Exhibit 23

Consent of Independent Registered Public Accounting Firm

Telos Corporation

19886 Ashburn Road

Ashburn, Virginia 20147

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-252400) of Telos Corporation of our report dated March 25, 2021, relating to the consolidated financial statements, which appears in this Form 10-K.

/s/ BDO USA, LLP

McLean, Virginia

March 25, 2021