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

The Board of Directors
Orion Group Holdings, Inc.:

We consent to the incorporation by reference in the registration statements (Nos. 333-174814, 333-218222, and 333-265374) on Forms S-8 of our reports dated March 1, 2024, 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 1, 2024