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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2019-03-21</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0001758488</issuerCik>
        <issuerName>ONESPAWORLD HOLDINGS Ltd</issuerName>
        <issuerTradingSymbol>OSW</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001018946</rptOwnerCik>
            <rptOwnerName>STEINER LEISURE Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>SUITE 104A, SAFFREY SQUARE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NASSAU</rptOwnerCity>
            <rptOwnerState>C5</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>BAHAMAS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001770500</rptOwnerCik>
            <rptOwnerName>Nemo Parent, Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O LENNOX PATON CORPORATE SERVICES LTD.</rptOwnerStreet1>
            <rptOwnerStreet2>3 BAYSIDE EXECUTIVE PARK</rptOwnerStreet2>
            <rptOwnerCity>WEST BAY STREET, NASSAU</rptOwnerCity>
            <rptOwnerState>D0</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>BERMUDA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001770497</rptOwnerCik>
            <rptOwnerName>Nemo Investor Aggregator, Ltd</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MOURANT OZANNES CORPORATE SERVICES</rptOwnerStreet1>
            <rptOwnerStreet2>94 SOLARIS AVENUE, PO BOX 1348</rptOwnerStreet2>
            <rptOwnerCity>CAMANA BAY, GRAND CAYMAN</rptOwnerCity>
            <rptOwnerState>E9</rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription>CAYMAN ISLANDS</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock, par value $0.0001 per share</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>8198130</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>Steiner Leisure Funds</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Warrants</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F4"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <value>2024-03-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Shares</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>1486520</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Steiner Leisure Limited is 100% owned by Nemo Parent, Inc., an international business company incorporated under the laws of the Commonwealth of the Bahamas. Nemo Parent, Inc. is 100% owned by Nemo Investor Aggregator, Limited, a Cayman Islands exempted company. Nemo Investor Aggregator, Limited is governed by a board of directors consisting of seven directors. Each director has one vote, and the approval of a majority of the directors is required to approve an action of Nemo Investor Aggregator, Limited. Under the so-called &quot;rule of three,&quot; if voting and dispositive decisions regarding an entity's securities are made by three or more individuals, and a voting or dispositive decision requires the approval of a majority of those individuals, then none of the individuals is deemed a beneficial owner of the entity's securities.</footnote>
        <footnote id="F2">(Continued from Footonte 1) Based upon the foregoing analysis, no director of Nemo Investor Aggregator, Limited exercises voting or dispositive control over any of the securities held by Steiner Leisure, even those in which he or she directly holds a pecuniary interest. Accordingly, none of them will be deemed to have or share beneficial ownership of such shares. The address for Steiner Leisure is Suite 104A, Saffrey Square, Nassau, The Bahamas. The address for Nemo Investor Aggregator, Limited is c/o Mourant Ozannes Corporate Services (Cayman) Ltd., 94 Solaris Avenue, PO Box 1348, Camana Bay, Grand Cayman KY1-1108, Cayman Islands. The address for Nemo Parent, Inc. is c/o Lennox Paton Corporate Services Ltd., 3 Bayside Executive Park, West Bay Street, Nassau, The Bahamas.</footnote>
        <footnote id="F3">Pursuant to the Amended and Restated Warrant Agreement, dated as of March 19, 2019, between the issuer and Continental Stock Transfer &amp; Trust Company, the warrants may not be exercised unless a registration statement under the Securities Act of 1933, as amended, with respect to the shares underlying the warrants is effective and a prospectus relating thereto is current.</footnote>
        <footnote id="F4">Each warrant is exercisable for one Common Share at an exercise price of $11.50 per share.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>STEINER LEISURE LIMITED
/s/ Marc Magliacano, Vice President and Assistant Secretary</signatureName>
        <signatureDate>2019-03-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>NEMO PARENT, INC.
/s/ Marc Magliacano, Vice President</signatureName>
        <signatureDate>2019-03-21</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>NEMO INVESTOR AGGREGATOR, LIMITED
/s/ Marc Magliacano, Executive Vice President and Secretary</signatureName>
        <signatureDate>2019-03-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
