Exhibit 99.4

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the report of Celestica Inc. (the “Company”) on Form 6-K for the quarter and year ended December 31, 2015, as furnished to the Securities and Exchange Commission on the date hereof (the “Report”), each of Robert A. Mionis, as Chief Executive Officer of the Company, and Darren G. Myers, as Chief Financial Officer of the Company, hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

January 28, 2016
	/s/ Robert A. Mionis
	Robert A. Mionis
	Chief Executive Officer
January 28, 2016
	/s/ Darren G. Myers
	Darren G. Myers
	Chief Financial Officer

A signed original of this written statement has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.