<?xml version="1.0" encoding="US-ASCII"?>
<!-- RR Donnelley Xcelerate Taxonomy Schema, based on XBRL 2.1  http://www.rrdonnelley.com/ -->
<!-- Version: 6.20.1 -->
<!-- Round: 4 -->
<!-- Creation date: 2012-11-05T21:49:59Z -->
<!-- Copyright (c) 2005-2012 R.R. Donnelley &amp; Sons Company All Rights Reserved. -->
<schema xmlns="http://www.w3.org/2001/XMLSchema"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:us-gaap="http://fasb.org/us-gaap/2012-01-31"
  xmlns:us-types="http://fasb.org/us-types/2012-01-31"
  xmlns:qnst="http://www.quinstreet.com/20120930"
  xmlns:nonnum="http://www.xbrl.org/dtr/type/non-numeric"
  xmlns:num="http://www.xbrl.org/dtr/type/numeric"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xmlns:country="http://xbrl.sec.gov/country/2012-01-31"
  xmlns:dei="http://xbrl.sec.gov/dei/2012-01-31"
  xmlns:invest="http://xbrl.sec.gov/invest/2012-01-31"
  targetNamespace="http://www.quinstreet.com/20120930"
  elementFormDefault="qualified" attributeFormDefault="unqualified">
  <annotation>
    <appinfo>
      <link:roleType roleURI="http://www.quinstreet.com/taxonomy/role/DocumentDocumentandEntityInformation" id="DocumentDocumentandEntityInformation">
        <link:definition>101 - 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.quinstreet.com/taxonomy/role/StatementOfFinancialPositionClassified" id="Role_StatementOfFinancialPositionClassified">
        <link:definition>103 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS</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.quinstreet.com/taxonomy/role/StatementOfFinancialPositionClassifiedParenthetical" id="Role_StatementOfFinancialPositionClassifiedParen">
        <link:definition>104 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (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.quinstreet.com/taxonomy/role/StatementOfIncome" id="Role_StatementOfIncome">
        <link:definition>105 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS</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.quinstreet.com/taxonomy/role/StatementOfIncomeParenthetical" id="Role_StatementOfIncomeParen">
        <link:definition>106 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (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.quinstreet.com/taxonomy/role/StatementOfOtherComprehensiveIncome" id="Role_StatementOfOtherComprehensiveIncome">
        <link:definition>107 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME</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.quinstreet.com/taxonomy/role/StatementOfCashFlowsIndirect" id="Role_StatementOfCashFlowsIndirect">
        <link:definition>108 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock" id="Role_NotesToFinancialStatementsOrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock">
        <link:definition>109 - Disclosure - The Company</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlock" id="Role_NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlock">
        <link:definition>110 - Disclosure - Summary of 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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlock" id="Role_NotesToFinancialStatementsEarningsPerShareTextBlock">
        <link:definition>111 - Disclosure - Net (Loss) Income Attributable to Common Stockholders and Net (Loss) Income per Share</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsFairValueMeasurementsAndMarketableSecuritiesTextBlock" id="Role_NotesToFinancialStatementsFairValueMeasurementsAndMarketableSecuritiesTextBlock">
        <link:definition>112 - Disclosure - Fair Value Measurements and Marketable Securities</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock" id="Role_NotesToFinancialStatementsBusinessCombinationDisclosureTextBlock">
        <link:definition>113 - Disclosure - Acquisitions</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock" id="Role_NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlock">
        <link:definition>114 - Disclosure - Intangible Assets, Net and Goodwill</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlock" id="Role_NotesToFinancialStatementsDebtDisclosureTextBlock">
        <link:definition>115 - Disclosure - Debt</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock" id="Role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlock">
        <link:definition>116 - Disclosure - Commitments and Contingencies</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock" id="Role_NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock">
        <link:definition>117 - Disclosure - Stock Benefit Plans</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock" id="Role_NotesToFinancialStatementsStockholdersEquityNoteDisclosureTextBlock">
        <link:definition>118 - Disclosure - Stockholders' Equity</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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlock" id="Role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlock">
