Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Harmonic Inc. Amended and Restated 2002 Employee Stock Purchase Plan and the Harmonic Inc. Amended and Restated 1995 Stock Plan of our reports dated February 28, 2022, with respect to the consolidated financial statements of Harmonic Inc. and the effectiveness of internal control over financial reporting of Harmonic Inc. included in the Annual Report (Form 10-K) for the year ended December 31, 2021, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

San Jose, California

August 19, 2022