Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-144281, 333-155355, 333-159126, 333-166349, 333-172838, 333-179625, 333-186764, 333-194010, 333-202221, 333-209310, and 333-225400 on Form S-8 and Registration Statement Nos. 333-226246 and 333-231778 on Form S-3 of our reports dated February 27, 2020, relating to the financial statements of comScore, Inc. and subsidiaries (the “Company”) and the effectiveness of the Company’s internal control over financial reporting appearing in this Annual Report on Form 10-K for the year ended December 31, 2019.

/s/ Deloitte & Touche LLP

McLean, Virginia  

February 27, 2020