<?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>0001227099</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
        <liveTestFlag>LIVE</liveTestFlag>




                </filerInfo>
    </headerData>

     <formData>
        <issuerInfo>
            <issuerCik>0000947484</issuerCik>
			<issuerName>ARCH CAPITAL GROUP LTD.</issuerName>


			    <secFileNumber>001-16209</secFileNumber>


			<issuerAddress>
				<com:street1>360 HAMILTON AVENUE</com:street1>
                				<com:street2>SUITE 600</com:street2>
                				<com:city>WHITE PLAINS</com:city>
				<com:stateOrCountry>NY</com:stateOrCountry>
				<com:zipCode>10601-2908</com:zipCode>
			</issuerAddress>

			<issuerContactPhone>914-872-3643</issuerContactPhone>
			<nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>John Murray Pasquesi</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>

			<relationshipsToIssuer>
                                				    <relationshipToIssuer>Director</relationshipToIssuer>
                                                                                    <relationshipToIssuer>CHAIR</relationshipToIssuer>

			</relationshipsToIssuer>
		</issuerInfo>

				          <securitiesInformation>
			<securitiesClassTitle>Common Shares, $.0011 par value per share</securitiesClassTitle>
			<brokerOrMarketmakerDetails>
				<name>APEX CLEARING</name>
				<address>
				<com:street1>350 N St Paul </com:street1>
                				<com:street2>Suite 300</com:street2>
                				<com:city>Dallas</com:city>
				<com:stateOrCountry>TX</com:stateOrCountry>
				<com:zipCode>75201</com:zipCode>
				</address>
			</brokerOrMarketmakerDetails>
			<noOfUnitsSold>75060</noOfUnitsSold>
			<aggregateMarketValue>7056060.33</aggregateMarketValue>
			<noOfUnitsOutstanding>375357236</noOfUnitsOutstanding>
			<approxSaleDate>05/12/2025</approxSaleDate>
			<securitiesExchangeName>Nasdaq</securitiesExchangeName>
		</securitiesInformation>

    		       <securitiesToBeSold>
         <securitiesClassTitle>Common Shares, $.0011 par value per share</securitiesClassTitle>
         <acquiredDate>05/09/2024</acquiredDate>
         <natureOfAcquisitionTransaction>Restricted Stock Award</natureOfAcquisitionTransaction>
                  <nameOfPersonfromWhomAcquired>Arch Capital Group Ltd.</nameOfPersonfromWhomAcquired>
                  <isGiftTransaction>N</isGiftTransaction>
		          <amountOfSecuritiesAcquired>75060</amountOfSecuritiesAcquired>
                  <paymentDate>05/09/2024</paymentDate>
                  <natureOfPayment>no payment - time based award</natureOfPayment>
      </securitiesToBeSold>

    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>



        <noticeSignature>
            <noticeDate>05/12/2025</noticeDate>
                        <signature>  /s/ John Pasquesi</signature>
        </noticeSignature>
	</formData>
    </edgarSubmission>