        <link:definition>119 - Disclosure - Segment 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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlockPolicies" id="Role_NotesToFinancialStatementsBasisOfPresentationAndSignificantAccountingPoliciesTextBlockPolicies">
        <link:definition>120 - Disclosure - Summary of 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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsEarningsPerShareTextBlockTables" id="Role_NotesToFinancialStatementsEarningsPerShareTextBlockTables">
        <link:definition>121 - Disclosure - Net (Loss) Income Attributable to Common Stockholders and Net (Loss) Income per Share (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsFairValueMeasurementsAndMarketableSecuritiesTextBlockTables" id="Role_NotesToFinancialStatementsFairValueMeasurementsAndMarketableSecuritiesTextBlockTables">
        <link:definition>122 - Disclosure - Fair Value Measurements and Marketable Securities (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsBusinessCombinationDisclosureTextBlockTables">
        <link:definition>123 - Disclosure - Acquisitions (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsGoodwillAndIntangibleAssetsDisclosureTextBlockTables">
        <link:definition>124 - Disclosure - Intangible Assets, Net and Goodwill (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsDebtDisclosureTextBlockTables">
        <link:definition>125 - Disclosure - Debt (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsCommitmentsAndContingenciesDisclosureTextBlockTables">
        <link:definition>126 - Disclosure - Commitments and Contingencies (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables" id="Role_NotesToFinancialStatementsDisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlockTables">
        <link:definition>127 - Disclosure - Stock Benefit Plans (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.quinstreet.com/taxonomy/role/NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables" id="Role_NotesToFinancialStatementsSegmentReportingDisclosureTextBlockTables">
        <link:definition>128 - Disclosure - Segment Information (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.quinstreet.com/taxonomy/role/DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation" id="DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformation">
        <link:definition>129 - Disclosure - Summary of 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.quinstreet.com/taxonomy/role/DisclosureNetLossIncomeAttributableToCommonStockholdersAndNetLossIncomePerShareCalculationOfBasicAndDilutedNetIncomePerShare" id="DisclosureNetLossIncomeAttributableToCommonStockholdersAndNetLossIncomePerShareCalculationOfBasicAndDilutedNetIncomePerShare">
        <link:definition>130 - Disclosure - Net (Loss) Income Attributable to Common Stockholders and Net (Loss) Income per Share - Calculation of Basic and Diluted Net Income Per Share (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.quinstreet.com/taxonomy/role/DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfFinancialInstrumentHeldByCompany" id="DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfFinancialInstrumentHeldByCompany">
        <link:definition>131 - Disclosure - Fair Value Measurements and Marketable Securities - Schedule of Financial Instrument held by Company (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.quinstreet.com/taxonomy/role/DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfUnrealizedGainsAndLossesRelatedToAvailableForSaleSecurities" id="DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfUnrealizedGainsAndLossesRelatedToAvailableForSaleSecurities">
        <link:definition>132 - Disclosure - Fair Value Measurements and Marketable Securities - Schedule of Unrealized Gains and Losses Related to Available-For-Sale Securities (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.quinstreet.com/taxonomy/role/DisclosureAcquisitionsAdditionalInformation" id="DisclosureAcquisitionsAdditionalInformation">
        <link:definition>133 - Disclosure - Acquisitions - 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.quinstreet.com/taxonomy/role/DisclosureAcquisitionsAggregatePurchasePriceRecorded" id="DisclosureAcquisitionsAggregatePurchasePriceRecorded">
        <link:definition>134 - Disclosure - Acquisitions - Aggregate Purchase Price Recorded (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.quinstreet.com/taxonomy/role/DisclosureAcquisitionsAllocationOfPurchasePriceAndEstimatedUsefulLivesOfAssetsAcquired" id="DisclosureAcquisitionsAllocationOfPurchasePriceAndEstimatedUsefulLivesOfAssetsAcquired">
