<?xml version="1.0" encoding="us-ascii"?>
<!-- DFS ActiveDisclosure(SM) XBRL Schema Document - http://www.dfsco.com/financial-services/ -->
<!-- Creation Date      : 2017-08-04T20:38:02.0993969+00:00 -->
<!-- Version            : 2.4.8.18 -->
<!-- Package ID         : C8C4C9C3876B89651BA05E9546F090A3-0000921299-001705 -->
<!-- Copyright (c) 2017 Donnelley Financial, LLC. All Rights Reserved. -->
<schema xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric" xmlns:num="http://www.xbrl.org/dtr/type/numeric" xmlns:us-types="http://fasb.org/us-types/2017-01-31" xmlns:stpr="http://xbrl.sec.gov/stpr/2011-01-31" xmlns:naics="http://xbrl.sec.gov/naics/2011-01-31" xmlns:invest="http://xbrl.sec.gov/invest/2013-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:us-gaap="http://fasb.org/us-gaap/2017-01-31" xmlns:dei="http://xbrl.sec.gov/dei/2014-01-31" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:country="http://xbrl.sec.gov/country/2017-01-31" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:currency="http://xbrl.sec.gov/currency/2017-01-31" xmlns:exch="http://xbrl.sec.gov/exch/2017-01-31" xmlns:sic="http://xbrl.sec.gov/sic/2011-01-31" xmlns:fgen="http://www.fibrogen.com/20170630" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.fibrogen.com/20170630" xmlns="http://www.w3.org/2001/XMLSchema">
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/instance" />
  <import schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" namespace="http://www.xbrl.org/2003/linkbase" />
  <import schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" namespace="http://xbrl.org/2005/xbrldt" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd" namespace="http://fasb.org/us-gaap/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/dei/2014/dei-2014-01-31.xsd" namespace="http://xbrl.sec.gov/dei/2014-01-31" />
  <import schemaLocation="http://xbrl.fasb.org/us-gaap/2017/elts/us-types-2017-01-31.xsd" namespace="http://fasb.org/us-types/2017-01-31" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/numeric" />
  <import schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd" namespace="http://www.xbrl.org/dtr/type/non-numeric" />
  <import schemaLocation="http://xbrl.sec.gov/country/2017/country-2017-01-31.xsd" namespace="http://xbrl.sec.gov/country/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/currency/2017/currency-2017-01-31.xsd" namespace="http://xbrl.sec.gov/currency/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/exch/2017/exch-2017-01-31.xsd" namespace="http://xbrl.sec.gov/exch/2017-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd" namespace="http://xbrl.sec.gov/invest/2013-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/naics/2011/naics-2011-01-31.xsd" namespace="http://xbrl.sec.gov/naics/2011-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/sic/2011/sic-2011-01-31.xsd" namespace="http://xbrl.sec.gov/sic/2011-01-31" />
  <import schemaLocation="http://xbrl.sec.gov/stpr/2011/stpr-2011-01-31.xsd" namespace="http://xbrl.sec.gov/stpr/2011-01-31" />
  <annotation>
    <appinfo>
      <link:roleType id="TemplateLink" roleURI="http://www.fibrogen.com/20170630/role/TemplateLink" xmlns:link="http://www.xbrl.org/2003/linkbase">
        <link:definition>00000 - Document - Template Link</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fgen-20170630_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:title="Calculation Links, all" xlink:type="simple" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fgen-20170630_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:title="Definition Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fgen-20170630_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:title="Label Links, all" xlink:type="simple" />
      <link:linkbaseRef xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="fgen-20170630_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:title="Presentation Links, all" xlink:type="simple" />
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DocumentDocumentAndEntityInformation" id="Role_DocumentDocumentAndEntityInformation">
        <link:definition>100000 - Document - Document and Entity Information</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnaudited" id="Role_StatementCondensedConsolidatedBalanceSheetsUnaudited">
        <link:definition>100010 - Statement - Condensed Consolidated Balance Sheets (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical" id="Role_StatementCondensedConsolidatedBalanceSheetsUnauditedParenthetical">
        <link:definition>100020 - Statement - Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsUnaudited" id="Role_StatementCondensedConsolidatedStatementsOfOperationsUnaudited">
        <link:definition>100030 - Statement - Condensed Consolidated Statements of Operations (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedStatementsOfOperationsParentheticalUnaudited" id="Role_StatementCondensedConsolidatedStatementsOfOperationsParentheticalUnaudited">
        <link:definition>100040 - Statement - Condensed Consolidated Statements of Operations (Parenthetical) (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedStatementsOfComprehensiveIncomeLossUnaudited" id="Role_StatementCondensedConsolidatedStatementsOfComprehensiveIncomeLossUnaudited">
