NOV (NOV) 10-K/A 2007 FY Annual report (amended)

Exhibit 31.1

CERTIFICATION

I, Merrill A. Miller, Jr., certify that:

(1) I have reviewed this annual report on Form 10-K/A of National Oilwell Varco, Inc. for the fiscal year ended December 31, 2007; and

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report.

Date: March 13, 2008

By:	/s/ Merrill A. Miller, Jr.
Merrill A. Miller, Jr. Chairman, President and Chief Executive Officer