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    <dei:DocumentType contextRef="c-2" id="f-23">497</dei:DocumentType>
    <dei:EntityRegistrantName contextRef="c-2" id="f-24">ETF Opportunities Trust</dei:EntityRegistrantName>
    <dei:EntityCentralIndexKey contextRef="c-2" id="f-25">0001771146</dei:EntityCentralIndexKey>
    <dei:AmendmentFlag contextRef="c-2" id="f-26">false</dei:AmendmentFlag>
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    <oef:SupplementToProspectusTextBlock contextRef="c-1" id="f-2">&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span style="background-color:#ffffff;color:#212529;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;TDAQ Lift ETF (TDAX)&lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span style="background-color:#ffffff;color:#212529;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%"&gt;(the &#x201c;Fund&#x201d;)&lt;/span&gt;&lt;/div&gt;&lt;div&gt;&lt;span style="background-color:#ffffff;color:#212529;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%"&gt;&#160;&lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span style="background-color:#ffffff;color:#212529;font-family:'Calibri',sans-serif;font-size:11pt;font-style:italic;font-weight:400;line-height:120%"&gt;A series of&lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span style="background-color:#ffffff;color:#212529;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%"&gt;ETF Opportunities Trust&lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span&gt;&lt;br/&gt;&lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:center"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;Supplement dated October 9, 2026&lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:center"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;to the Prospectus and Statement of Additional Information ("SAI")&lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:center"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;dated January 5, 2026, &lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:center"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;as supplemented from time to time &lt;/span&gt;&lt;/div&gt;&lt;div style="padding-left:3.77pt;padding-right:3.77pt;text-align:center"&gt;&lt;span&gt;&lt;br/&gt;&lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:center"&gt;&lt;span&gt;&lt;br/&gt;&lt;/span&gt;&lt;/div&gt;&lt;div style="text-align:justify;text-indent:36pt"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%"&gt;This Supplement updates certain information contained in the Prospectus. Please retain this Supplement for future reference.&lt;/span&gt;&lt;/div&gt;</oef:SupplementToProspectusTextBlock>
    <oef:RiskReturnHeading contextRef="c-1" id="f-1">TDAQ Lift ETF</oef:RiskReturnHeading>
    <dei:DocumentPeriodEndDate contextRef="c-2" id="f-3">2026-10-09</dei:DocumentPeriodEndDate>
    <oef:ProspectusDate contextRef="c-2" id="f-4">2026-01-05</oef:ProspectusDate>
    <oef:ExpenseHeading contextRef="c-1" id="f-5">Effective immediately, the section titled &#x201c;Fees and Expenses of the Fund&#x201d; of the summary section of the Fund&#x2019;s Prospectus is hereby deleted in its entirety and replaced with the following information:Fees and Expenses of the Fund</oef:ExpenseHeading>
    <oef:ExpenseNarrativeTextBlock contextRef="c-1" id="f-6">&lt;div style="text-align:justify"&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:400;line-height:120%"&gt;This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. &lt;/span&gt;&lt;span style="color:#000000;font-family:'Calibri',sans-serif;font-size:11pt;font-weight:700;line-height:120%"&gt;You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.&lt;/span&gt;&lt;/div&gt;</oef:ExpenseNarrativeTextBlock>
    <oef:OperatingExpensesCaption contextRef="c-1" id="f-7">Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)</oef:OperatingExpensesCaption>
    <oef:ManagementFeesOverAssets contextRef="c-3" decimals="4" id="f-8" unitRef="number">0.0098</oef:ManagementFeesOverAssets>
    <oef:DistributionAndService12b1FeesOverAssets contextRef="c-3" decimals="4" id="f-9" unitRef="number">0.0000</oef:DistributionAndService12b1FeesOverAssets>
    <oef:OtherExpensesOverAssets contextRef="c-3" decimals="4" id="f-10" unitRef="number">0.0000</oef:OtherExpensesOverAssets>
    <oef:AcquiredFundFeesAndExpensesOverAssets contextRef="c-3" decimals="4" id="f-11" unitRef="number">0.0061</oef:AcquiredFundFeesAndExpensesOverAssets>
    <oef:ExpensesOverAssets contextRef="c-3" decimals="4" id="f-12" unitRef="number">0.0159</oef:ExpensesOverAssets>