        <link:definition>100050 - Statement - Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/StatementCondensedConsolidatedStatementOfCashFlowsUnaudited" id="Role_StatementCondensedConsolidatedStatementOfCashFlowsUnaudited">
        <link:definition>100060 - Statement - Condensed Consolidated Statement of Cash Flows (Unaudited)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureSignificantAccountingPolicies" id="Role_DisclosureSignificantAccountingPolicies">
        <link:definition>100070 - Disclosure - Significant Accounting Policies</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreements" id="Role_DisclosureCollaborationAgreements">
        <link:definition>100080 - Disclosure - Collaboration Agreements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureFairValueMeasurements" id="Role_DisclosureFairValueMeasurements">
        <link:definition>100090 - Disclosure - Fair Value Measurements</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponents" id="Role_DisclosureBalanceSheetComponents">
        <link:definition>100100 - Disclosure - Balance Sheet Components</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureStockBasedCompensation" id="Role_DisclosureStockBasedCompensation">
        <link:definition>100110 - Disclosure - Stock-Based Compensation</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureIncomeTaxes" id="Role_DisclosureIncomeTaxes">
        <link:definition>100120 - Disclosure - Income Taxes</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureRelatedPartyTransactions" id="Role_DisclosureRelatedPartyTransactions">
        <link:definition>100130 - Disclosure - Related Party Transactions</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureSignificantAccountingPoliciesPolicies" id="Role_DisclosureSignificantAccountingPoliciesPolicies">
        <link:definition>100140 - Disclosure - Significant Accounting Policies (Policies)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureSignificantAccountingPoliciesTables" id="Role_DisclosureSignificantAccountingPoliciesTables">
        <link:definition>100150 - Disclosure - Significant Accounting Policies  (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreementsTables" id="Role_DisclosureCollaborationAgreementsTables">
        <link:definition>100160 - Disclosure - Collaboration Agreements (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureFairValueMeasurementsTables" id="Role_DisclosureFairValueMeasurementsTables">
        <link:definition>100170 - Disclosure - Fair Value Measurements (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponentsTables" id="Role_DisclosureBalanceSheetComponentsTables">
        <link:definition>100180 - Disclosure - Balance Sheet Components (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureStockBasedCompensationTables" id="Role_DisclosureStockBasedCompensationTables">
        <link:definition>100190 - Disclosure - Stock-Based Compensation (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureSignificantAccountingPoliciesAdditionalInformationDetail" id="Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetail">
        <link:definition>100200 - Disclosure - Significant Accounting Policies - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureSignificantAccountingPoliciesScheduleOfReconciliationOfBasicAndDilutedNetIncomeLossPerShareCalculationDetail" id="Role_DisclosureSignificantAccountingPoliciesScheduleOfReconciliationOfBasicAndDilutedNetIncomeLossPerShareCalculationDetail">
        <link:definition>100210 - Disclosure - Significant Accounting Policies - Schedule of Reconciliation of Basic and Diluted Net Income (Loss) per Share Calculation (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreementsAstellasAgreementsAdditionalInformationDetail" id="Role_DisclosureCollaborationAgreementsAstellasAgreementsAdditionalInformationDetail">
        <link:definition>100220 - Disclosure - Collaboration Agreements - Astellas Agreements - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreementsAstrazenecaAgreementsAdditionalInformation1Detail" id="Role_DisclosureCollaborationAgreementsAstrazenecaAgreementsAdditionalInformation1Detail">
        <link:definition>100230 - Disclosure - Collaboration Agreements - AstraZeneca Agreements - Additional Information 1 (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreementsSummaryOfRevenueRecognizedUnderAgreementDetail" id="Role_DisclosureCollaborationAgreementsSummaryOfRevenueRecognizedUnderAgreementDetail">
        <link:definition>100240 - Disclosure - Collaboration Agreements - Summary of Revenue Recognized under Agreement (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureCollaborationAgreementsTotalArrangementConsiderationAllocatedToDeliverablesAlongWithAssociatedDeferredRevenueDetail" id="Role_DisclosureCollaborationAgreementsTotalArrangementConsiderationAllocatedToDeliverablesAlongWithAssociatedDeferredRevenueDetail">
        <link:definition>100250 - Disclosure - Collaboration Agreements - Total Arrangement Consideration Allocated to Deliverables along with Associated Deferred Revenue (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureFairValueMeasurementsFairValuesOfFinancialAssetsMeasuredOnRecurringBasisDetail" id="Role_DisclosureFairValueMeasurementsFairValuesOfFinancialAssetsMeasuredOnRecurringBasisDetail">
