6-K

FORM 6-K

SECURITIES AND EXCHANGECOMMISSION

Washington, D.C. 20549

Report of Foreign PrivateIssuer

Pursuant to Rule 13a-16or 15d-16

under the SecuritiesExchange Act of 1934

For the month of March,2023

001-14832

(Commission File Number)

CELESTICA INC.

(Translation of registrant’s name into English)

5140 Yonge Street, Suite 1900

Toronto, Ontario

Canada M2N 6L7

(416) 448-5800

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Indicate by check mark whether the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Indicate by check mark whether the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Furnished Herewith (and incorporated byreference herein)

The information contained in this Form 6-K is not incorporated by reference into any registration statement (or into any prospectus that forms a part thereof) filed by Celestica Inc. with the Securities and Exchange Commission.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

EXHIBIT INDEX

Exhibit 99.1

CELESTICA FILES FORM 20-F

TORONTO, Canada - Celestica Inc. (NYSE, TSX: CLS), a leader in design, manufacturing and supply chain solutions for the world's most innovative companies, today announced that its annual report on Form 20-F for the year ended December 31, 2022 has been filed with the United States Securities and Exchange Commission.

The annual report on Form 20-F can be accessed on the company's website at www.celestica.com in the Investor Relations section. The Form 20-F can also be viewed at www.sedar.com and at www.sec.gov.

The company's shareholders are entitled to receive copies of the Form 20-F free of charge. Shareholders can request the document by contacting [email protected]. Shareholders who have already requested a copy of the Form 20-F will receive this document in the mail.

About Celestica

Celestica enables the world's best brands. Through our recognized customer-centric approach, we partner with leading companies in Aerospace and Defense, Communications, Enterprise, HealthTech, Industrial and Capital Equipment to deliver solutions for their most complex challenges. As a leader in design, manufacturing, hardware platform and supply chain solutions, Celestica brings global expertise and insight at every stage of product development - from the drawing board to full-scale production and after-market services. With talented teams across North America, Europe and Asia, we imagine, develop and deliver a better future with our customers.

For further information on Celestica, visit www.celestica.com.

The company's securities filings can be accessed at www.sedar.com and www.sec.gov.

Contacts: