Dionex (DNEX) 10-Q 2007 Q3 Quarterly report

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, Lukas Braunschweiler, Chief Executive Officer of Dionex Corporation, hereby certifies that, to the best of his knowledge:

1. Dionex Corporation’s Quarterly Report on Form 10-Q for the period ended March 31, 2007, and to which this Certification is attached (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

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

By: Name:	/s/ Lukas BraunschweilerLukas Braunschweiler
Title:	President, Chief Executive Officer and Director
Date:	May 10, 2007