        <link:definition>100260 - Disclosure - Fair Value Measurements - Fair Values of Financial Assets Measured on Recurring Basis (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureFairValueMeasurementsFairValuesOfFinancialLiabilitiesCarriedAtHistoricalCostDetail" id="Role_DisclosureFairValueMeasurementsFairValuesOfFinancialLiabilitiesCarriedAtHistoricalCostDetail">
        <link:definition>100270 - Disclosure - Fair Value Measurements - Fair Values of Financial Liabilities Carried at Historical Cost (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureFairValueMeasurementsAdditionalInformationDetail" id="Role_DisclosureFairValueMeasurementsAdditionalInformationDetail">
        <link:definition>100280 - Disclosure - Fair Value Measurements - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponentsScheduleOfCashAndCashEquivalentsDetail" id="Role_DisclosureBalanceSheetComponentsScheduleOfCashAndCashEquivalentsDetail">
        <link:definition>100290 - Disclosure - Balance Sheet Components - Schedule of Cash and Cash Equivalents (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponentsAdditionalInformationDetail" id="Role_DisclosureBalanceSheetComponentsAdditionalInformationDetail">
        <link:definition>100300 - Disclosure - Balance Sheet Components - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponentsSummaryOfAmortizedCostGrossUnrealizedHoldingGainsOrLossesAndFairValueOfAvailableForSaleInvestmentsDetail" id="Role_DisclosureBalanceSheetComponentsSummaryOfAmortizedCostGrossUnrealizedHoldingGainsOrLossesAndFairValueOfAvailableForSaleInvestmentsDetail">
        <link:definition>100310 - Disclosure - Balance Sheet Components - Summary of Amortized Cost, Gross Unrealized Holding Gains or Losses, and Fair Value of Available-for-Sale Investments (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureBalanceSheetComponentsScheduleOfAccruedLiabilitiesDetail" id="Role_DisclosureBalanceSheetComponentsScheduleOfAccruedLiabilitiesDetail">
        <link:definition>100320 - Disclosure - Balance Sheet Components - Schedule of Accrued Liabilities (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfAllocatedStockBasedCompensationExpenseDetail" id="Role_DisclosureStockBasedCompensationScheduleOfAllocatedStockBasedCompensationExpenseDetail">
        <link:definition>100330 - Disclosure - Stock-Based Compensation - Schedule of Allocated Stock-Based Compensation Expense (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureStockBasedCompensationScheduleOfAssumptionsUsedToEstimateFairValueOfStockOptionsGrantedAndPurchasesUnder2014EmployeeSharePurchasePlanDetail" id="Role_DisclosureStockBasedCompensationScheduleOfAssumptionsUsedToEstimateFairValueOfStockOptionsGrantedAndPurchasesUnder2014EmployeeSharePurchasePlanDetail">
        <link:definition>100340 - Disclosure - Stock-Based Compensation - Schedule of Assumptions used to Estimate Fair Value of Stock Options Granted and Purchases under 2014 Employee Share Purchase Plan (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType roleURI="http://www.fibrogen.com/20170630/taxonomy/role/DisclosureRelatedPartyTransactionsAdditionalInformationDetail" id="Role_DisclosureRelatedPartyTransactionsAdditionalInformationDetail">
        <link:definition>100350 - Disclosure - Related Party Transactions - Additional Information (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </appinfo>
  </annotation>
  <element id="fgen_CumulativeRevenueLicenseAndCollaborationServicesRevenueRecognized" name="CumulativeRevenueLicenseAndCollaborationServicesRevenueRecognized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_DocumentAndEntityInformationAbstract" name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_RestrictedTimeDepositsNoncurrent" name="RestrictedTimeDepositsNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_LeaseFinancingObligationNoncurrent" name="LeaseFinancingObligationNoncurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_AccruedProductDevelopmentCosts" name="AccruedProductDevelopmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_LicenseFeesAndMilestonesRevenue" name="LicenseFeesAndMilestonesRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_CollaborationServicesAndOtherRevenue" name="CollaborationServicesAndOtherRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_InterestAndOtherNetAbstract" name="InterestAndOtherNetAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_AstellasCollaborationAgreementMember" name="AstellasCollaborationAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_IncreaseDecreaseInLeaseFinancingLiability" name="IncreaseDecreaseInLeaseFinancingLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_ProceedsFromFollowOnOfferingNetOfUnderwritingDiscountsAndCommissionCosts" name="ProceedsFromFollowOnOfferingNetOfUnderwritingDiscountsAndCommissionCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_DescriptionOfOperationsPolicyPolicyTextBlock" name="DescriptionOfOperationsPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_BasisOfPresentationAndPrinciplesOfConsolidationPolicyPolicyTextBlock" name="BasisOfPresentationAndPrinciplesOfConsolidationPolicyPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