Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

GSE Systems, Inc.

Sykesville, Maryland

We hereby consent to the incorporation by reference in the Registration Statements on Form S­3 (No. 333-147537 and No. 333-126472) and Form S­8 (No. 333-183427, No. 333-150249 and No. 333-138702) of GSE Systems, Inc. of our report dated March 19, 2015, relating to the consolidated financial statements, which appears in this Form 10-K.

/s/ BDO USA, LLP

Bethesda, Maryland

March 19, 2015