Exhibit 23.1

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 Prospectus constituting a part of this Registration Statement of our report dated April 10, 2020, except for the effects of disclosing earnings per share information discussed in Note 1, as to which the date is October 6, 2020, and except for the effects of the stock split discussed in Note 1, as to which the date is November 16, 2020 relating to the consolidated financial statements of Telos Corporation, which is contained in the Company’s Registration Statement on Form S-1 (No. 333-249334).

/s/ BDO USA, LLP

McLean, Virginia

January 25, 2021