-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 VcfmdM1Ljexmm54UuWyTQw==

<SEC-DOCUMENT>0001407851-10-000002.txt : 20100525
<SEC-HEADER>0001407851-10-000002.hdr.sgml : 20100525
<ACCEPTANCE-DATETIME>20100525063646
ACCESSION NUMBER:		0001407851-10-000002
CONFORMED SUBMISSION TYPE:	D
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20100525
DATE AS OF CHANGE:		20100525
EFFECTIVENESS DATE:		20100525

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Sun Life Assurance CO of Canada (US) Variable Account S
		CENTRAL INDEX KEY:			0001407851
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		D
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	021-142500
		FILM NUMBER:		10855564

	BUSINESS ADDRESS:	
		STREET 1:		One Sun Life Executive Park
		CITY:			Wellesley Hills
		STATE:			MA
		ZIP:			02481
		BUSINESS PHONE:		800-786-5433

	MAIL ADDRESS:	
		STREET 1:		One Sun Life Executive Park
		CITY:			Wellesley Hills
		STATE:			MA
		ZIP:			02481
</SEC-HEADER>
<DOCUMENT>
<TYPE>D
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0"?>
<edgarSubmission>

    <schemaVersion>X0704</schemaVersion>

    <submissionType>D</submissionType>

    <testOrLive>LIVE</testOrLive>

    <primaryIssuer>
        <cik>0001407851</cik>
        <entityName>Sun Life Assurance CO of Canada (US) Variable Account S</entityName>
        <issuerAddress>
            <street1>One Sun Life Executive Park</street1>
            <city>Wellesley Hills</city>
            <stateOrCountry>MA</stateOrCountry>
            <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
            <zipCode>02481</zipCode>
        </issuerAddress>
        <issuerPhoneNumber>800-786-5433</issuerPhoneNumber>
        <jurisdictionOfInc>DELAWARE</jurisdictionOfInc>
        <issuerPreviousNameList>
            <value>None</value>
        </issuerPreviousNameList>
        <edgarPreviousNameList>
            <value>None</value>
        </edgarPreviousNameList>
        <entityType>Other</entityType>
        <entityTypeOtherDesc>Separate Account S</entityTypeOtherDesc>
        <yearOfInc>
            <withinFiveYears>true</withinFiveYears>
            <value>2006</value>
        </yearOfInc>
    </primaryIssuer>

    <relatedPersonsList>
        <relatedPersonInfo>
            <relatedPersonName>
                <firstName>Sun</firstName>
                <lastName>Life Assurance Company of Canada (U.S.)</lastName>
            </relatedPersonName>
            <relatedPersonAddress>
                <street1>One Sun Life Executive Park</street1>
                <city>Wellesely Hills</city>
                <stateOrCountry>MA</stateOrCountry>
                <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                <zipCode>02481</zipCode>
            </relatedPersonAddress>
            <relatedPersonRelationshipList>
                <relationship>Promoter</relationship>
            </relatedPersonRelationshipList>
            <relationshipClarification>Sun Life Assurance Company of Canada (U.S.)</relationshipClarification>
        </relatedPersonInfo>
    </relatedPersonsList>

