Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the reference to our Firm as “Experts” and to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Administaff, Inc. 2008 Employee Stock Purchase Plan of our reports dated February 4, 2008, with respect to the consolidated financial statements of Administaff, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2007, and the effectiveness of internal control over financial reporting of Administaff, Inc. filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Houston, Texas
May 30, 2008
May 30, 2008