Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 2, 2021, relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in Harmonic Inc.’s Annual Report on Form 10-K for the year ended December 31, 2020.

/s/ Armanino LLP

San Ramon, California

August 20, 2021