<?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</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001610197</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001357615</issuerCik>
            <issuerName>KBR INC.</issuerName>
            <secFileNumber>001-33146</secFileNumber>
            <issuerAddress>
                <ns2:street1>601 Jefferson Street Suite 3400</ns2:street1>
                <ns2:city>Houston</ns2:city>
                <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                <ns2:zipCode>77002</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(713) 753-2000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>STUART BRADIE</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</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>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>900</noOfUnitsSold>
            <aggregateMarketValue>53283.96</aggregateMarketValue>
            <noOfUnitsOutstanding>135722134</noOfUnitsOutstanding>
            <approxSaleDate>05/23/2023</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/23/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Options under an Issuer S-8 Registered Plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>900</amountOfSecuritiesAcquired>
            <paymentDate>05/23/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>STUART BRADIE</name>
                <address>
                    <ns2:street1>601 Jefferson Street Suite 3400</ns2:street1>
                    <ns2:city>Houston</ns2:city>
                    <ns2:stateOrCountry>TX</ns2:stateOrCountry>
                    <ns2:zipCode>77002</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/18/2023</saleDate>
            <amountOfSecuritiesSold>2387</amountOfSecuritiesSold>
            <grossProceeds>142046.07</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>05/23/2023</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Stuart John Baxter Bradie</signature>
        </noticeSignature>
    </formData>
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144
0001610197
XXXXXXXX
LIVE
0001357615
KBR INC.
001-33146
601 Jefferson Street Suite 3400
Houston
TX
77002
(713) 753-2000
STUART BRADIE
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
900
53283.96
135722134
05/23/2023
NYSE
Common
05/23/2023
Exercise of Options under an Issuer S-8 Registered Plan
Issuer
N
900
05/23/2023
Cash
N
STUART BRADIE
601 Jefferson Street Suite 3400
Houston
TX
77002
Common
05/18/2023
2387
142046.07
05/23/2023
/s/ Stuart John Baxter Bradie