Exhibit 23.3

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We have issued our report dated March 10, 2021, with respect to the consolidated financial statements included in the Annual Report of Contango Oil & Gas Company on Form 10-K for the year ended December 31, 2020. We consent to the incorporation by reference of said report in the Registration Statements of Contango Oil & Gas Company on Forms S-3 (File No. 333-238209, File No. 333-235934, File No. 333-239091, File No. 333-250931 and File No. 333-251499), on Forms S-8 (File No. 333-248866, File No. 333-229336, File No. 333-189302 and File No. 333-170236).

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/s/ GRANT THORNTON LLP

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Houston, Texas

March 10, 2021