Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

Telos Corporation

19886 Ashburn Road

Ashburn, Virginia 20147

We hereby consent to the use 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, relating to the consolidated financial statements of Telos Corporation, which is contained in that Prospectus.

We also consent to the reference to us under the caption “Experts” in the Prospectus.

/s/ BDO USA, LLP            

McLean, Virginia

October 6, 2020