<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144/A</submissionType>
        <previousAccessionNumber>0001950047-25-003422</previousAccessionNumber>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001757685</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001758009</issuerCik>
            <issuerName>Quantum Computing Inc</issuerName>
            <secFileNumber>001-40615</secFileNumber>
            <issuerAddress>
                <ns2:street1>5 Marine View Plaza</ns2:street1>
                <ns2:street2>Suite 214</ns2:street2>
                <ns2:city>Hoboken</ns2:city>
                <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                <ns2:zipCode>07030</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(703) 436-2121</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>CHRISTOPHER ROBERTS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Outside Counsel and Consultant</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>37467</noOfUnitsSold>
            <aggregateMarketValue>468337.50</aggregateMarketValue>
            <noOfUnitsOutstanding>140903536</noOfUnitsOutstanding>
            <approxSaleDate>05/23/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/16/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of options under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>37467</amountOfSecuritiesAcquired>
            <paymentDate>04/16/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/22/2025</saleDate>
            <amountOfSecuritiesSold>13094</amountOfSecuritiesSold>
            <grossProceeds>163675.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>100000</amountOfSecuritiesSold>
            <grossProceeds>1265000.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>50000</amountOfSecuritiesSold>
            <grossProceeds>632500.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>50000</amountOfSecuritiesSold>
            <grossProceeds>632500.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/20/2025</saleDate>
            <amountOfSecuritiesSold>50000</amountOfSecuritiesSold>
            <grossProceeds>632500.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>CHRISTOPHER ROBERTS</name>
                <address>
                    <ns2:street1>5 Marine View Plaza</ns2:street1>
                    <ns2:street2>Suite 214</ns2:street2>
                    <ns2:city>Hoboken</ns2:city>
                    <ns2:stateOrCountry>NJ</ns2:stateOrCountry>
                    <ns2:zipCode>07030</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2025</saleDate>
            <amountOfSecuritiesSold>65451</amountOfSecuritiesSold>
            <grossProceeds>776641.57</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>This Form 144/A amends the Form 144 filed on May 23, 2025.  Since July 1, 2023, Christopher Roberts has served as outside legal counsel to the Company.  In this role, the company does not consider him to be an affiliate of the company.  As such, the Forms 144 that Mr. Roberts filed on May 19 through May 23 were filed in error.</remarks>
        <noticeSignature>
            <noticeDate>06/12/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Christopher Bruce Roberts</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
