National Instruments (NATI) 8-K Changes in Registrant.s Certifying Accountant

EXHIBIT 16.1

June 10, 2005

Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549

Commissioners:

We have read the statements made by National Instruments Corporation (copy attached), which we understand will be filed with the Commission, pursuant to Item 4.01 of Form 8-K, as part of National Instruments’ Form 8-K report dated June 9, 2005. We agree with the statements concerning our Firm in such Form 8-K.