    <oef:FeeWaiverOrReimbursementOverAssets contextRef="c-3" decimals="4" id="f-13" unitRef="number">-0.0062</oef:FeeWaiverOrReimbursementOverAssets>
    <oef:NetExpensesOverAssets contextRef="c-3" decimals="4" id="f-14" unitRef="number">0.0097</oef:NetExpensesOverAssets>
    <oef:OtherExpensesNewFundBasedOnEstimates contextRef="c-1" id="f-15">Other Expenses are estimated for the Fund&#x2019;s initial fiscal year.</oef:OtherExpensesNewFundBasedOnEstimates>
    <oef:AcquiredFundFeesAndExpensesBasedOnEstimates contextRef="c-1" id="f-16">Based on estimated expenses.</oef:AcquiredFundFeesAndExpensesBasedOnEstimates>
    <oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="c-1" id="f-17">April 30, 2028</oef:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
    <oef:ExpenseExampleHeading contextRef="c-1" id="f-18">Example</oef:ExpenseExampleHeading>
    <oef:ExpenseExampleNarrativeTextBlock contextRef="c-1" id="f-19">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds.  The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods.  The example also assumes that your investment has a five percent (5%) return each year and that the Fund&#x2019;s operating expenses remain the same.  The effect of the Adviser&#x2019;s agreement to waive a portion of its management fee is reflected in the example shown below for the first year.</oef:ExpenseExampleNarrativeTextBlock>
    <oef:ExpenseExampleByYearCaption contextRef="c-1" id="f-20">Although your actual costs may be higher or lower, based on these assumptions your costs would be:</oef:ExpenseExampleByYearCaption>
    <oef:ExpenseExampleYear01 contextRef="c-3" decimals="0" id="f-21" unitRef="usd">99</oef:ExpenseExampleYear01>
    <oef:ExpenseExampleYear03 contextRef="c-3" decimals="0" id="f-22" unitRef="usd">441</oef:ExpenseExampleYear03>
    <link:footnoteLink
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        <link:footnote id="fn-1" xlink:label="fn-1" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:20.12pt">Under the Investment Advisory Agreement, Tapp Finance, Inc., d/b/a TappAlpha (the &#x201c;Adviser&#x201d;), at its own expense and without reimbursement from the Fund, pays all of the expenses of the Fund, excluding the advisory fees, interest expenses, taxes, acquired fund fees and expenses, brokerage commissions and any other portfolio transaction-related expenses and fees arising out of transactions effected on behalf of the Fund, credit facility fees and expenses, including interest expenses, and litigation and indemnification expenses and other extraordinary expenses not incurred in the ordinary course of the Fund&#x2019;s business.</xhtml:span></link:footnote>
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        <link:loc xlink:href="#f-10" xlink:label="f-10" xlink:type="locator"/>
        <link:footnote id="fn-2" xlink:label="fn-2" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:20.12pt">Other Expenses are estimated for the Fund&#x2019;s initial fiscal year.</xhtml:span></link:footnote>
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        <link:loc xlink:href="#f-11" xlink:label="f-11" xlink:type="locator"/>
        <link:footnote id="fn-3" xlink:label="fn-3" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:20.12pt">Based on estimated expenses.</xhtml:span></link:footnote>
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        <link:footnote id="fn-4" xlink:label="fn-4" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:20.12pt">The cost of investing in swaps, including the embedded cost of the swap and the operating expenses of the referenced assets, is an indirect expense that is not included in the above fee table and is not reflected in the expense example. The total indirect cost of investing in swaps, including the embedded cost of the swap and the operating expenses of the referenced assets, is estimated to be 0.244% for the fiscal period ending December 31, 2026.</xhtml:span></link:footnote>
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        <link:footnote id="fn-5" xlink:label="fn-5" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US"><xhtml:span style="color:#000000;font-family:'Calibri',sans-serif;font-size:10pt;font-weight:400;line-height:120%;padding-left:20.12pt">The Adviser has contractually agreed to waive its management fee to an annual rate of 0.36% of the average daily net assets of the Fund until April 30, 2028.  Only the Board can terminate this arrangement prior to that date and any waived fees are not subject to recoupment by the Adviser.</xhtml:span></link:footnote>
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