National Oilwell Varco 2010 Annual Report Download - page 106

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Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the following Registration Statements of National Oilwell Varco, Inc. and each related
Prospectus of our reports dated February 23, 2011, with respect to the consolidated financial statements of National Oilwell Varco, Inc. and the
effectiveness of internal control over financial reporting of National Oilwell Varco, Inc., included in the Annual Report (Form 10-K) of National
Oilwell Varco, Inc. for the year ended December 31, 2010.
Form Description
S-8 National-Oilwell, Inc. Stock Award and Long Term Incentive Plan, Value Appreciation and Incentive Plan A and Value Appreciation
and Incentive Plan B (No. 333-15859)
S-8 National-Oilwell Retirement and Thrift Plan (No. 333-36359)
S-8 Post Effective Amendment No. 3 to the Registration Statement on Form S-4 filed on Form S-8 pertaining to the Dreco Energy Services
Ltd. Amended and Restated 1989 Employee Incentive Stock Option Plan, as amended, and Employment and Compensation
Arrangements Pursuant to Private Stock Option Agreements (No. 333-21191)
S-8 Post Effective Amendment No. 1 on Form S-8 to Registration Statement on Form S-4 pertaining to the IRI International Corporation
Equity Incentive Plan (No. 333-36644)
S-8 National Oilwell Varco, Inc. Long-Term Incentive Plan (No. 333-123310)
S-8 National Oilwell Varco, Inc. Employee Stock Purchase Plan (No. 333-123301)
S-8 Varco International Inc. 2003 Equity Participation Plan; Stock Option Plan for Non-Employee Directors, as amended; Varco
International, Inc. 1990 Stock Option Plan; 1994 Directorsî‚€ Stock Option Plan; Varco International, Inc. 401(k)/Profit Sharing Plan
(No. 333-123287)
S-8 Varco International, Inc. Deferred Compensation Plan (No. 333-123286)
S-8 National-Oilwell, Inc. Amended and Restated Stock Award and Long-Term Incentive Stock Plan (No. 333-118721)
S-4 Registration Statement on Form S-4 for the registration of shares of common stock in conjunction with the merger with Varco
International, Inc. (No. 333-119071)
S-8 National Oilwell Varco, Inc. Long-Term Incentive Plan (No. 333-159333)
/s/ ERNST & YOUNG LLP
Houston, Texas
February 23, 2011