Exhibit 32.1

CERTIFICATION OF THE CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO RULE 13A-14(B) OR RULE 15D-14(B) AND SECTION 1350 OF CHAPTER 63 OF TITLE 18 OF

THE UNITED STATES CODE

The certification set forth below is being submitted in connection with this quarterly report on Form 10-Q (the “Report”) of Logitech International S.A. (“the Company”) for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Bracken P. Darrell, Chief Executive Officer of the Company, and Vincent Pilette, Chief Financial Officer of the Company, each certify that, to the best of his knowledge:

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

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

July 29, 2016

/s/ Bracken P. Darrell

Bracken P. Darrell

President and

Chief Executive Officer

/s/ Vincent Pilette

Vincent Pilette

Chief Financial Officer