<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>11701 - Disclosure - Revolving Credit Facility</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>Duration_1_1_2013_To_6_30_2013</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001333513</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_DebtDisclosureAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Senior Convertible Notes And Revolving Credit Facility [Abstract]</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>trak_RevolvingCreditFacilityTextBlock</ElementName><ElementPrefix>trak_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><PreferredLabelRole>terseLabel</PreferredLabelRole><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="Duration_1_1_2013_To_6_30_2013" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;div&gt; &lt;div style="margin-left:0pt;margin-right:0pt;"&gt;
		&lt;p style="margin:0pt;font-family:Times New Roman;font-size: 10pt"&gt;
			&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;17&lt;/font&gt;&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;. &amp;nbsp;&lt;/font&gt;&lt;font style="display: inline;font-weight:bold;font-size:10pt;"&gt;Revolving Credit Facility&lt;/font&gt;
		&lt;/p&gt;
		&lt;p style="margin:6pt 0pt 0pt;font-family:Times New Roman;font-size: 10pt"&gt;
			&lt;font style="display: inline;font-size:10pt;"&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp; &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;We have a $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;125.0&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million credit facility which is available for general corporate purposes (including capital expenditures and investments), subject to certain conditions. Our obligations under the credit facility are guaranteed by certain of our existing and future subsidiaries and secured by substantially all of the assets of the company and such subsidiaries. The credit facility matures on March 1, 2017. For further information, see Note 18 included in our Annual Report on Form 10-K for the year ended &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;December 31, 2012&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;.&lt;/font&gt;
		&lt;/p&gt;
		&lt;p style="margin:6pt 0pt 0pt;font-family:Times New Roman;font-size: 10pt"&gt;
			&lt;font style="display: inline;font-size:10pt;"&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;Debt issuance costs associated with the credit facility amortized to interest expense for the three and &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;six&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; months ended &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2013&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; were $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million and $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.2&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million, respectively. Debt issuance costs associated with the credit facility amortized to interest expense for the three and &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;six&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; months ended &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2012&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; were $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million and $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.2&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million, respectively. As of &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2013&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;, there was $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;1.6&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million of debt issuance costs remaining to be amortized to interest expense. Interest expense related to the commitment fee for the three and &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;six&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; months ended &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2013&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; was $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million and $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.2&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million, respectively. Interest expense related to the commitment fee for the three and &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;six&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; months ended &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2012&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; was $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.1&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million and $&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;0.2&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; million, respectively. &lt;/font&gt;
		&lt;/p&gt;
		&lt;p style="margin:6pt 0pt 0pt;font-family:Times New Roman;font-size: 10pt"&gt;
			&lt;font style="display: inline;font-size:10pt;"&gt; &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;As of &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;June 30, 2013&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;, we had &lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt;no&lt;/font&gt;&lt;font style="display: inline;font-size:10pt;"&gt; amounts outstanding under our credit facility and were in compliance with all restrictive covenants and financial ratios.&lt;/font&gt;
		&lt;/p&gt;
		&lt;p&gt;&lt;font size="1"&gt; &lt;/font&gt;&lt;/p&gt;
	&lt;/div&gt; &lt;/div&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>Revolving Credit Facility [Text Block]</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Revolving Credit Facility</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>Revolving Credit Facility</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>true</HasCustomUnits><IsEmbedReport>false</IsEmbedReport><IsMultiCurrency>false</IsMultiCurrency><ReportType>Sheet</ReportType><RoleURI>http://www.dealertrack.com/2010-09-30/role/DisclosureRevolvingCreditFacility</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
