<?xml version="1.0" encoding="us-ascii"?>
<!-- EDGAR Online I-Metrix Xcelerate Risk Return XBRL Schema Document, based on XBRL 2.1  http://www.edgar-online.com/ -->
<!-- Created (UTC): 6/2/2012 12:58:39 AM -->
<!-- XBRL File Set ID: d8cf6548-41ad-4bef-a960-8fc6c2b106bc -->
<!-- App Version: 3.0.0.183, 5.1.2600.196608, 14.0 -->
<!-- Copyright (c) 2005-2012 EDGAR Online, Inc. All Rights Reserved. -->
<schema xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:us-types="http://xbrl.us/us-types/2009-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:ck0000863032="http://www.mfs.com/20120530" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:rr="http://xbrl.sec.gov/rr/2010-02-28" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.mfs.com/20120530" xmlns="http://www.w3.org/2001/XMLSchema">
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
  <import schemaLocation="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-types-2009-01-31.xsd" namespace="http://xbrl.us/us-types/2009-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/rr/2010/rr-2010-02-28.xsd" namespace="http://xbrl.sec.gov/rr/2010-02-28" />
  <import schemaLocation="http://www.xbrl.org/lrr/role/negated-2008-03-31.xsd" namespace="http://xbrl.us/us-gaap/negated/2008-03-31" />
  <import schemaLocation="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd" namespace="http://xbrl.us/dei/2009-01-31" />
  <annotation>
    <appinfo>
      <link:linkbaseRef xlink:type="simple" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ck0000863032-20120530_lab.xml" xlink:title="Label Links, all" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" />
      <link:linkbaseRef xlink:type="simple" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ck0000863032-20120530_def.xml" xlink:title="Definition Links, all" />
      <link:linkbaseRef xlink:type="simple" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="ck0000863032-20120530_pre.xml" xlink:title="Presentation Links, all" />
      <link:roleType roleURI="http://www.mfs.com/20120530/role/DocumentDocumentandEntityInformation" id="DocumentDocumentandEntityInformation" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>0011 - Document - Document And Entity Information {Elements}</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/RiskReturn_P0001-S000002469Member" id="RiskReturn_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010005 - Document - Risk/Return Summary {Unlabeled} (MFS Global Total Return Fund (Prospectus Summary):)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/ShareholderFeesData_P0001-S000002469Member" id="ShareholderFeesData_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010010 - Schedule - Shareholder Fees</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/OperatingExpensesData_P0001-S000002469Member" id="OperatingExpensesData_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010015 - Schedule - Annual Fund Operating Expenses</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/ExpenseExample_P0001-S000002469Member" id="ExpenseExample_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010020 - Schedule - Expense Example {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/ExpenseExampleNoRedemption_P0001-S000002469Member" id="ExpenseExampleNoRedemption_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010025 - Schedule - Expense Example, No Redemption {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/BarChartData_P0001-S000002469Member" id="BarChartData_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010030 - Schedule - Annual Total Returns</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.mfs.com/20120530/role/PerformanceTableData_P0001-S000002469Member" id="PerformanceTableData_P0001-S000002469Member" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>010035 - Schedule - Average Annual Total Returns {Transposed}</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </appinfo>
  </annotation>
  <element id="ck0000863032_AutoMarketIndexMember" xbrli:periodType="duration" name="AutoMarketIndexMember" nillable="true" substitutionGroup="xbrli:item" type="us-types:domainItemType" />
  <element id="ck0000863032_AverageAnnualReturnsInceptionDateSecondary" xbrli:periodType="duration" name="AverageAnnualReturnsInceptionDateSecondary" nillable="true" substitutionGroup="xbrli:item" type="xbrli:dateItemType" />
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  <element id="ck0000863032_AverageAnnualReturnYear03" xbrli:periodType="duration" name="AverageAnnualReturnYear03" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" />
  <element id="ck0000863032_AverageAnnualReturnYTD" xbrli:periodType="duration" name="AverageAnnualReturnYTD" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" />
  <element id="ck0000863032_BeforeNetOtherOperatingExpense" xbrli:periodType="duration" name="BeforeNetOtherOperatingExpense" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
  <element id="ck0000863032_Component4OtherExpenses" xbrli:periodType="duration" name="Component4OtherExpenses" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
  <element id="ck0000863032_Component5OtherExpenses" xbrli:periodType="duration" name="Component5OtherExpenses" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
  <element id="ck0000863032_ExpenseExampleByYearNoExpenseReimbursementColumn" xbrli:periodType="duration" name="ExpenseExampleByYearNoExpenseReimbursementColumn" nillable="true" substitutionGroup="xbrli:item" type="us-types:textBlockItemType" />
  <element id="ck0000863032_ExpenseExampleNoRedemptionNoExpenseReimbursement10Years" xbrli:periodType="duration" name="ExpenseExampleNoRedemptionNoExpenseReimbursement10Years" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_ExpenseExampleNoRedemptionNoExpenseReimbursement1Year" xbrli:periodType="duration" name="ExpenseExampleNoRedemptionNoExpenseReimbursement1Year" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_ExpenseExampleNoRedemptionNoExpenseReimbursement3Years" xbrli:periodType="duration" name="ExpenseExampleNoRedemptionNoExpenseReimbursement3Years" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
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  <element id="ck0000863032_ExpenseExampleYear02" xbrli:periodType="duration" name="ExpenseExampleYear02" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
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  <element id="ck0000863032_ExpenseExampleYear04" xbrli:periodType="duration" name="ExpenseExampleYear04" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_ExpenseExampleNoRedemptionYear04" xbrli:periodType="duration" name="ExpenseExampleNoRedemptionYear04" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_ExpenseExampleWithRedemptionNoExpenseReimbursementYear02" xbrli:periodType="duration" name="ExpenseExampleWithRedemptionNoExpenseReimbursementYear02" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_ExpenseExampleWithRedemptionNoExpenseReimbursementYear04" xbrli:periodType="duration" name="ExpenseExampleWithRedemptionNoExpenseReimbursementYear04" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
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  <element id="ck0000863032_OperatingExpensesAdditionalExpense2" xbrli:periodType="duration" name="OperatingExpensesAdditionalExpense2" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
  <element id="ck0000863032_PurchaseFee" xbrli:periodType="duration" name="PurchaseFee" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativeMonetaryType" />
  <element id="ck0000863032_PurchaseFeeAsPercentageAmountInvested" xbrli:periodType="duration" name="PurchaseFeeAsPercentageAmountInvested" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
  <element id="ck0000863032_RecoupmentOverAssets" xbrli:periodType="duration" name="RecoupmentOverAssets" nillable="true" substitutionGroup="xbrli:item" type="rr:NonNegativePure4Type" />
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