house ground floor
  100 pitts bay road
  pembroke
  D0
  hm08
  4412789250
  marc grandisson
  Officer
  common
  UBS Financial Services Inc
  1000 Harbor Blvd
  3rd Floor
  Weehawken
  NJ
  07086
  200000
  15220000
  372422622
  05/19/2023
  NASDAQ
  commone
  05/06/2022
  sar exercise
  arch capital group
  N
  54275
  05/06/2022
  cash
  common
  03/10/2022
  compensation
  arch capital group
  N
  62728
  03/10/2022
  cash
  common
  03/10/2022
  compensation
  arch capital group
  N
  75758
  03/10/2022
  cash
  common
  02/26/2022
  compensation
  arch capital group
  N
  7239
  02/26/2022
  cash
  Y
  marc grandisson is executive selling the shares through a holding company called lone palm limited
  05/19/2023
  /s/ UBS Financial Services Inc, as attorney-in-fact for marc grandisson