<XBRL>
<?xml version="1.0" encoding="us-ascii" standalone="no"?>
<!--XBRL document created with Bowne Tagger XBRL Enabler by Bowne Software version 10.0.0.31-->
<!--Based on XBRL 2.1-->
<!--Created on: 4/22/2009 10:49:04 AM-->
<!--Modified on: 2/9/2010 2:47:12 PM-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#IncomeTaxes" roleURI="http://biogenidec.com/role/IncomeTaxes" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#BalanceSheets" roleURI="http://biogenidec.com/role/BalanceSheets" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#BalanceSheetsParenthetical" roleURI="http://biogenidec.com/role/BalanceSheetsParenthetical" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#StatementsOfCashFlows" roleURI="http://biogenidec.com/role/StatementsOfCashFlows" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#DocumentAndEntityInformation" roleURI="http://biogenidec.com/role/DocumentAndEntityInformation" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Inventory" roleURI="http://biogenidec.com/role/Inventory" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#EarningsPerShare" roleURI="http://biogenidec.com/role/EarningsPerShare" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#ShareBasedPayments" roleURI="http://biogenidec.com/role/ShareBasedPayments" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Collaborations" roleURI="http://biogenidec.com/role/Collaborations" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Litigation" roleURI="http://biogenidec.com/role/Litigation" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#SegmentInformation" roleURI="http://biogenidec.com/role/SegmentInformation" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#StatementsOfIncome" roleURI="http://biogenidec.com/role/StatementsOfIncome" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#ShareholdersEquity" roleURI="http://biogenidec.com/role/ShareholdersEquity" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#StatementsOfShareholdersEquity" roleURI="http://biogenidec.com/role/StatementsOfShareholdersEquity" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#CommitmentsAndContingencies" roleURI="http://biogenidec.com/role/CommitmentsAndContingencies" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Guarantees" roleURI="http://biogenidec.com/role/Guarantees" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#AcquisitionsAndDispositions" roleURI="http://biogenidec.com/role/AcquisitionsAndDispositions" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#AccumulatedOtherComprehensiveIncomeLoss" roleURI="http://biogenidec.com/role/AccumulatedOtherComprehensiveIncomeLoss" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#EmployeeBenefitPlans" roleURI="http://biogenidec.com/role/EmployeeBenefitPlans" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#QuarterlyFinancialData" roleURI="http://biogenidec.com/role/QuarterlyFinancialData" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#SummaryOfSignificantAccountingPolicies" roleURI="http://biogenidec.com/role/SummaryOfSignificantAccountingPolicies" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#OtherConsolidatedFinancialStatementDetail" roleURI="http://biogenidec.com/role/OtherConsolidatedFinancialStatementDetail" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#NewAccountingPronouncements" roleURI="http://biogenidec.com/role/NewAccountingPronouncements" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#DerivativeInstruments" roleURI="http://biogenidec.com/role/DerivativeInstruments" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#FinancialInstruments" roleURI="http://biogenidec.com/role/FinancialInstruments" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#FairValueMeasurements" roleURI="http://biogenidec.com/role/FairValueMeasurements" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#IntangibleAssetsAndGoodwill" roleURI="http://biogenidec.com/role/IntangibleAssetsAndGoodwill" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Reserves" roleURI="http://biogenidec.com/role/Reserves" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Indebtedness" roleURI="http://biogenidec.com/role/Indebtedness" />
  <roleRef xlink:type="simple" xlink:href="biib-20091231.xsd#Equity" roleURI="http://biogenidec.com/role/Equity" />
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/IncomeTaxes" xlink:title="0616 - Disclosure - Income Taxes">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitAbstract" xlink:label="loc_IncomeTaxExpenseBenefitAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock" xlink:label="loc_IncomeTaxDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeTaxExpenseBenefitAbstract" xlink:to="loc_IncomeTaxDisclosureTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/BalanceSheets" xlink:title="02 - Statement - Consolidated Balance Sheets">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_StatementOfFinancialPositionAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_AssetsAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfFinancialPositionAbstract" xlink:to="loc_AssetsAbstract" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_AssetsCurrentAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_AssetsCurrentAbstract" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_CashAndCashEquivalentsAtCarryingValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_CashAndCashEquivalentsAtCarryingValue" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MarketableSecuritiesCurrent" xlink:label="loc_MarketableSecuritiesCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_MarketableSecuritiesCurrent" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CollateralReceivedForLoanedSecurities" xlink:label="biib_CollateralReceivedForLoanedSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="biib_CollateralReceivedForLoanedSecurities" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccountsReceivableNetCurrent" xlink:label="loc_AccountsReceivableNetCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_AccountsReceivableNetCurrent" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_DueFromUnconsolidatedJointBusiness" xlink:label="biib_DueFromUnconsolidatedJointBusiness" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="biib_DueFromUnconsolidatedJointBusiness" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_LoanedSecurities" xlink:label="biib_LoanedSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="biib_LoanedSecurities" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InventoryNet" xlink:label="loc_InventoryNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_InventoryNet" order="140" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherAssetsCurrent" xlink:label="loc_OtherAssetsCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_OtherAssetsCurrent" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AssetsCurrent" xlink:label="loc_AssetsCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_AssetsCurrent" order="180" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MarketableSecuritiesNoncurrent" xlink:label="loc_MarketableSecuritiesNoncurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_MarketableSecuritiesNoncurrent" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet" xlink:label="loc_PropertyPlantAndEquipmentNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_PropertyPlantAndEquipmentNet" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill" xlink:label="loc_IntangibleAssetsNetExcludingGoodwill" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_IntangibleAssetsNetExcludingGoodwill" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_Goodwill" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_Goodwill" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherAssetsNoncurrent" xlink:label="loc_OtherAssetsNoncurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_OtherAssetsNoncurrent" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Assets" xlink:label="loc_Assets" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsAbstract" xlink:to="loc_Assets" order="140" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_LiabilitiesAndStockholdersEquityAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfFinancialPositionAbstract" xlink:to="loc_LiabilitiesAndStockholdersEquityAbstract" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract" xlink:label="loc_LiabilitiesCurrentAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_LiabilitiesCurrentAbstract" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CollateralPayableOnLoanedSecurities" xlink:label="biib_CollateralPayableOnLoanedSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="biib_CollateralPayableOnLoanedSecurities" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccountsPayableCurrent" xlink:label="loc_AccountsPayableCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="loc_AccountsPayableCurrent" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TaxesPayableCurrent" xlink:label="loc_TaxesPayableCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="loc_TaxesPayableCurrent" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherLiabilitiesCurrent" xlink:label="loc_OtherLiabilitiesCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="loc_OtherLiabilitiesCurrent" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NotesPayableCurrent" xlink:label="loc_NotesPayableCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="loc_NotesPayableCurrent" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LiabilitiesCurrent" xlink:label="loc_LiabilitiesCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesCurrentAbstract" xlink:to="loc_LiabilitiesCurrent" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LongTermNotesPayable" xlink:label="loc_LongTermNotesPayable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_LongTermNotesPayable" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredTaxLiabilitiesNoncurrent" xlink:label="loc_DeferredTaxLiabilitiesNoncurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_DeferredTaxLiabilitiesNoncurrent" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent" xlink:label="loc_OtherLiabilitiesNoncurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_OtherLiabilitiesNoncurrent" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Liabilities" xlink:label="loc_Liabilities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_Liabilities" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommitmentsAndContingencies2009" xlink:label="loc_CommitmentsAndContingencies2009" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_CommitmentsAndContingencies2009" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" order="140" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockValue" xlink:label="loc_PreferredStockValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockValue" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockValue" xlink:label="loc_CommonStockValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_CommonStockValue" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdditionalPaidInCapital" xlink:label="loc_AdditionalPaidInCapital" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_AdditionalPaidInCapital" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax" xlink:label="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_AccumulatedOtherComprehensiveIncomeLossNetOfTax" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit" xlink:label="loc_RetainedEarningsAccumulatedDeficit" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_RetainedEarningsAccumulatedDeficit" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockValue" xlink:label="us-gaap_TreasuryStockValue_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="us-gaap_TreasuryStockValue_2" order="120" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negatedTotal" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquity" xlink:label="loc_StockholdersEquity" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_StockholdersEquity" order="140" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MinorityInterest" xlink:label="loc_MinorityInterest" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_MinorityInterest" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="180" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity" xlink:label="loc_LiabilitiesAndStockholdersEquity" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_LiabilitiesAndStockholdersEquityAbstract" xlink:to="loc_LiabilitiesAndStockholdersEquity" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/BalanceSheetsParenthetical" xlink:title="021 - Statement - Consolidated Balance Sheets (Parenthetical)">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract" xlink:label="loc_StatementOfFinancialPositionAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfFinancialPositionAbstract" xlink:to="loc_StatementTable" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementLineItems" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" order="10" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_CommonStockParOrStatedValuePerShare" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_CommonStockParOrStatedValuePerShare" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_PreferredStockParOrStatedValuePerShare" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockParOrStatedValuePerShare" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_AssetsCurrentAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_AssetsCurrentAbstract" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_AllowanceForDoubtfulAccountsReceivableCurrent" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AssetsCurrentAbstract" xlink:to="loc_AllowanceForDoubtfulAccountsReceivableCurrent" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockSharesOutstanding" xlink:label="loc_CommonStockSharesOutstanding" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_CommonStockSharesOutstanding" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_CommonStockSharesIssued" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_CommonStockSharesIssued" order="12.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_CommonStockSharesAuthorized" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_CommonStockSharesAuthorized" order="11.25" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_StatementClassOfStockAxis" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementClassOfStockAxis" order="10" use="optional" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_ClassOfStockDomain" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementClassOfStockAxis" xlink:to="loc_ClassOfStockDomain" order="6" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockLiquidationPreference" xlink:label="loc_PreferredStockLiquidationPreference" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockLiquidationPreference" order="7.