EXHIBIT 23.03



               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of Brooks Automation,
Inc. for the registration of 153,625 shares of its common stock and to the
incorporation by reference therein of our report dated March 3, 2000, except for
Note 4 as to which the date is March 31, 2000, with respect to the financial
statements of Irvine Optical Company, LLC for the years ended December 31, 1999
and 1998 included in the Annual Report (Form 10-K/A) of Brooks Automation, Inc.
for the year ended September 30, 2001 filed with the Securities and Exchange
Commission.


                                                /s/ Ernst & Young LLP

Woodland Hills, California
April 25, 2002