<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0508</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2026-02-18</periodOfReport>

    <issuer>
        <issuerCik>0001860742</issuerCik>
        <issuerName>Bausch &amp; Lomb Corp</issuerName>
        <issuerTradingSymbol>BLCO</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001877701</rptOwnerCik>
            <rptOwnerName>Hashad Yehia</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O BAUSCH + LOMB CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>520 APPLEWOOD CRESCENT</rptOwnerStreet2>
            <rptOwnerCity>VAUGHAN</rptOwnerCity>
            <rptOwnerState>A6</rptOwnerState>
            <rptOwnerZipCode>L4K4B4</rptOwnerZipCode>
            <rptOwnerStateDescription>ONTARIO, CANADA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>EVP of R&amp;D and CMO</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Shares, No Par Value</value>
            </securityTitle>
            <transactionDate>
                <value>2026-02-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness></transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>29406</value>
                    <footnoteId id="F1"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>163860</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents common shares, no par value, of Bausch + Lomb Corporation underlying an award of performance stock units (&quot;PSUs&quot;) originally granted to the reporting person on March 1, 2023 under the Bausch + Lomb Corporation 2022 Omnibus Incentive Plan, as amended and restated, that satisfied the applicable performance conditions as of February 18, 2026. The earned PSUs will vest on March 1, 2026, subject generally to the reporting person's continued employment through such date.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ Debra E. Levin, attorney-in-fact</signatureName>
        <signatureDate>2026-02-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
