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| As filed with the Securities and Exchange Commission on June 28, 2019                                                                                                                                                                                                                                                                                                                                                  |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |   |   |   |   | Registration No. 333 _______ |
| UNITED STATESSECURITIES AND EXCHANGE COMMISSION                                                                                                                                                                                                                                                                                                                                                                        |
| Washington, D.C. 20549                                                                                                                                                                                                                                                                                                                                                                                                 |
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| FORM S-8                                                                                                                                                                                                                                                                                                                                                                                                               |
| REGISTRATION STATEMENT                                                                                                                                                                                                                                                                                                                                                                                                 |
| UnderThe Securities Act of 1933                                                                                                                                                                                                                                                                                                                                                                                        |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| HARMONIC INC.                                                                                                                                                                                                                                                                                                                                                                                                          |
| (Exact name of Registrant as specified in its charter)                                                                                                                                                                                                                                                                                                                                                                 |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Delaware                                                                                                                                                                                                                                                                                                                                                                                                               |   | 77-0201147 |
| (State or other jurisdiction ofincorporation or organization)                                                                                                                                                                                                                                                                                                                                                          |   | (I.R.S. EmployerIdentification Number) |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| 4300 North First StreetSan Jose, California 95134                                                                                                                                                                                                                                                                                                                                                                      |
| (Address, including zip code, of principal executive offices)                                                                                                                                                                                                                                                                                                                                                          |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |   |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Harmonic Inc. 2002 Employee Stock Purchase PlanHarmonic Inc. 1995 Stock Plan                                                                                                                                                                                                                                                                                                                                           |
| (Full titles of the plans)                                                                                                                                                                                                                                                                                                                                                                                             |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Timothy C. ChuGeneral Counsel, SVP HR and Corporate SecretaryHarmonic Inc.4300 North First StreetSan Jose, California 95134(408) 542-2500(Name, address and telephone number, including area code, of agent for service)                                                                                                                                                                                               |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Copy to:                                                                                                                                                                                                                                                                                                                                                                                                               |
| Robert G. DayWilson Sonsini Goodrich & RosatiProfessional Corporation650 Page Mill RoadPalo Alto, California 94304(650) 493-9300                                                                                                                                                                                                                                                                                   |
|                                                                                                                                                                                                                                                                                                                                                                                                                   |
| Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): |
| Large accelerated filer o                                                                                                                                                                                                                                                                                                                                                                                         |   |   |   | Accelerated filer | x |
| Non-accelerated filer    o                                                                                                                                                                                                                                                                                                                                                                    | Smaller reporting company | o |
|                                                                                                                                                                                                                                                                                                                                                                                                                   | Emerging growth company | o |

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| Title of Securities to be Registered                                     | Amount to be registered (1) | Proposed Maximum Offering Price Per Share | Proposed Maximum Aggregate Offering Price | Amount of Registration Fee |
| Common Stock (par value $0.001 per share):                               |   |   |   |   |
| -    Harmonic Inc. 2002 Employee Stock Purchase Plan | 1,000,000 | $4.77 (2) | $4,770,000 | $578.12 |
| -    Harmonic Inc. 1995 Stock Plan                   | 3,500,000 | $5.61 (3) | $19,635,000 | $2,379.76 |
| Total                                                                    | 4,500,000 |   | $24,405,000 | $2,957.88 |

|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
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| (1) | Pursuant to Rule 416(a) of the Securities Act of 1933, as amended (the “Securities Act”), this registration statement shall also cover any additional shares of the Registrant’s common stock that become issuable under the Harmonic Inc. 2002 Employee Stock Purchase Plan (the “ESPP”) or the Harmonic Inc. 1995 Stock Plan by reason of any stock dividend, stock split, recapitalization or other similar transaction effected without receipt of consideration that increases the number of the Registrant’s outstanding shares of common stock. |

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| (2) | Estimated in accordance with Rules 457(c) and 457(h) of the Securities Act solely for the purpose of calculating the registration fee on the basis of 85% of $5.61 per share, which represents the average of the high and low prices of the Registrant’s common stock as reported on The NASDAQ Global Select Market on June 26, 2019. Pursuant to the ESPP, the purchase price of the shares of the Registrant’s common stock reserved for issuance thereunder will be at least 85% of the lower of the fair market value of the Registrant’s common stock on the first trading day of the offering period or on the exercise date. |

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| (3) | Estimated in accordance with Rules 457(c) and 457(h) under the Securities Act solely for the purpose of calculating the registration fee on the basis of $5.61 per share, which represents the average of the high and low prices of the Registrant’s common stock as reported on The NASDAQ Global Select Market on June 26, 2019. |

