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CORRESP

 October 4, 2023

VIA EDGAR SUBMISSION

 Securities and Exchange
Commission

 Division of Corporation Finance

 Office of
Manufacturing

 100 F Street, N.E.

 Washington, D.C. 20549

 Attention:  Eiko Yaoita Pyles

Andrew Blume

Re:
 Harmonic Inc.

Form 10-K for the Year Ended December 31, 2022

Form 8-K Furnished July 31, 2023

File No. 000-25826

Ladies and Gentlemen:

 On behalf of Harmonic
Inc. (the “Company”), we are responding to the comments of the staff (the “Staff”) of the Securities and Exchange Commission (the “Commission”) contained in its letter dated August 29, 2023, to
Walter Jankovic, the Company’s Chief Financial Officer, regarding the above referenced Form 10-K filed on February 28, 2023 and the above referenced Form 8-K
furnished on July 31, 2023 (File No. 000-25826).

 In this letter, we have recited the
comments from the Staff in bold and italicized type and have followed each comment with the Company’s response. References to “we,” “our,” or “us” mean the Company or its advisors, as the context may require.

Form 10-K for the fiscal year ended December 31, 2022

Management’s Discussion and Analysis of Financial Condition and Results of Operations Critical Accounting Estimates, page 37

1.
 Please revise the discussion of your critical accounting policies to focus on the assumptions and
uncertainties that underlie your critical accounting estimates. Also quantify, where material, and provide an analysis of the impact of critical accounting estimates on your financial position and results of operations for the periods presented,
including the effects of changes in critical accounting estimates between periods. In addition, include a qualitative and quantitative analysis of the sensitivity of reported results to changes in your assumptions, judgments, and estimates,
including the likelihood of obtaining materially different results if different assumptions were applied. These disclosures should supplement, not duplicate, the accounting policy disclosures included in your financial statement footnotes. Please
refer to SEC Release No. 33-8350.

 Harmonic Inc. 2590
Orchard Pkwy, San Jose, CA 95131 T +1 408 542 2500 F +1 408 542 2511 harmonicinc.com

 Securities and Exchange Commission

October 4, 2023

  Page
 2

 The Company acknowledges the Staff’s comment and in future filings, it will revise the
Critical Accounting Estimates section to focus on the assumptions and uncertainties that underlie the Company’s critical accounting estimates. The Company will, where material, revise its Critical Accounting Estimates section to quantify and
provide an analysis of the impact of critical accounting estimates on its financial position and results of operations for the periods presented, including the effects of changes in critical accounting estimates between periods. If material and
reasonably available, the Company will also include qualitative and quantitative information regarding the sensitivity of reported results to changes in its assumptions, judgments, and estimates for outcomes that are reasonably likely to occur and
would have a material effect.

 Results of Operations, page 39

2.
 Where you describe two or more business reasons that contributed to a material change in a financial
statement line item between periods, please quantify, where possible, the extent to which each factor contributed to the overall change in that line item. In addition, where you identify intermediate causes of changes in your operating results, also
describe the reasons underlying the intermediate causes. As an example, your consolidated and segment revenue discussions on pages 39 and 42 discuss changes attributable to various factors that have not been quantified, such as the reduction in
Appliance sales and the impact of ceasing sales activities in Russia, and/or do not explain in sufficient detail the forces driving such factors, such as the “continued penetration” and “increasing usage” from existing customers.
Ensure your narrative better enables investors to see the company through the eyes of management and provides information about the quality of, and potential variability of, your earnings and cash flows, so that investors can ascertain the
likelihood that past performance is indicative of future performance. See Item 303 of Regulation S-K and SEC Release No. 33-8350.

 The Company acknowledges the Staff’s comment and in future filings, it will quantify where possible each
material factor that contributed to the overall change in line items where two or more factors contributed to a material change in a financial statement line item between periods, including offsetting factors. In addition, where the Company
identifies the intermediate causes of changes in its operating results, it will also describe the reasons underlying those intermediate causes.

 Harmonic Inc. 2590
Orchard Pkwy, San Jose, CA 95131 T +1 408 542 2500 F +1 408 542 2511 harmonicinc.com

 Securities and Exchange Commission

October 4, 2023

  Page
 3

 Report of Independent Registered Public Accounting Firm, page 49

3.
 Please amend your Form 10-K to include an audit report related to
your consolidated statements of operations, comprehensive income, stockholders’ equity and cash flows for the fiscal year ended December 31, 2020, and the related notes.

