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

    <schemaVersion>X0407</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2023-04-05</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001618756</issuerCik>
        <issuerName>Restaurant Brands International Inc.</issuerName>
        <issuerTradingSymbol>QSR</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001829353</rptOwnerCik>
            <rptOwnerName>Siddiqui Sami A.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5707 BLUE LAGOON DRIVE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>MIAMI</rptOwnerCity>
            <rptOwnerState>FL</rptOwnerState>
            <rptOwnerZipCode>33126</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Brand Pres., Popeyes, Americas</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <aff10b5One>0</aff10b5One>

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            </securityTitle>
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            </postTransactionAmounts>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
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                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

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                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeTransaction>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">These shares are held by a revocable trust, of which the Reporting Person is the settlor and trustee for the benefit of the Reporting Person.</footnote>
        <footnote id="F2">These options are immediately exercisable.</footnote>
        <footnote id="F3">Each restricted share unit represents a contingent right to receive one common share.</footnote>
        <footnote id="F4">Represents dividend equivalent rights that accrued on the underlying award of restricted share units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the restricted share units to which they relate.</footnote>
        <footnote id="F5">These restricted share units vest on December 31, 2023.</footnote>
        <footnote id="F6">These restricted share units vest on December 31, 2024.</footnote>
        <footnote id="F7">The shares reported represent an award of performance based restricted share units (&quot;2019 PBRSUs&quot;) granted to the Reporting Person. The 2019 PBRSUs have a performance period ending December 31, 2021 and will vest on February 21, 2024, which is the fifth anniversary of the grant date.</footnote>
        <footnote id="F8">Represents dividend equivalent rights that accrued on the underlying award of performance based restricted share units. Dividend equivalent rights accrue when and as dividends are paid on the common shares underlying the applicable performance based restricted share units and vest proportionately with and are subject to settlement and expiration upon the same terms as the performance based restricted share units to which they relate.</footnote>
        <footnote id="F9">The shares reported represent an award of performance based restricted share units (the &quot;2020-1 PBRSUs&quot;) granted to the Reporting Person. The 2020-1 PBRSUs have a performance period ending December 31, 2021 and will vest on February 21, 2025, which is the fifth anniversary of the grant date.</footnote>
        <footnote id="F10">The shares reported represent an award of performance based restricted share units (&quot;2020-2 PBRSUs&quot;) granted to the Reporting Person. The 2020-2 PBRSUs have a performance period ending December 31, 2021 and will vest on February 21, 2025.</footnote>
        <footnote id="F11">These restricted share units vest in equal installments on December 31, 2021, December 31, 2022 and December 2023.</footnote>
        <footnote id="F12">These restricted share units vest in equal installments on December 31, 2021, December 31, 2022, December 31, 2023 and December 31, 2024.</footnote>
        <footnote id="F13">The shares reported represent an award of performance based restricted share units (&quot;2021 PBRSUs&quot;) granted to the Reporting Person. The 2021 PBRSUs will have a performance period beginning January 1, 2021 and ending December 31, 2023 and to the extent earned will vest on February 19, 2024. The number of common shares that will be earned at the end of the performance period is subject to increase or decrease based on the results of the performance condition.</footnote>
        <footnote id="F14">These restricted share units vest in equal installments on December 31, 2022, December 31, 2023, December 31, 2024 and December 31, 2025.</footnote>
        <footnote id="F15">The shares reported represent an award of performance based restricted share units (&quot;2022 PBRSUs&quot;) granted to the Reporting Person. The 2022 PBRSUs will have a performance period beginning January 1, 2022 and ending December 31, 2024 and to the extent earned will vest on February 25, 2025. The number of common shares that will be earned at the end of the performance period is subject to increase or decrease based on the results of the performance condition.</footnote>
        <footnote id="F16">These restricted share units vest in equal installments on December 15, 2023, December 15, 2024, December 15, 2025 and December 15, 2026.</footnote>
        <footnote id="F17">The shares reported represent an award of performance based restricted share units (&quot;2023 PBRSUs&quot;) granted to the Reporting Person. The 2023 PBRSUs will have a performance period beginning January 1, 2023 and ending December 31, 2025 and to the extent earned will vest on February 22, 2026. The number of common shares that will be earned at the end of the performance period is subject to increase or decrease based on the results of the performance condition.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Michele Keusch, as Attorney-in-Fact for Sami A. Siddiqui</signatureName>
        <signatureDate>2023-04-07</signatureDate>
    </ownerSignature>
</ownershipDocument>
