EXHIBIT 23

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on FormS-3(No. 333-197026 and 333-224367) andS-8 (No. 333-86876, 333-99849, 333-120623, 333-125017, 333-130489, 333-145027, 333-145029, 333-159989, 333-167185, 333-167186, 333-167187, 333-181675, 333-183767, 333-183768, and 333-183769) of United Community Banks, Inc. of our report dated February 25, 2021 relating to the financial statementsand the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Atlanta, Georgia

February 25, 2021