    <offeringData>
        <industryGroup>
            <industryGroupType>Other</industryGroupType>
        </industryGroup>
        <issuerSize>
            <revenueRange>$25,000,001 - $100,000,000</revenueRange>
        </issuerSize>
        <federalExemptionsExclusions>
            <item>06</item>
        </federalExemptionsExclusions>
        <typeOfFiling>
            <newOrAmendment>
                <isAmendment>false</isAmendment>
            </newOrAmendment>
            <dateOfFirstSale>
                <value>2007-04-19</value>
            </dateOfFirstSale>
        </typeOfFiling>
        <durationOfOffering>
            <moreThanOneYear>true</moreThanOneYear>
        </durationOfOffering>
        <typesOfSecuritiesOffered>
            <isOtherType>true</isOtherType>
            <descriptionOfOtherType>Flexible Premium Variable Universal Life Insurance and Variable Annuity</descriptionOfOtherType>
        </typesOfSecuritiesOffered>
        <businessCombinationTransaction>
            <isBusinessCombinationTransaction>false</isBusinessCombinationTransaction>
            <clarificationOfResponse></clarificationOfResponse>
        </businessCombinationTransaction>
        <minimumInvestmentAccepted>500000</minimumInvestmentAccepted>
        <salesCompensationList>
            <recipient>
                <recipientName>M Holdings Securities, Inc.</recipientName>
                <recipientCRDNumber>43285</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>1125 NW Couch Street</street1>
                    <city>Portland</city>
                    <stateOrCountry>OR</stateOrCountry>
                    <stateOrCountryDescription>OREGON</stateOrCountryDescription>
                    <zipCode>97209</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <value>All States</value>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
            <recipient>
                <recipientName>GA Financial, Inc.</recipientName>
                <recipientCRDNumber>42293</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>41 S High Street</street1>
                    <street2>Suite 3400</street2>
                    <city>Columbus</city>
                    <stateOrCountry>OH</stateOrCountry>
                    <stateOrCountryDescription>OHIO</stateOrCountryDescription>
                    <zipCode>43215-6101</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>NJ</state>
                    <description>NEW JERSEY</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
            <recipient>
                <recipientName>Becker &amp; Suffern, Ltd</recipientName>
                <recipientCRDNumber>39905</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>1245 W Causeway Approach</street1>
                    <city>Mandeville</city>
                    <stateOrCountry>LA</stateOrCountry>
                    <stateOrCountryDescription>LOUISIANA</stateOrCountryDescription>
                    <zipCode>70471-3041</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>LA</state>
                    <description>LOUISIANA</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
            <recipient>
                <recipientName>Commonwealth Financial Network</recipientName>
                <recipientCRDNumber>8032</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>29 Sawyer Road</street1>
                    <city>Waltham</city>
                    <stateOrCountry>MA</stateOrCountry>
                    <stateOrCountryDescription>MASSACHUSETTS</stateOrCountryDescription>
                    <zipCode>02453-3483</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>RI</state>
                    <description>RHODE ISLAND</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>HI</state>
                    <description>HAWAII</description>
                    <state>OR</state>
                    <description>OREGON</description>
                    <state>MA</state>
                    <description>MASSACHUSETTS</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
            <recipient>
                <recipientName>Geneos Wealth Management, Inc</recipientName>
                <recipientCRDNumber>120894</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>9055 E Mineral Circle</street1>
                    <street2>Suite 200</street2>
                    <city>Centennial</city>
                    <stateOrCountry>CO</stateOrCountry>
                    <stateOrCountryDescription>COLORADO</stateOrCountryDescription>
                    <zipCode>80112-3428</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>SC</state>
                    <description>SOUTH CAROLINA</description>
                    <state>VA</state>
                    <description>VIRGINIA</description>
                    <state>NY</state>
                    <description>NEW YORK</description>
                    <state>NC</state>
                    <description>NORTH CAROLINA</description>
                    <state>LA</state>
                    <description>LOUISIANA</description>
                    <state>DC</state>
                    <description>DISTRICT OF COLUMBIA</description>
                    <state>CO</state>
                    <description>COLORADO</description>
                    <state>OH</state>
                    <description>OHIO</description>
                    <state>OK</state>
                    <description>OKLAHOMA</description>