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| (1)     | The Registrant’s Annual Report on Form 10-K (File No. 000-25826) for its fiscal year ended December 31, 2018, filed with the Commission on March 1, 2019 pursuant to Section 13(a) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”); |
|    |   |
| (2)     | All other reports filed pursuant to Section 13(a) or 15(d) of the Exchange Act since the end of the fiscal year covered by the Registrant’s Annual Report referred to in (1) above (except to the extent that information therein is furnished to and not filed with the Commission); and |
|    |   |
| (3)     | The description of the Registrant’s Common Stock contained in the Company’s Registration Statement on Form 8-A dated April 6, 1995, pursuant to Section 12(b) of the Exchange Act, including any amendment or report filed for the purpose of updating such description. |

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| • | The Registrant shall indemnify its directors and officers for serving the Registrant in those capacities or for serving other business enterprises at the Registrant’s request, to the fullest extent permitted by Delaware law. Delaware law provides that a corporation may indemnify such person if such person acted in good faith and in a manner such person reasonably believed to be in or not opposed to the best interests of the Registrant and, with respect to any criminal proceeding, had no reasonable cause to believe such person’s conduct was unlawful. |

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| • | The Registrant may, in its discretion, indemnify employees and agents in those circumstances where indemnification is permitted by applicable law. |

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| • | The Registrant is required to advance expenses, as incurred, to its directors and officers in connection with defending a proceeding, except that such director or officer shall undertake to repay such advances if it is ultimately determined that such person is not entitled to indemnification. |

|         |                                                                                                                                                                                                                                                                                                           |
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| • | The Registrant will not be obligated pursuant to the amended and restated bylaws to indemnify a person with respect to proceedings initiated by that person, except with respect to proceedings authorized by the Registrant’s board of directors or brought to enforce a right to indemnification. |

|         |                                                                                                                                                                                                                                                                                                                  |
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| • | The rights conferred in the amended and restated certificate of incorporation and amended and restated bylaws are not exclusive, and the Registrant is authorized to enter into indemnification agreements with its directors, officers, employees and agents and to obtain insurance to indemnify such persons. |

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| • | The Registrant may not retroactively amend the bylaw provisions to reduce its indemnification obligations to directors, officers, employees and agents. |

|               |
|---------------|
|               |  |
|          |
|          |   |
| ExhibitNumber | Description of Exhibit |
| 5.1           | Opinion of Wilson Sonsini Goodrich & Rosati, P.C. |
| 10.1          | Harmonic Inc. 2002 Employee Stock Purchase Plan, as amended and restated effective as of June 5, 2019. |
| 10.2          | Harmonic Inc. 1995 Stock Plan, as amended and restated effective as of June 5, 2019. |
| 23.1          | Consent of Armanino LLP, independent registered public accounting firm. |
| 23.2          | Consent of PricewaterhouseCoopers LLP, independent registered public accounting firm. |
| 23.3          | Consent of Wilson Sonsini Goodrich & Rosati, P.C. (included in Exhibit 5.1 hereto). |
| 24.1          | Power of Attorney (contained on signature page hereto). |

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|-----|-----------------------------------------------|
| (A) | The undersigned Registrant hereby undertakes: |

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| (1) | To file, during any period in which offers or sales are being made, a post-effective amendment to this Registration Statement: |

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| (i) | To include any prospectus required by Section 10(a)(3) of the Securities Act; |

|      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
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| (ii) | To reflect in the prospectus any facts or events arising after the effective date of the Registration Statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the Commission pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than a 20 percent change in the maximum aggregate offering price set forth in the “Calculation of Registration Fee” table in the effective Registration Statement; and |

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| (iii) | To include any material information with respect to the plan of distribution not previously disclosed in the Registration Statement or any material change to such information in this Registration Statement. |

|     |                                                                                                                                                                                                                                                                                                                                       |
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| (2) | That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. |

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| (3) | To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering. |

|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (B) | The undersigned Registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Registrant’s annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this Registration Statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. |

|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| (C) | Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions, or otherwise, the Registrant has been advised that, in the opinion of the Commission, such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the Registrant of expenses incurred or paid by a director, officer or controlling person of the Registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the Registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. |

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|               |  |
| HARMONIC INC. |
|          |   |
| By:           |   |
|          | Patrick J. Harshman |
|          | President and Chief Executive Officer |

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| Signature                                                          | Title | Date |
| ______________________(Patrick J. Harshman)                        | President, Chief Executive Officer and Director(Principal Executive Officer) | June 28, 2019 |
| ___________________   (Sanjay Kalra)                | Chief Financial Officer(Principal Financial and Accounting Officer) | June 28, 2019 |
| ___________________    (Patrick Gallagher)     | Chairman of the Board | June 28, 2019 |
| ___________________    (Deborah L. Clifford)   | Director | June 28, 2019 |
| ___________________(David Krall)                                   | Director | June 28, 2019 |
| ___________________    (Mitzi Reaugh)          | Director | June 28, 2019 |
| ___________________    (Susan G. Swenson)      | Director | June 28, 2019 |
| ____________________    (Nikos Theodosopoulos) | Director | June 28, 2019 |