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

    <schemaVersion>X0206</schemaVersion>

    <documentType>3/A</documentType>

    <periodOfReport>2021-08-25</periodOfReport>

    <dateOfOriginalSubmission>2021-09-07</dateOfOriginalSubmission>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000943819</issuerCik>
        <issuerName>RESMED INC</issuerName>
        <issuerTradingSymbol>RMD</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001881922</rptOwnerCik>
            <rptOwnerName>Ghoshal Kaushik</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>RESMED INC.</rptOwnerStreet1>
            <rptOwnerStreet2>9001 SPECTRUM CENTER BLVD.</rptOwnerStreet2>
            <rptOwnerCity>SAN DIEGO</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>92123</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isOfficer>1</isOfficer>
            <officerTitle>President, SaaS Business</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>ResMed Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>7370</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>95.80</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2018-04-02</value>
            </exerciseDate>
            <expirationDate>
                <value>2025-04-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>2086</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>146.34</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2019-11-21</value>
            </exerciseDate>
            <expirationDate>
                <value>2026-11-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>683</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>211.76</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2020-11-19</value>
            </exerciseDate>
            <expirationDate>
                <value>2027-11-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>472</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>95.80</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2018-04-02</value>
            </exerciseDate>
            <expirationDate>
                <value>2025-04-02</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6877</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>101.64</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2018-11-14</value>
            </exerciseDate>
            <expirationDate>
                <value>2025-11-14</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10297</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>146.34</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2019-11-21</value>
            </exerciseDate>
            <expirationDate>
                <value>2026-11-21</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>7095</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>ResMed  Common Stock Options</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>211.76</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2020-11-19</value>
            </exerciseDate>
            <expirationDate>
                <value>2027-11-19</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>ResMed Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>10608</value>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Corrects the number of outstanding options as of September 1, 2021.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Kaushik Ghoshal, President SaaS Business</signatureName>
        <signatureDate>2021-10-13</signatureDate>
    </ownerSignature>
</ownershipDocument>