_RecentlyIssuedAndAdoptedAccountingGuidancePolicyTextBlock" name="RecentlyIssuedAndAdoptedAccountingGuidancePolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_RecentlyIssuedAccountingGuidanceNotYetAdoptedPolicyTextBlock" name="RecentlyIssuedAccountingGuidanceNotYetAdoptedPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_RevenueRecognitionByTypeTableTextBlock" name="RevenueRecognitionByTypeTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_UnitedStatesAndRestOfWorldMember" name="UnitedStatesAndRestOfWorldMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_ScheduleOfShareBasedPaymentAwardStockOptionsAndEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock" name="ScheduleOfShareBasedPaymentAwardStockOptionsAndEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_UnderwritingDiscountsAndCommissions" name="UnderwritingDiscountsAndCommissions" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_OfferingExpenses" name="OfferingExpenses" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_AccountingPolicyLineItems" name="AccountingPolicyLineItems" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_AccountingPolicyTable" name="AccountingPolicyTable" type="xbrli:stringItemType" substitutionGroup="xbrldt:hypercubeItem" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_FollowOnOfferingMember" name="FollowOnOfferingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_DilutiveEffectOfPotentialCommonShares" name="DilutiveEffectOfPotentialCommonShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_ProceedsFromUpfrontNonContingentAndTimeBasedPayments" name="ProceedsFromUpfrontNonContingentAndTimeBasedPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_CommercialSalesMilestone" name="CommercialSalesMilestone" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_AdditionalConsiderationBasedOnNetSales" name="AdditionalConsiderationBasedOnNetSales" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_ClinicalDevelopmentMilestone" name="ClinicalDevelopmentMilestone" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_DevelopmentAndRegulatoryApprovalMilestones" name="DevelopmentAndRegulatoryApprovalMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_PercentageOfFundingForCosts" name="PercentageOfFundingForCosts" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_ExpectedProceedsFromUpfrontNonContingentAndTimeBasedPayments" name="ExpectedProceedsFromUpfrontNonContingentAndTimeBasedPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_DevelopmentMilestonePaymentReceived" name="DevelopmentMilestonePaymentReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_AstraZenecaAgreementsMember" name="AstraZenecaAgreementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_DevelopmentMilestonesMember" name="DevelopmentMilestonesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_FibroGenIncMember" name="FibroGenIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_SharedDevelopmentCosts" name="SharedDevelopmentCosts" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_ProceedsFromUpfrontPayments" name="ProceedsFromUpfrontPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_ContingentPayments" name="ContingentPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="fgen_EstimatedJointDevelopmentServicePeriod" name="EstimatedJointDevelopmentServicePeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_EstimatedJointDevelopmentExtendedServicePeriod" name="EstimatedJointDevelopmentExtendedServicePeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_ChinaSingleUnitOfAccountingMember" name="ChinaSingleUnitOfAccountingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_CashConsiderationReceivedUnderCollaborationAgreement" name="CashConsiderationReceivedUnderCollaborationAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_LicenseMember" name="LicenseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_WhenAndIfAvailableCompoundsMember" name="WhenAndIfAvailableCompoundsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_ManufacturingClinicalSuppliesMember" name="ManufacturingClinicalSuppliesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_CommitteeServicesMember" name="CommitteeServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_DevelopmentServicesInProgressMember" name="DevelopmentServicesInProgressMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_CoDevelopmentInformationSharingAndCommitteeServicesMember" name="CoDevelopmentInformationSharingAndCommitteeServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_BondAndMutualFundsMember" name="BondAndMutualFundsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_LeaseFinancingObligationsMember" name="LeaseFinancingObligationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_AvailableForSaleSecuritiesContractualMaturityPeriod" name="AvailableForSaleSecuritiesContractualMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="fgen_AccruedPreclinicalAndClinicalTrialCurrent" name="AccruedPreclinicalAndClinicalTrialCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="fgen_AstellasMember" name="AstellasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <element id="fgen_GoodwinProcterLLPMember" name="GoodwinProcterLLPMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</schema>
