A42.6 Consent when our report(s) on audited financial statements and the effectiveness of internal control over financial reporting included in a Form 10-K are incorporated by reference in a previously filed and effective registration statement (for fiscal years ending on or after December 15, 2017)

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (Nos. 333-174814, 333-218222, 333-265374 and 333-279519) on Forms S-8 and the registration statement (No. 333-279527) on Form S-3 of our reports dated March 5, 2025, with respect to the consolidated financial statements of Orion Group Holdings, Inc. and the effectiveness of internal control over financial reporting.

/s/ KPMG LLP

Houston, Texas
March 5, 2025