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockSharesOutstanding" xlink:label="loc_PreferredStockSharesOutstanding" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockSharesOutstanding" order="6.25" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockSharesIssued" xlink:label="loc_PreferredStockSharesIssued" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockSharesIssued" order="5.625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_PreferredStockSharesAuthorized" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_PreferredStockSharesAuthorized" order="5.3125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockShares" xlink:label="loc_TreasuryStockShares" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_TreasuryStockShares" order="35" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_SeriesXPreferredStockMember" xlink:label="biib_SeriesXPreferredStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ClassOfStockDomain" xlink:to="biib_SeriesXPreferredStockMember" order="7.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="us-gaap_SeriesAPreferredStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ClassOfStockDomain" xlink:to="us-gaap_SeriesAPreferredStockMember" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/StatementsOfCashFlows" xlink:title="03 - Statement - Consolidated Statements of Cash Flows">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract" xlink:label="loc_StatementOfCashFlowsAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_ProfitLoss" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_ProfitLoss" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:label="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DepreciationAndAmortization" xlink:label="loc_DepreciationAndAmortization" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_DepreciationAndAmortization" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResearchAndDevelopmentInProcess" xlink:label="loc_ResearchAndDevelopmentInProcess" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_ResearchAndDevelopmentInProcess" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensation" xlink:label="loc_ShareBasedCompensation" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_ShareBasedCompensation" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CashReceivedUponTerminationOfInterestSwap" xlink:label="biib_CashReceivedUponTerminationOfInterestSwap" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="biib_CashReceivedUponTerminationOfInterestSwap" order="65" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherNoncashExpense" xlink:label="loc_OtherNoncashExpense" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_OtherNoncashExpense" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit" xlink:label="loc_DeferredIncomeTaxExpenseBenefit" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_DeferredIncomeTaxExpenseBenefit" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GainLossOnInvestments" xlink:label="loc_GainLossOnInvestments" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_GainLossOnInvestments" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InventoryWriteDown" xlink:label="loc_InventoryWriteDown" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_InventoryWriteDown" order="140" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GainsLossesOnSalesOfAssets" xlink:label="loc_GainsLossesOnSalesOfAssets" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_GainsLossesOnSalesOfAssets" order="141.25" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ImpairmentOfInvestments" xlink:label="loc_ImpairmentOfInvestments" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_ImpairmentOfInvestments" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" xlink:label="loc_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities" order="180" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract" xlink:label="loc_IncreaseDecreaseInOperatingCapitalAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_IncreaseDecreaseInOperatingCapitalAbstract" order="187.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsReceivable" xlink:label="loc_IncreaseDecreaseInAccountsReceivable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="loc_IncreaseDecreaseInAccountsReceivable" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IncreaseDecreaseInDueFromUnconsolidatedJointBusiness" xlink:label="biib_IncreaseDecreaseInDueFromUnconsolidatedJointBusiness" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="biib_IncreaseDecreaseInDueFromUnconsolidatedJointBusiness" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInInventories" xlink:label="loc_IncreaseDecreaseInInventories" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="loc_IncreaseDecreaseInInventories" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingAssets" xlink:label="loc_IncreaseDecreaseInOtherOperatingAssets" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="loc_IncreaseDecreaseInOtherOperatingAssets" order="80" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedLiabilities" xlink:label="loc_IncreaseDecreaseInAccruedLiabilities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="loc_IncreaseDecreaseInAccruedLiabilities" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingLiabilities" xlink:label="loc_IncreaseDecreaseInOtherOperatingLiabilities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncreaseDecreaseInOperatingCapitalAbstract" xlink:to="loc_IncreaseDecreaseInOtherOperatingLiabilities" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_NetCashProvidedByUsedInOperatingActivities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract" xlink:to="loc_NetCashProvidedByUsedInOperatingActivities" order="199.84375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:label="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToAcquireMarketableSecurities" xlink:label="us-gaap_PaymentsToAcquireMarketableSecurities_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireMarketableSecurities_2" order="20" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities" xlink:label="loc_ProceedsFromSaleAndMaturityOfMarketableSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="loc_ProceedsFromSaleAndMaturityOfMarketableSecurities" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired" xlink:label="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_2" order="80" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_2" order="100" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment" xlink:label="loc_ProceedsFromSaleOfPropertyPlantAndEquipment" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="loc_ProceedsFromSaleOfPropertyPlantAndEquipment" order="120" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToAcquireOtherInvestments" xlink:label="us-gaap_PaymentsToAcquireOtherInvestments_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_PaymentsToAcquireOtherInvestments_2" order="140" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ProceedsFromSaleOfStrategicEquityInvestment" xlink:label="biib_ProceedsFromSaleOfStrategicEquityInvestment" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="biib_ProceedsFromSaleOfStrategicEquityInvestment" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CollateralReceivedUnderSecuritiesLending" xlink:label="biib_CollateralReceivedUnderSecuritiesLending" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="biib_CollateralReceivedUnderSecuritiesLending" order="170" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInInvestingActivitiesAbstract" xlink:to="us-gaap_NetCashProvidedByUsedInInvestingActivities_2" order="180" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" order="17.