Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-226795 and 333-232593) on Form S-3 and registration statements (Nos. 333-227722 and 333-256164) on Form S-8 of our reports dated February 16, 2023, with respect to the consolidated financial statements of Magnolia Oil & Gas Corporation and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Houston, Texas February 16, 2023