In response to the Staff’s comment, the Company has filed an amendment to its Form 10-K for the
fiscal year ended December 31, 2022, to include the audit report related to its consolidated statements of operations, comprehensive income, stockholders’ equity, and cash flows for the fiscal year ended December 31, 2020, and the
related notes thereto.

 Consolidated Statements of Operations, page 51

4.
 We note that you separately present revenues and cost of revenues for “Appliance and
integration” and “SaaS and service” on your consolidated statements of operations. Please confirm whether or not these categories represent amounts attributable to products and services pursuant to Rule
5-03(b)(1)-(2) of Regulation S-X. If they do not represent product and service categories, please revise to comply with such guidance or tell us how your current
presentation complies with Rule 5-03.

 The Company acknowledges the
Staff’s comment and assessed the guidance under Rule 5-03(b)(1) of Regulation S-X. In evaluating the presentation of the Company’s statement of
operations and applying the guidance in Rule 5-03(b)(1) and (2) of Regulation S-X, the Company believes the classification of its revenue into
“Appliance and integration” and “SaaS and service” is most useful to its investors because it clearly depicts both the non-recurring and recurring revenue streams. “Appliance and
integration” revenue primarily reflects the non-recurring revenue stream, which includes the revenue from the sale of hardware products and perpetual software licenses, as well as the associated
professional services such as testing, design, installation, commissioning, and integration, collectively referred to as “professional services.” The recognition of revenue from the sale of hardware products and perpetual licenses occurs
at a point in time and accounted for 89%, 93%, and 91% of the Company’s total “Appliance and integration” revenue for the fiscal years ended 2022, 2021, and 2020, respectively. Revenue from professional services as included in the
“Appliance and integration” category, constituted 8%, 5%, and 6% of the Company’s total revenue for the fiscal years ended 2022, 2021, and 2020, respectively. These professional service agreements, associated with the sale of hardware
products and perpetual software licenses, are typically of a short duration, with the vast majority of these contracts not exceeding 3 months, and are considered an important component of the appliance business by management. Given that revenue from
professional services within the “Appliance and integration” category accounted for less than 10% of the Company’s total revenue in the fiscal years ended 2022, 2021, and 2020, and considering its direct association with the appliance
business, the Company has chosen to classify it under “Appliance and integration.” “SaaS and service” revenue reflects the recurring revenue stream, which includes usage fees for the Company’s SaaS platform and support
service revenue from its appliance-based customers and is recognized over time.

 Harmonic Inc. 2590
Orchard Pkwy, San Jose, CA 95131 T +1 408 542 2500 F +1 408 542 2511 harmonicinc.com

 Securities and Exchange Commission

October 4, 2023

  Page
 4

 Under Rule 5-03(b) of Regulation S-X, tangible product revenue and services revenue must be stated separately in the statement of operations if such revenue category represents greater than 10% of total revenues. Accordingly, under
the guidance of Regulation S-X, Rule 5-03(b)(1), “Appliance and integration” revenue, which represented 76%, 73%, and 66% of the Company’s total
revenue in the fiscal years 2022, 2021, and 2020, respectively, has been classified under subcaption (a) –net sales of tangible products, and “SaaS and service” revenue, which represented 24%, 27%, and 34% of the Company’s
total revenue in the fiscal years 2022, 2021, and 2020, respectively, has been classified under subcaption (d) –revenue from services.

Similarly, pursuant to Rule 5-03(b)(2) of Regulation
S-X, the Company separately discloses the cost for each subcaption under Rule 5-03(b)(1).

While the Company acknowledges that professional services associated with the sale of its hardware products and software licenses represent
revenue from services, the Company respectfully submits that Rule 5-03 of Regulation S-X does not prohibit the combination of
professional services revenue with another class of revenue on that basis alone. When considered with the factors above, the Company believes it is more appropriate to include professional services revenue within its “Appliance and
integration” revenue category as opposed to presenting professional services as a standalone revenue category, because professional services revenue is generated if and only to the extent the Company sells hardware products and perpetual
software licenses, and the Company therefore does not manage its professional services as an independent line of business. Furthermore, the Company believes that including these professional services within its “SaaS and services” revenue
category would be inconsistent with the nature of these services, which are characterized by their brief duration and direct association with the Company’s non-recurring revenue stream.