        <link:definition>135 - Disclosure - Acquisitions - Allocation of Purchase Price and Estimated Useful Lives of Assets Acquired (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.quinstreet.com/taxonomy/role/DisclosureAcquisitionsScheduleOfProFormaFinancialInformation" id="DisclosureAcquisitionsScheduleOfProFormaFinancialInformation">
        <link:definition>136 - Disclosure - Acquisitions - Schedule of Pro Forma Financial 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.quinstreet.com/taxonomy/role/DisclosureIntangibleAssetsNetAndGoodwillIntangibleAssets" id="DisclosureIntangibleAssetsNetAndGoodwillIntangibleAssets">
        <link:definition>137 - Disclosure - Intangible Assets, Net and Goodwill - Intangible Assets (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.quinstreet.com/taxonomy/role/DisclosureIntangiblesAssetsNetAndGoodwillAdditionalInformation" id="DisclosureIntangiblesAssetsNetAndGoodwillAdditionalInformation">
        <link:definition>138 - Disclosure - Intangibles Assets, Net and Goodwill - 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.quinstreet.com/taxonomy/role/DisclosureIntangibleAssetsNetAndGoodwillAmortizationExpense" id="DisclosureIntangibleAssetsNetAndGoodwillAmortizationExpense">
        <link:definition>139 - Disclosure - Intangible Assets, Net and Goodwill - Amortization 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.quinstreet.com/taxonomy/role/DisclosureIntangibleAssetsNetAndGoodwillChangeInCarryingAmountOfGoodwill" id="DisclosureIntangibleAssetsNetAndGoodwillChangeInCarryingAmountOfGoodwill">
        <link:definition>140 - Disclosure - Intangible Assets, Net and Goodwill - Change in the Carrying Amount of Goodwill (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.quinstreet.com/taxonomy/role/DisclosureDebtAdditionalInformation" id="DisclosureDebtAdditionalInformation">
        <link:definition>141 - Disclosure - Debt - 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.quinstreet.com/taxonomy/role/DisclosureDebtMaturitiesOfDebt" id="DisclosureDebtMaturitiesOfDebt">
        <link:definition>142 - Disclosure - Debt - Maturities of Debt (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.quinstreet.com/taxonomy/role/DisclosureCommitmentsAndContingenciesAdditionalInformation" id="DisclosureCommitmentsAndContingenciesAdditionalInformation">
        <link:definition>143 - Disclosure - Commitments and Contingencies - 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.quinstreet.com/taxonomy/role/DisclosureCommitmentsAndContingenciesScheduleOfFutureAnnualMinimumLeasePaymentsUnderNoncancelableOperatingLeases" id="DisclosureCommitmentsAndContingenciesScheduleOfFutureAnnualMinimumLeasePaymentsUnderNoncancelableOperatingLeases">
        <link:definition>144 - Disclosure - Commitments and Contingencies - Schedule of Future Annual Minimum Lease Payments under Noncancelable Operating Leases (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.quinstreet.com/taxonomy/role/DisclosureStockBenefitPlansAdditionalInformation" id="DisclosureStockBenefitPlansAdditionalInformation">
        <link:definition>145 - Disclosure - Stock Benefit Plans - 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.quinstreet.com/taxonomy/role/DisclosureStockBenefitPlanScheduleOfWeightedAverageBlackScholesModelAssumptionsAndWeightedAverageGrantDateFairValueOfEmployeeStockOptions" id="DisclosureStockBenefitPlanScheduleOfWeightedAverageBlackScholesModelAssumptionsAndWeightedAverageGrantDateFairValueOfEmployeeStockOptions">
        <link:definition>146 - Disclosure - Stock Benefit Plan - Schedule of Weighted Average Black-Scholes Model Assumptions and Weighted Average Grant Date Fair Value of Employee Stock Options (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.quinstreet.com/taxonomy/role/DisclosureStockholdersEquityAdditionalInformation" id="DisclosureStockholdersEquityAdditionalInformation">
        <link:definition>147 - Disclosure - Stockholders' Equity - 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.quinstreet.com/taxonomy/role/DisclosureSegmentInformationSummarizedInformationBySegment" id="DisclosureSegmentInformationSummarizedInformationBySegment">
        <link:definition>148 - Disclosure - Segment Information - Summarized Information by Segment (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.quinstreet.com/taxonomy/role/DisclosureSegmentInformationNetRevenueAndLongLivedAssetsByGeographicArea" id="DisclosureSegmentInformationNetRevenueAndLongLivedAssetsByGeographicArea">
        <link:definition>149 - Disclosure - Segment Information - Net Revenue and Long-Lived Assets by Geographic Area (Detail)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:href="qnst-20120930_cal.xml" xlink:title="Calculation Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:href="qnst-20120930_def.xml" xlink:title="Definition Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:href="qnst-20120930_lab.xml" xlink:title="Label Links, all"/>