                    <state>MN</state>
                    <description>MINNESOTA</description>
                    <state>NE</state>
                    <description>NEBRASKA</description>
                    <state>NV</state>
                    <description>NEVADA</description>
                    <state>MD</state>
                    <description>MARYLAND</description>
                    <state>MI</state>
                    <description>MICHIGAN</description>
                    <state>TX</state>
                    <description>TEXAS</description>
                    <state>WA</state>
                    <description>WASHINGTON</description>
                    <state>AZ</state>
                    <description>ARIZONA</description>
                    <state>IL</state>
                    <description>ILLINOIS</description>
                    <state>OR</state>
                    <description>OREGON</description>
                    <state>NM</state>
                    <description>NEW MEXICO</description>
                    <state>IN</state>
                    <description>INDIANA</description>
                    <state>DE</state>
                    <description>DELAWARE</description>
                    <state>WV</state>
                    <description>WEST VIRGINIA</description>
                    <state>AL</state>
                    <description>ALABAMA</description>
                    <state>UT</state>
                    <description>UTAH</description>
                    <state>CA</state>
                    <description>CALIFORNIA</description>
                    <state>WY</state>
                    <description>WYOMING</description>
                    <state>PA</state>
                    <description>PENNSYLVANIA</description>
                    <state>ND</state>
                    <description>NORTH DAKOTA</description>
                    <state>FL</state>
                    <description>FLORIDA</description>
                    <state>CT</state>
                    <description>CONNECTICUT</description>
                    <state>KS</state>
                    <description>KANSAS</description>
                    <state>NJ</state>
                    <description>NEW JERSEY</description>
                    <state>SD</state>
                    <description>SOUTH DAKOTA</description>
                    <state>ME</state>
                    <description>MAINE</description>
                    <state>MO</state>
                    <description>MISSOURI</description>
                    <state>ID</state>
                    <description>IDAHO</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
            <recipient>
                <recipientName>FNBB Capital Markets, LLC</recipientName>
                <recipientCRDNumber>132091</recipientCRDNumber>
                <associatedBDName>None</associatedBDName>
                <associatedBDCRDNumber>None</associatedBDCRDNumber>
                <recipientAddress>
                    <street1>600 University Park PL</street1>
                    <street2>Suite 380</street2>
                    <city>Homewood</city>
                    <stateOrCountry>AL</stateOrCountry>
                    <stateOrCountryDescription>ALABAMA</stateOrCountryDescription>
                    <zipCode>35209-6774</zipCode>
                </recipientAddress>
                <statesOfSolicitationList>
                    <state>LA</state>
                    <description>LOUISIANA</description>
                </statesOfSolicitationList>
                <foreignSolicitation>false</foreignSolicitation>
            </recipient>
        </salesCompensationList>
        <offeringSalesAmounts>
            <totalOfferingAmount>Indefinite</totalOfferingAmount>
            <totalAmountSold>68056953</totalAmountSold>
            <totalRemaining>Indefinite</totalRemaining>
            <clarificationOfResponse></clarificationOfResponse>
        </offeringSalesAmounts>
        <investors>
            <hasNonAccreditedInvestors>false</hasNonAccreditedInvestors>
            <totalNumberAlreadyInvested>30</totalNumberAlreadyInvested>
        </investors>
        <salesCommissionsFindersFees>
            <salesCommissions>
                <dollarAmount>775203</dollarAmount>
                <isEstimate>true</isEstimate>
            </salesCommissions>
            <findersFees>
                <dollarAmount>0</dollarAmount>
            </findersFees>
            <clarificationOfResponse></clarificationOfResponse>
        </salesCommissionsFindersFees>
        <useOfProceeds>
            <grossProceedsUsed>
                <dollarAmount>0</dollarAmount>
            </grossProceedsUsed>
            <clarificationOfResponse></clarificationOfResponse>
        </useOfProceeds>
        <signatureBlock>
            <authorizedRepresentative>false</authorizedRepresentative>
            <signature>
                <issuerName>Sun Life Assurance CO of Canada (US) Variable Account S</issuerName>
                <signatureName>/s/ Debora M. Kelly</signatureName>
                <nameOfSigner>Debora M. Kelly</nameOfSigner>
                <signatureTitle>Marketing Operations Director</signatureTitle>
                <signatureDate>2010-05-25</signatureDate>
            </signature>
        </signatureBlock>
    </offeringData>
</edgarSubmission>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----