Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Each of the undersigned hereby certifies, in his capacity as an officer of Towers Watson & Co. (the “Company”), for purposes of 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of his knowledge:

• The Annual Report of the Company on Form 10-K for the period ended June 30, 2013, fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

• The information contained in such report fairly presents, in all material respects, the financial condition and results of operation of the Company.

Date: August 15, 2013

/s/ John J. Haley

John J. Haley

Chief Executive Officer

/s/ Roger F. Millay

Roger F. Millay

Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to Towers Watson & Co. and will be retained by Towers Watson & Co. and furnished to the Securities and Exchange Commission or its staff upon request.