Nancy Bikoff Pettit (born 1953) is an American diplomat and served as Ambassador of the United States of America to Latvia from 2015 until July 14, 2019.

Her father was a physician and clinical assistant professor of family practice at the State University of New York at Stony Brook, L.I.

[4] Following her graduate studies, Pettit worked for as a research assistant at the Library of Congress and at the U.S. Board for International Broadcasting.

She returned to Washington in 2010 as director of the Office of Policy Planning and Coordination in the Bureau of International Narcotics and Law Enforcement.

[5] Following her nomination by President Barack Obama,[6] Pettit was confirmed by the Senate on June 24, 2015, as the Ambassador to the Republic of Latvia.

[7] In her role as ambassador she has voiced assurances that the United States will stand by its NATO commitments,[8] and welcomed U.S. General Philip Breedlove as he completed a tour through the Baltics and Poland, and joined her in thanking U.S. and Latvian troops for their service.