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsForRepurchaseOfCommonStock" xlink:label="loc_PaymentsForRepurchaseOfCommonStock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_PaymentsForRepurchaseOfCommonStock" order="20" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans" xlink:label="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProceedsFromRepaymentsOfBankOverdrafts" xlink:label="loc_ProceedsFromRepaymentsOfBankOverdrafts" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_ProceedsFromRepaymentsOfBankOverdrafts" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" xlink:label="loc_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProceedsFromShortTermDebt" xlink:label="loc_ProceedsFromShortTermDebt" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_ProceedsFromShortTermDebt" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RepaymentsOfShortTermDebt" xlink:label="loc_RepaymentsOfShortTermDebt" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_RepaymentsOfShortTermDebt" order="120" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt" xlink:label="loc_RepaymentsOfLongTermDebt" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_RepaymentsOfLongTermDebt" order="130" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PaymentsToMinorityShareholders" xlink:label="loc_PaymentsToMinorityShareholders" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_PaymentsToMinorityShareholders" order="135" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negated" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ObligationUnderSecuritiesLending" xlink:label="biib_ObligationUnderSecuritiesLending" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="biib_ObligationUnderSecuritiesLending" order="140" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negatedTotal" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities" xlink:label="loc_NetCashProvidedByUsedInFinancingActivities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:to="loc_NetCashProvidedByUsedInFinancingActivities" order="160" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease" xlink:label="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_CashAndCashEquivalentsPeriodIncreaseDecrease" order="18.75" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents" xlink:label="loc_EffectOfExchangeRateOnCashAndCashEquivalents" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_EffectOfExchangeRateOnCashAndCashEquivalents" order="19.375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_CashAndCashEquivalentsAtCarryingValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_CashAndCashEquivalentsAtCarryingValue" order="19.6875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue" xlink:label="loc_CashAndCashEquivalentsAtCarryingValue_1" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_CashAndCashEquivalentsAtCarryingValue_1" order="19.84375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract" xlink:label="loc_SupplementalCashFlowInformationAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="loc_SupplementalCashFlowInformationAbstract" order="19.921875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CashPaidDuringYearForAbstract" xlink:label="biib_CashPaidDuringYearForAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_SupplementalCashFlowInformationAbstract" xlink:to="biib_CashPaidDuringYearForAbstract" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InterestPaidNet" xlink:label="loc_InterestPaidNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_CashPaidDuringYearForAbstract" xlink:to="loc_InterestPaidNet" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxesPaidNet" xlink:label="loc_IncomeTaxesPaidNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_CashPaidDuringYearForAbstract" xlink:to="loc_IncomeTaxesPaidNet" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_NonCashFinancingActivityAbstract" xlink:label="biib_NonCashFinancingActivityAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfCashFlowsAbstract" xlink:to="biib_NonCashFinancingActivityAbstract" order="19.9609375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ConversionOfSubordinatedNotesToCommonAndTreasuryStock" xlink:label="biib_ConversionOfSubordinatedNotesToCommonAndTreasuryStock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_NonCashFinancingActivityAbstract" xlink:to="biib_ConversionOfSubordinatedNotesToCommonAndTreasuryStock" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/DocumentAndEntityInformation" xlink:title="00 - Document - Document and Company Information">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_DocumentAndCompanyInformationAbstract" xlink:label="biib_DocumentAndCompanyInformationAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityRegistrantName" xlink:label="loc_EntityRegistrantName" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityRegistrantName" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityCentralIndexKey" xlink:label="loc_EntityCentralIndexKey" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityCentralIndexKey" order="40" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_DocumentType" xlink:label="loc_DocumentType" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_DocumentType" order="60" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_AmendmentFlag" xlink:label="loc_AmendmentFlag" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_AmendmentFlag" order="100" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_CurrentFiscalYearEndDate" xlink:label="loc_CurrentFiscalYearEndDate" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_CurrentFiscalYearEndDate" order="120" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityWellKnownSeasonedIssuer" xlink:label="loc_EntityWellKnownSeasonedIssuer" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityWellKnownSeasonedIssuer" order="140" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityVoluntaryFilers" xlink:label="loc_EntityVoluntaryFilers" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityVoluntaryFilers" order="160" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityCurrentReportingStatus" xlink:label="loc_EntityCurrentReportingStatus" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityCurrentReportingStatus" order="180" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityFilerCategory" xlink:label="loc_EntityFilerCategory" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityFilerCategory" order="200" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityPublicFloat" xlink:label="loc_EntityPublicFloat" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityPublicFloat" order="220" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_EntityCommonStockSharesOutstanding" xlink:label="loc_EntityCommonStockSharesOutstanding" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_EntityCommonStockSharesOutstanding" order="240" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/non-gaap/dei-2009-01-31.xsd#dei_DocumentPeriodEndDate" xlink:label="loc_DocumentPeriodEndDate" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_DocumentAndCompanyInformationAbstract" xlink:to="loc_DocumentPeriodEndDate" order="70" use="optional" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Inventory" xlink:title="0604 - Disclosure - Inventory">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InventoryNetAbstract" xlink:label="loc_InventoryNetAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_InventoryDisclosureTextBlock" xlink:label="loc_InventoryDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_InventoryNetAbstract" xlink:to="loc_InventoryDisclosureTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/EarningsPerShare" xlink:title="0611 - Disclosure - Earnings per Share">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_EarningsPerShareAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareTextBlock" xlink:label="loc_EarningsPerShareTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EarningsPerShareAbstract" xlink:to="loc_EarningsPerShareTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/ShareBasedPayments" xlink:title="0612 - Disclosure - Share-based Payments">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ShareBasedCompensationAbstract" xlink:label="loc_ShareBasedCompensationAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" xlink:label="loc_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ShareBasedCompensationAbstract" xlink:to="loc_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Collaborations" xlink:title="0617 - Disclosure - Collaborations">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CollaborationsAbstract" xlink:label="biib_CollaborationsAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CollaborativeArrangementDisclosureTextBlock" xlink:label="loc_CollaborativeArrangementDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_CollaborationsAbstract" xlink:to="loc_CollaborativeArrangementDisclosureTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Litigation" xlink:title="0619 - Disclosure - Litigation">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_LitigationAbstract" xlink:label="biib_LitigationAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_LitigationTextBlock" xlink:label="biib_LitigationTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_LitigationAbstract" xlink:to="biib_LitigationTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/SegmentInformation" xlink:title="0620 - Disclosure - Segment Information">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_SegmentInformationAbstract" xlink:label="biib_SegmentInformationAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock" xlink:label="loc_SegmentReportingDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_SegmentInformationAbstract" xlink:to="loc_SegmentReportingDisclosureTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/StatementsOfIncome" xlink:title="01 - Statement - Consolidated Statements of Income">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeStatementAbstract" xlink:label="loc_IncomeStatementAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RevenuesAbstract" xlink:label="loc_RevenuesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_RevenuesAbstract" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SalesRevenueGoodsNet" xlink:label="loc_SalesRevenueGoodsNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_RevenuesAbstract" xlink:to="loc_SalesRevenueGoodsNet" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_UnconsolidatedJointBusiness" xlink:label="biib_UnconsolidatedJointBusiness_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_RevenuesAbstract" xlink:to="biib_UnconsolidatedJointBusiness_2" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/label" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherSalesRevenueNet" xlink:label="loc_OtherSalesRevenueNet" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_RevenuesAbstract" xlink:to="loc_OtherSalesRevenueNet" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_Revenues" xlink:label="loc_Revenues" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_RevenuesAbstract" xlink:to="loc_Revenues" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CostsAndExpensesAbstract" xlink:label="loc_CostsAndExpensesAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_CostsAndExpensesAbstract" order="15" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CostOfRevenue" xlink:label="loc_CostOfRevenue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_CostOfRevenue" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ResearchAndDevelopmentExpense" xlink:label="loc_ResearchAndDevelopmentExpense" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_ResearchAndDevelopmentExpense" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SellingGeneralAndAdministrativeExpense" xlink:label="loc_SellingGeneralAndAdministrativeExpense" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_SellingGeneralAndAdministrativeExpense" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CollaborationProfitSharing" xlink:label="biib_CollaborationProfitSharing" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="biib_CollaborationProfitSharing" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_AmortizationOfIntangibleAssets" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_AmortizationOfIntangibleAssets" order="100" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_AcquiredInProcessResearchAndDevelopment" xlink:label="biib_AcquiredInProcessResearchAndDevelopment" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="biib_AcquiredInProcessResearchAndDevelopment" order="110" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GainsLossesOnSalesOfAssets" xlink:label="loc_GainsLossesOnSalesOfAssets" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_GainsLossesOnSalesOfAssets" order="120" use="optional" preferredLabel="http://xbrl.us/us-gaap/role/label/negatedTotal" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CostsAndExpenses" xlink:label="loc_CostsAndExpenses" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_CostsAndExpensesAbstract" xlink:to="loc_CostsAndExpenses" order="140" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_OperatingIncomeLoss" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_OperatingIncomeLoss" order="17.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense" xlink:label="loc_OtherNonoperatingIncomeExpense" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_OtherNonoperatingIncomeExpense" order="18.75" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" xlink:label="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments" order="19.375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit" xlink:label="loc_IncomeTaxExpenseBenefit" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_IncomeTaxExpenseBenefit" order="19.6875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_ProfitLoss" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_ProfitLoss" order="19.84375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest" xlink:label="loc_NetIncomeLossAttributableToNoncontrollingInterest" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_NetIncomeLossAttributableToNoncontrollingInterest" order="19.921875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_NetIncomeLoss" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_NetIncomeLoss" order="19.9609375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareAbstract" xlink:label="loc_EarningsPerShareAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_EarningsPerShareAbstract" order="19.98046875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_EarningsPerShareBasic" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EarningsPerShareAbstract" xlink:to="loc_EarningsPerShareBasic" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_EarningsPerShareDiluted" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EarningsPerShareAbstract" xlink:to="loc_EarningsPerShareDiluted" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SharesUsedInComputationOfEarningsLossPerShareAbstract" xlink:label="loc_SharesUsedInComputationOfEarningsLossPerShareAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_IncomeStatementAbstract" xlink:to="loc_SharesUsedInComputationOfEarningsLossPerShareAbstract" order="19.990234375" use="optional" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_WeightedAverageNumberOfSharesOutstandingBasic" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_SharesUsedInComputationOfEarningsLossPerShareAbstract" xlink:to="loc_WeightedAverageNumberOfSharesOutstandingBasic" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_WeightedAverageNumberOfDilutedSharesOutstanding" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_SharesUsedInComputationOfEarningsLossPerShareAbstract" xlink:to="loc_WeightedAverageNumberOfDilutedSharesOutstanding" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/ShareholdersEquity" xlink:title="04 - Statement - Consolidated Statements of Shareholders' Equity">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_StatementOfStockholdersEquityAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfStockholdersEquityAbstract" xlink:to="loc_StatementTable" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_StatementEquityComponentsAxis" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementEquityComponentsAxis" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_EquityComponentDomain" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementEquityComponentsAxis" xlink:to="loc_EquityComponentDomain" order="2" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_ParentMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EquityComponentDomain" xlink:to="loc_ParentMember" order="1" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_CommonStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_CommonStockMember" order="2" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_PreferredStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_PreferredStockMember" order="3" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_AdditionalPaidInCapitalMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_AdditionalPaidInCapitalMember" order="7" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_TreasuryStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_TreasuryStockMember" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_RetainedEarningsMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_RetainedEarningsMember" order="11" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_AccumulatedOtherComprehensiveIncomeMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_AccumulatedOtherComprehensiveIncomeMember" order="17" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_NoncontrollingInterestMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EquityComponentDomain" xlink:to="loc_NoncontrollingInterestMember" order="22" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementLineItems" order="5" use="optional" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_TreasuryStockReclassification" xlink:label="biib_TreasuryStockReclassification" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_TreasuryStockReclassification" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CumulativeEffectOfInitialAdoptionOfFIN48" xlink:label="loc_CumulativeEffectOfInitialAdoptionOfFIN48" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_CumulativeEffectOfInitialAdoptionOfFIN48" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense" xlink:label="loc_AllocatedShareBasedCompensationExpense" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_AllocatedShareBasedCompensationExpense" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" xlink:label="loc_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeited" order="2.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" xlink:label="loc_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures" order="1.25" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" xlink:label="loc_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodSharesRestrictedStockAwardGross" order="0.625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross" xlink:label="loc_StockIssuedDuringPeriodValueRestrictedStockAwardGross" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodValueRestrictedStockAwardGross" order="0.3125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockUnderStockAwardPlans" xlink:label="biib_IssuanceOfTreasuryStockUnderStockAwardPlans" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockUnderStockAwardPlans" order="0.15625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockUnderStockAwardPlan" xlink:label="biib_IssuanceOfTreasuryStockUnderStockAwardPlan" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockUnderStockAwardPlan" order="0.078125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlans" xlink:label="biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlans" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlans" order="0.0390625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlan" xlink:label="biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlan" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockUnderStockOptionAndStockPurchasePlan" order="0.01953125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayable" xlink:label="biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayable" order="0.0048828125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayableValue" xlink:label="biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayableValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfTreasuryStockFromConversionOfSubordinatedNotesPayableValue" order="0.00244140625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_TreasuryStockReclassificationShares" xlink:label="biib_TreasuryStockReclassificationShares" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_TreasuryStockReclassificationShares" order="40" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" order="0.00030517578125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease" xlink:label="loc_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease" order="5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/totalLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" xlink:label="loc_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax" order="2.5" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" xlink:label="loc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax" order="1.25" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_ProfitLoss" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_ProfitLoss" order="0.625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" order="0.000152587890625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MinorityInterestIncreaseFromStockIssuance" xlink:label="loc_MinorityInterestIncreaseFromStockIssuance" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_MinorityInterestIncreaseFromStockIssuance" order="0.000457763671875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" xlink:label="loc_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders" order="0.0003814697265625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue" xlink:label="loc_StockRepurchasedAndRetiredDuringPeriodValue" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockRepurchasedAndRetiredDuringPeriodValue" order="0.0018310546875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares" xlink:label="loc_StockRepurchasedAndRetiredDuringPeriodShares" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockRepurchasedAndRetiredDuringPeriodShares" order="0.00213623046875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_1" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_SharesIssued_1" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_SharesIssued_1" order="80" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SharesIssued" xlink:label="loc_SharesIssued" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_SharesIssued" order="0.0002288818359375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" xlink:label="loc_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation" order="6.25" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" xlink:label="loc_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax" order="1.5625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_FairValueOfAssetsAndLiabilitiesAcquiredAndAssignedToNoncontrollingInterestThroughInitialConsolidation" xlink:label="biib_FairValueOfAssetsAndLiabilitiesAcquiredAndAssignedToNoncontrollingInterestThroughInitialConsolidation" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_FairValueOfAssetsAndLiabilitiesAcquiredAndAssignedToNoncontrollingInterestThroughInitialConsolidation" order="0.00034332275390625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" xlink:label="loc_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities" order="0.00732421875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlansShares" xlink:label="biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlansShares" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlansShares" order="0.040283203125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlan" xlink:label="biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlan" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_IssuanceOfCommonStockUnderStockOptionAndStockPurchasePlan" order="0.0396728515625" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" xlink:label="loc_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities" order="0.013427734375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod" xlink:label="loc_TreasuryStockValueAcquiredCostMethod" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_TreasuryStockValueAcquiredCostMethod" order="0.0011444091796875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockSharesAcquired" xlink:label="loc_TreasuryStockSharesAcquired" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_TreasuryStockSharesAcquired" order="0.00148773193359375" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_RetirementOfCommonStock" xlink:label="biib_RetirementOfCommonStock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_RetirementOfCommonStock" order="0.001983642578125" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_RetirementOfCommonStockShares" xlink:label="biib_RetirementOfCommonStockShares" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_RetirementOfCommonStockShares" order="0.0023651123046875" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_TreasuryStockReclassifications" xlink:label="biib_TreasuryStockReclassifications" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="biib_TreasuryStockReclassifications" order="45" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/StatementsOfShareholdersEquity" xlink:title="041 - Statement - Consolidated Statements of Shareholders Equity (Parenthetical)">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract" xlink:label="loc_StatementOfStockholdersEquityAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_StatementTable" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementOfStockholdersEquityAbstract" xlink:to="loc_StatementTable" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_StatementEquityComponentsAxis" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementEquityComponentsAxis" order="20" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_EquityComponentDomain" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementEquityComponentsAxis" xlink:to="loc_EquityComponentDomain" order="2" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ParentMember" xlink:label="loc_ParentMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EquityComponentDomain" xlink:to="loc_ParentMember" order="1" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_CommonStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_CommonStockMember" order="2" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PreferredStockMember" xlink:label="loc_PreferredStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_PreferredStockMember" order="3" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_AdditionalPaidInCapitalMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_AdditionalPaidInCapitalMember" order="7" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_TreasuryStockMember" xlink:label="loc_TreasuryStockMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_TreasuryStockMember" order="10" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_RetainedEarningsMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_RetainedEarningsMember" order="11" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_AccumulatedOtherComprehensiveIncomeMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ParentMember" xlink:to="loc_AccumulatedOtherComprehensiveIncomeMember" order="17" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_NoncontrollingInterestMember" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_EquityComponentDomain" xlink:to="loc_NoncontrollingInterestMember" order="22" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_StatementLineItems" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementTable" xlink:to="loc_StatementLineItems" order="5" use="optional" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StatementLineItems" xlink:to="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" xlink:label="loc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax" xlink:label="loc_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax" order="60" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" xlink:label="loc_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:to="loc_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax" order="30" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/CommitmentsAndContingencies" xlink:title="0618 - Disclosure - Commitments and Contingencies">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_CommitmentsAndContingenciesAbstract" xlink:label="biib_CommitmentsAndContingenciesAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock" xlink:label="loc_CommitmentsAndContingenciesDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_CommitmentsAndContingenciesAbstract" xlink:to="loc_CommitmentsAndContingenciesDisclosureTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Guarantees" xlink:title="0621 - Disclosure - Guarantees">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_GuaranteesAbstract" xlink:label="biib_GuaranteesAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfGuaranteeObligationsTextBlock" xlink:label="loc_ScheduleOfGuaranteeObligationsTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_GuaranteesAbstract" xlink:to="loc_ScheduleOfGuaranteeObligationsTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/AcquisitionsAndDispositions" xlink:title="0602 - Disclosure - Acquisitions and Dispositions">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_AcquisitionsAndDispositionsAbstract" xlink:label="biib_AcquisitionsAndDispositionsAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_AcquisitionsAndDispositionsTextBlock" xlink:label="biib_AcquisitionsAndDispositionsTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_AcquisitionsAndDispositionsAbstract" xlink:to="biib_AcquisitionsAndDispositionsTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/AccumulatedOtherComprehensiveIncomeLoss" xlink:title="0613 - Disclosure - Accumulated Other Comprehensive Income (Loss)">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ComprehensiveIncomeNoteAbstract" xlink:label="loc_ComprehensiveIncomeNoteAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ComprehensiveIncomeNoteTextBlock" xlink:label="loc_ComprehensiveIncomeNoteTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_ComprehensiveIncomeNoteAbstract" xlink:to="loc_ComprehensiveIncomeNoteTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/EmployeeBenefitPlans" xlink:title="0615 - Disclosure - Employee Benefit Plans">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract" xlink:label="loc_GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" xlink:label="loc_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_GeneralDiscussionOfPensionAndOtherPostretirementBenefitsAbstract" xlink:to="loc_PensionAndOtherPostretirementBenefitsDisclosureTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/QuarterlyFinancialData" xlink:title="0622 - Disclosure - Quarterly Financial Data (Unaudited)">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_QuarterlyFinancialDataAbstract" xlink:label="loc_QuarterlyFinancialDataAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_QuarterlyFinancialInformationTextBlock" xlink:label="loc_QuarterlyFinancialInformationTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_QuarterlyFinancialDataAbstract" xlink:to="loc_QuarterlyFinancialInformationTextBlock" order="20" use="optional" priority="1" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/SummaryOfSignificantAccountingPolicies" xlink:title="0601 - Disclosure - Summary of Significant Accounting Policies">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GeneralPoliciesAbstract" xlink:label="loc_GeneralPoliciesAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock" xlink:label="loc_SignificantAccountingPoliciesTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_GeneralPoliciesAbstract" xlink:to="loc_SignificantAccountingPoliciesTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/OtherConsolidatedFinancialStatementDetail" xlink:title="0614 - Disclosure - Other Consolidated Financial Statement Detail">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_OtherConsolidatedFinancialStatementDetailAbstract" xlink:label="biib_OtherConsolidatedFinancialStatementDetailAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_OtherConsolidatedFinancialStatementDetailTextBlock" xlink:label="biib_OtherConsolidatedFinancialStatementDetailTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_OtherConsolidatedFinancialStatementDetailAbstract" xlink:to="biib_OtherConsolidatedFinancialStatementDetailTextBlock" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/NewAccountingPronouncements" xlink:title="0623 - Disclosure - New Accounting Pronouncements">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:label="loc_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" xlink:label="loc_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract" xlink:to="loc_ScheduleOfNewAccountingPronouncementsAndChangesInAccountingPrinciplesTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/DerivativeInstruments" xlink:title="0608 - Disclosure - Derivative Instruments">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgesAbstract" xlink:label="loc_DerivativeInstrumentsAndHedgesAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_DerivativeInstrumentsTextBlock" xlink:label="biib_DerivativeInstrumentsTextBlock_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_DerivativeInstrumentsAndHedgesAbstract" xlink:to="biib_DerivativeInstrumentsTextBlock_2" order="10" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/FinancialInstruments" xlink:title="0607 - Disclosure - Financial Instruments">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_FinancialInstrumentsAbstract" xlink:label="biib_FinancialInstrumentsAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_FinancialInstrumentsTextBlock" xlink:label="biib_FinancialInstrumentsTextBlock_2" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_FinancialInstrumentsAbstract" xlink:to="biib_FinancialInstrumentsTextBlock_2" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/FairValueMeasurements" xlink:title="0606 - Disclosure - Fair Value Measurements">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_FairValueMeasurementsAbstract" xlink:label="biib_FairValueMeasurementsAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock" xlink:label="loc_FairValueDisclosuresTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_FairValueMeasurementsAbstract" xlink:to="loc_FairValueDisclosuresTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/IntangibleAssetsAndGoodwill" xlink:title="0605 - Disclosure - Intangible Assets and Goodwill">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IntangibleAssetsAndGoodwillAbstract" xlink:label="biib_IntangibleAssetsAndGoodwillAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock" xlink:label="loc_GoodwillAndIntangibleAssetsDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_IntangibleAssetsAndGoodwillAbstract" xlink:to="loc_GoodwillAndIntangibleAssetsDisclosureTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Reserves" xlink:title="0603 - Disclosure - Reserves">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ReservesAbstract" xlink:label="biib_ReservesAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ReservesTextBlock" xlink:label="biib_ReservesTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_ReservesAbstract" xlink:to="biib_ReservesTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Indebtedness" xlink:title="0609 - Disclosure - Indebteness">
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_IndebtednessAbstract" xlink:label="biib_IndebtednessAbstract" />
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_DebtDisclosureTextBlock" xlink:label="loc_DebtDisclosureTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="biib_IndebtednessAbstract" xlink:to="loc_DebtDisclosureTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
  <presentationLink xlink:type="extended" xlink:role="http://biogenidec.com/role/Equity" xlink:title="0610 - Disclosure - Shareholders' Equity">
    <loc xlink:type="locator" xlink:href="http://taxonomies.xbrl.us/us-gaap/2009/elts/us-gaap-2009-01-31.xsd#us-gaap_StockholdersEquityNoteAbstract" xlink:label="loc_StockholdersEquityNoteAbstract" />
    <loc xlink:type="locator" xlink:href="biib-20091231.xsd#biib_ShareholdersEquityTextBlock" xlink:label="biib_ShareholdersEquityTextBlock" />
    <presentationArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_StockholdersEquityNoteAbstract" xlink:to="biib_ShareholdersEquityTextBlock" order="20" use="optional" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel" priority="1" />
  </presentationLink>
</linkbase>
</XBRL>
