Gary Anthony Grappo (born 1950)[1] was the United States Ambassador to Oman from September 17, 2006, to June 1, 2009.

[2] [3] Prior to becoming ambassador, Grappo was Deputy Chief of Mission and Minister Counselor of the United States Mission in Riyadh, Saudi Arabia.

He is currently a Distinguished Fellow at the Korbel School for International Studies at the University of Denver.

Grappo holds a BS in Mathematics from the United States Air Force Academy (1972), an MS in Geodesy and Survey Engineering from Purdue University, and an MBA from the Stanford University Graduate School of Business.

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