Exhibit 23(a)

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Form S-3 (No. 333-221338) and on Forms S-8 (No. 333-55346, No. 333-82422, No. 333-164441, No. 333-192673, No. 333-198455, No. 333-204282, No. 333-234238, No. 333-235366, No. 333-235365 and No. 333-235364) of ViacomCBS Inc. of our report dated February 20, 2020 relating to the financial statements and financial statement schedule and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PRICEWATERHOUSECOOPERS LLP

New York, New York

February 20, 2020