      <link:linkbaseRef xlink:type="simple" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:href="qnst-20120930_pre.xml" xlink:title="Presentation Links, all"/>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <import namespace="http://fasb.org/us-types/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-types-2012-01-31.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/numeric" schemaLocation="http://www.xbrl.org/dtr/type/numeric-2009-12-16.xsd"/>
  <import namespace="http://www.xbrl.org/dtr/type/non-numeric" schemaLocation="http://www.xbrl.org/dtr/type/nonNumeric-2009-12-16.xsd"/>
  <import namespace="http://fasb.org/us-gaap/2012-01-31" schemaLocation="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/country/2012-01-31" schemaLocation="http://xbrl.sec.gov/country/2012/country-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/dei/2012-01-31" schemaLocation="http://xbrl.sec.gov/dei/2012/dei-2012-01-31.xsd"/>
  <import namespace="http://xbrl.sec.gov/invest/2012-01-31" schemaLocation="http://xbrl.sec.gov/invest/2012/invest-2012-01-31.xsd"/>
  <element name="AccretionRecordedAsInterestExpense" id="qnst_AccretionRecordedAsInterestExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AcquiredTechnologyAndOthersMember" id="qnst_AcquiredTechnologyAndOthersMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AcquiredTechnologyMember" id="qnst_AcquiredTechnologyMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AcquisitionsLineItems" id="qnst_AcquisitionsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="AdvertiserRelationshipsMember" id="qnst_AdvertiserRelationshipsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BasicEarningsAbstract" id="qnst_BasicEarningsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BasicShareAbstract" id="qnst_BasicShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="BusinessAcquisitionEarnOutPaymentsRelatedToPriorPeriodAcquisition" id="qnst_BusinessAcquisitionEarnOutPaymentsRelatedToPriorPeriodAcquisition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentAndContingenciesLineItems" id="qnst_CommitmentAndContingenciesLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="CommitmentAndContingenciesTable" id="qnst_CommitmentAndContingenciesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="CostOfRevenueMember" id="qnst_CostOfRevenueMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentImputedInterest" id="qnst_DebtInstrumentImputedInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DebtInstrumentImputedInterestAndUnamortizedDiscount" id="qnst_DebtInstrumentImputedInterestAndUnamortizedDiscount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DilutedSharesAbstract" id="qnst_DilutedSharesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DirectMarketingServicesMember" id="qnst_DirectMarketingServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DirectorsPlanMember" id="qnst_DirectorsPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DirectSellingServicesMember" id="qnst_DirectSellingServicesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAdditionalInformationAbstract" id="qnst_DisclosureAcquisitionsAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAggregatePurchasePriceRecordedAbstract" id="qnst_DisclosureAcquisitionsAggregatePurchasePriceRecordedAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsAllocationOfPurchasePriceAndEstimatedUsefulLivesOfAssetsAcquiredAbstract" id="qnst_DisclosureAcquisitionsAllocationOfPurchasePriceAndEstimatedUsefulLivesOfAssetsAcquiredAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureAcquisitionsScheduleOfProFormaFinancialInformationAbstract" id="qnst_DisclosureAcquisitionsScheduleOfProFormaFinancialInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" id="qnst_DisclosureCommitmentsAndContingenciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureCommitmentsAndContingenciesScheduleOfFutureAnnualMinimumLeasePaymentsUnderNoncancelableOperatingLeasesAbstract" id="qnst_DisclosureCommitmentsAndContingenciesScheduleOfFutureAnnualMinimumLeasePaymentsUnderNoncancelableOperatingLeasesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtAdditionalInformationAbstract" id="qnst_DisclosureDebtAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureDebtMaturitiesOfDebtAbstract" id="qnst_DisclosureDebtMaturitiesOfDebtAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfFinancialInstrumentHeldByCompanyAbstract" id="qnst_DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfFinancialInstrumentHeldByCompanyAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfUnrealizedGainsAndLossesRelatedToAvailableForSaleSecuritiesAbstract" id="qnst_DisclosureFairValueMeasurementsAndMarketableSecuritiesScheduleOfUnrealizedGainsAndLossesRelatedToAvailableForSaleSecuritiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsNetAndGoodwillAmortizationExpenseAbstract" id="qnst_DisclosureIntangibleAssetsNetAndGoodwillAmortizationExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsNetAndGoodwillChangeInCarryingAmountOfGoodwillAbstract" id="qnst_DisclosureIntangibleAssetsNetAndGoodwillChangeInCarryingAmountOfGoodwillAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangibleAssetsNetAndGoodwillIntangibleAssetsAbstract" id="qnst_DisclosureIntangibleAssetsNetAndGoodwillIntangibleAssetsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureIntangiblesAssetsNetAndGoodwillAdditionalInformationAbstract" id="qnst_DisclosureIntangiblesAssetsNetAndGoodwillAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureNetLossIncomeAttributableToCommonStockholdersAndNetLossIncomePerShareCalculationOfBasicAndDilutedNetIncomePerShareAbstract" id="qnst_DisclosureNetLossIncomeAttributableToCommonStockholdersAndNetLossIncomePerShareCalculationOfBasicAndDilutedNetIncomePerShareAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentInformationNetRevenueAndLongLivedAssetsByGeographicAreaAbstract" id="qnst_DisclosureSegmentInformationNetRevenueAndLongLivedAssetsByGeographicAreaAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSegmentInformationSummarizedInformationBySegmentAbstract" id="qnst_DisclosureSegmentInformationSummarizedInformationBySegmentAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockBenefitPlansAdditionalInformationAbstract" id="qnst_DisclosureStockBenefitPlansAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockBenefitPlanScheduleOfWeightedAverageBlackScholesModelAssumptionsAndWeightedAverageGrantDateFairValueOfEmployeeStockOptionsAbstract" id="qnst_DisclosureStockBenefitPlanScheduleOfWeightedAverageBlackScholesModelAssumptionsAndWeightedAverageGrantDateFairValueOfEmployeeStockOptionsAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureStockholdersEquityAdditionalInformationAbstract" id="qnst_DisclosureStockholdersEquityAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationAbstract" id="qnst_DisclosureSummaryOfSignificantAccountingPoliciesAdditionalInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="DocumentDocumentandEntityInformationAbstract" id="qnst_DocumentDocumentandEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EstimateUsefulLifeOfGoodwill" id="qnst_EstimateUsefulLifeOfGoodwill" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedAmortizationExpenseLineItems" id="qnst_ExpectedAmortizationExpenseLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExpectedAmortizationExpenseTable" id="qnst_ExpectedAmortizationExpenseTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FairValueMeasurementsAndMarketableSecuritiesTextBlock" id="qnst_FairValueMeasurementsAndMarketableSecuritiesTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoodwillAndOtherIntangibleAssetsAcquiredDuringPeriod" id="qnst_GoodwillAndOtherIntangibleAssetsAcquiredDuringPeriod" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncrementalCommonSharesAttributableToRestrictedStockUnits" id="qnst_IncrementalCommonSharesAttributableToRestrictedStockUnits" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncrementalCommonSharesAttributableToStockOptions" id="qnst_IncrementalCommonSharesAttributableToStockOptions" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InterestRateSwap1Member" id="qnst_InterestRateSwap1Member" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ITBEMember" id="qnst_ITBEMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LettersOfCreditForFidelityBonds" id="qnst_LettersOfCreditForFidelityBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LettersOfCreditForOperatingLease" id="qnst_LettersOfCreditForOperatingLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumFundedDebtToAdjustedEbitdaRatio" id="qnst_MaximumFundedDebtToAdjustedEbitdaRatio" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPercentageOfNetAccountsReceivableAccountedByClient" id="qnst_MaximumPercentageOfNetAccountsReceivableAccountedByClient" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumPercentageOfRevenueRepresentedByAnyCustomer" id="qnst_MaximumPercentageOfRevenueRepresentedByAnyCustomer" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinimumFixedChargeCoverageRatio" id="qnst_MinimumFixedChargeCoverageRatio" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MoneyMarketInstrumentsMaturityPeriod" id="qnst_MoneyMarketInstrumentsMaturityPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MunicipalSecuritiesMember" id="qnst_MunicipalSecuritiesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetIncomePerShareAttributableToCommonStockholdersAbstract" id="qnst_NetIncomePerShareAttributableToCommonStockholdersAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NetRevenueAbstract" id="qnst_NetRevenueAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCustomersAccountedForMoreThanTenPercentOfAccountsReceivable" id="qnst_NumberOfCustomersAccountedForMoreThanTenPercentOfAccountsReceivable" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfCustomersRepresentingGreaterThanTenPercentOfNetSalesOrAccountsReceivable" id="qnst_NumberOfCustomersRepresentingGreaterThanTenPercentOfNetSalesOrAccountsReceivable" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" id="qnst_OperatingLeasesFutureMinimumPaymentsDueInFiveYearsAndThereafter" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OutstandingBalanceOfTermLoanAfterAmortization" id="qnst_OutstandingBalanceOfTermLoanAfterAmortization" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsToAcquireBusinessesNetOfCashAcquiredAndNotesPayable" id="qnst_PaymentsToAcquireBusinessesNetOfCashAcquiredAndNotesPayable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageDecreaseInInterestRateMarginsForNewFacilityInComparisonWithPreviousCreditFacility" id="qnst_PercentageDecreaseInInterestRateMarginsForNewFacilityInComparisonWithPreviousCreditFacility" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAmortizationWithPrincipalOfCreditFacilityYearFive" id="qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearFive" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAmortizationWithPrincipalOfCreditFacilityYearFour" id="qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearFour" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAmortizationWithPrincipalOfCreditFacilityYearOne" id="qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearOne" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAmortizationWithPrincipalOfCreditFacilityYearThree" id="qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearThree" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfAmortizationWithPrincipalOfCreditFacilityYearTwo" id="qnst_PercentageOfAmortizationWithPrincipalOfCreditFacilityYearTwo" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfMarginInAdditionToPrimeRate" id="qnst_PercentageOfMarginInAdditionToPrimeRate" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfOutstandingSharesAcquisition" id="qnst_PercentageOfOutstandingSharesAcquisition" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodForCreditFacility" id="qnst_PeriodForCreditFacility" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodOfCancellationOfLetterOfCreditFromAnnualExpirationDate" id="qnst_PeriodOfCancellationOfLetterOfCreditFromAnnualExpirationDate" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrimeRateForTermLoan" id="qnst_PrimeRateForTermLoan" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PromissoryNoteMember" id="qnst_PromissoryNoteMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProvisionForDoubtfulAccountsAndSalesReturns" id="qnst_ProvisionForDoubtfulAccountsAndSalesReturns" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RegisteredUserDatabaseAndOtherMember" id="qnst_RegisteredUserDatabaseAndOtherMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RetirementOfTreasuryStock" id="qnst_RetirementOfTreasuryStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfComputationOfBasicAndDilutedEarningsPerCommonShareLineItems" id="qnst_ScheduleOfComputationOfBasicAndDilutedEarningsPerCommonShareLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfComputationOfBasicAndDilutedEarningsPerCommonShareTable" id="qnst_ScheduleOfComputationOfBasicAndDilutedEarningsPerCommonShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SegmentOperatingIncomeBeforeDepreciationAmortizationAndStockBasedCompensationExpense" id="qnst_SegmentOperatingIncomeBeforeDepreciationAmortizationAndStockBasedCompensationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SegmentReportingDisclosureLineItems" id="qnst_SegmentReportingDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SegmentReportingDisclosureTable" id="qnst_SegmentReportingDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="StockRepurchaseAtWeightedAveragePrice" id="qnst_StockRepurchaseAtWeightedAveragePrice" type="num:perShareItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermLoanMember" id="qnst_TermLoanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandTenIncentivePlanMember" id="qnst_TwoThousandTenIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnauditedInterimFinancialInformationPolicyTextBlock" id="qnst_UnauditedInterimFinancialInformationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UpfrontArrangementFeesIncurredInConnectionWithCreditFacility" id="qnst_UpfrontArrangementFeesIncurredInConnectionWithCreditFacility" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WebsiteTradeDomainNamesMember" id="qnst_WebsiteTradeDomainNamesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAverageEffectOfDilutiveSecuritiesAbstract" id="qnst_WeightedAverageEffectOfDilutiveSecuritiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WithholdingTaxesOnNetSettlementOfRsu" id="qnst_WithholdingTaxesOnNetSettlementOfRsu" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ZiffDavisEnterpriseMember" id="qnst_ZiffDavisEnterpriseMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
