Exhibit 5.01

OPINION OF WILSON SONSINI GOODRICH & ROSATI, PROFESSIONAL CORPORATION

September 24, 2004

Google Inc.

1600 Amphitheatre Parkway

Mountain View, CA 94043

Re: Registration Statement on Form S-8

Ladies and Gentlemen:

We have examined the Registration Statement on Form S-8 to be filed by you with the Securities and Exchange Commission on September 24, 2004 (the “Registration Statement”), in connection with the registration under the Securities Act of 1933, as amended, of 12,867 shares of your Class A common stock, par value $0.001 per share (the “Shares”), all of which are to be issued under the Lifescape Solutions, Inc. 2001 Stock Plan (the “Plan”). As your counsel in connection with this transaction, we have examined the proceedings taken and are familiar with the proceedings proposed to be taken by you in connection with the issuance and sale of the Shares pursuant to the Plan.

It is our opinion that, when issued and sold in the manner described in the Plan and pursuant to the agreements which accompany each grant under the Plan, the Shares will be legally and validly issued, fully-paid and non-assessable.

We consent to the use of this opinion as an exhibit to the Registration Statement, and further consent to the use of our name wherever appearing in the Registration Statement and any amendments thereto.

Very truly yours,

WILSON SONSINI GOODRICH & ROSATI

/s/ Wilson Sonsini Goodrich & Rosati