In addition, the Company confirms that it will continue to monitor the level of professional services revenues included in the “Appliance
and integration” category. Should such professional services revenue exceed 10 percent of total revenues in the future, the Company will ensure that appropriate disclosures are made at all times in accordance with Rule 5-03(b) of Regulation S-X.

 Notes to Consolidated Financial Statements

 Note 4: Revenue, page 60

5.
 We note that you recognize revenue related to hardware products, software products, solution sales,
professional services, and support and maintenance services. We further note the description of your various product and service offerings under the “Our Products and Solutions” header on pages 7-8
and that you recognize revenues on both a point in time and over time basis. Pursuant to ASC 606-10-50-5 and ASC 606-10-55-89 through 55-91, please provide disaggregated revenue disclosures that depict how
the

 Harmonic Inc. 2590
Orchard Pkwy, San Jose, CA 95131 T +1 408 542 2500 F +1 408 542 2511 harmonicinc.com

 Securities and Exchange Commission

October 4, 2023

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 5

nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Also tell us the specific revenue categories included in the information regularly
reviewed by your chief operating decision maker. If you believe your current presentation fully complies with ASC 606 disclosure requirements, please advise.

The Company acknowledges the Staff’s comment and respectfully advises the Staff that the objective of its disaggregated revenue
disclosure is to provide the most useful information to users of its financial statements by disclosing the categories of revenue that the Company’s management reviews to manage its business. The Company advises the Staff that this assessment
requires judgment, depends on various entity-specific and industry-specific factors and is not subject to any one prescribed factor as the basis for disaggregation.

The Company has evaluated the guidance in ASC
606-10-50-5 through 50-7 and the related implementation guidance in ASC 606-10-55-89 through 55-91 with respect to the additional disclosures of disaggregated revenues
and has specifically considered the guidance in ASC 606-10-50-5 through 50-7, which
requires an entity to disaggregate revenue from contracts with customers into categories that depict how the nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factors. Further, the Company considered the
examples in ASC 606-10-55-91, which provide additional clarity.

In consideration of the factors in ASC
606-10-55-90, which requires that the Company consider how information about the Company’s revenue has been presented for
other purposes, the Company considered, among other items, disclosures outside the financial statements and information reviewed by its chief operating decision maker. The Company disaggregates its total revenue in two categories on the face of the
statement of operations, “Appliance and integration” and “SaaS and service.” The Company refers to its “Appliance and integration” revenue as a non-recurring revenue stream, which
includes revenue from the sale of hardware products and perpetual software licenses, as well as the associated professional services such as testing, design, installation, commissioning, and integration, collectively referred to as
“professional services.” The recognition of revenue from the sale of hardware products and perpetual licenses occurs at a point in time and accounted for 89%, 93%, and 91% of the Company’s total “Appliance and integration”
revenue for the fiscal years ended 2022, 2021, and 2020, respectively. Revenue from professional services as included in the “Appliance and integration” category, constituted 8%, 5%, and 6% of the Company’s total revenue for the
fiscal years ended 2022, 2021, and 2020, respectively. These professional service agreements, associated with the sale of hardware products and perpetual software licenses, are typically of short duration, with the vast majority of these contracts
not exceeding 3 months, and are considered an important component of the appliance business by the management. The Company refers to its “SaaS and service” revenue as the recurring revenue stream, which includes usage fees for the
Company’s SaaS platform and support service revenue from its appliance-based customers and is recognized over time.

 Harmonic Inc. 2590
Orchard Pkwy, San Jose, CA 95131 T +1 408 542 2500 F +1 408 542 2511 harmonicinc.com

 Securities and Exchange Commission

October 4, 2023

  Page
 6

 Further, as it relates to the examples in ASC 606-10-55-91, in response to the Staff’s comment, the Company specifically considered example ‘f’ within the guidance pertaining to the timing of
transfer of goods or services noting that substantially all of the Company’s “Appliance and integration” revenue is recognized on a point-in-time basis
while all of its “SaaS and service” revenue is recognized over time. This disaggregation of revenue between types provides clarity as to the timing of the transfer of goods or services. The Company also reports total revenue by segment and
geographical region, which is consistent with how its chief operating decision-maker reviews finan