List of ambassadors of the United States to the Organization of American States

The following is a list of people who have served as United States Ambassador to the Organization of American States, or the full title, "United States Permanent Representative to the Organization of American States", with the rank and status of Ambassador Extraordinary and Plenipotentiary.^[1]

#	Name	Years served	OAS secretary(ies) general	U.S. president(s)
1	William Dawson	1948	Alberto Lleras Camargo	Harry S. Truman
2	Paul C. Daniels	1948–1951
3	John C. Dreier	1951–1960
			Carlos Dávila	Dwight Eisenhower
			José Antonio Mora
4	deLesseps S. Morrison	1961–1963		John F. Kennedy
5	Ellsworth Bunker	1964–1966		Lyndon Johnson
6	Sol M. Linowitz	1966–1969
			Galo Plaza
7	Joseph J. Jova	1969–1974		Richard Nixon
8	William S. Mailliard	1974–1977
			Alejandro Orfila	Gerald Ford
9	Gale W. McGee	1977–1981		Jimmy Carter
				Ronald Reagan
10	J. William Middendorf	1981–1985
			João Clemente Baena Soares
11	Richard Thomas McCormack	1985–1989
12	Luigi R. Einaudi	1989–1993		George H. W. Bush
				Bill Clinton
13	Harriet C. Babbitt	1993–1997
			César Gaviria
14	Victor Marrero	1998-1999
15	Luis J. Lauredo	2000–2001
16	Roger Francisco Noriega	2001–2003		George W. Bush
17	John F. Maisto	2003–2007
			Miguel Ángel Rodríguez
			Luigi R. Einaudi (acting)
			José Miguel Insulza
18	Hector Morales	2008–2009[1]
19	Carmen Lomellin	2009-2016		Barack Obama
			Luis Almagro
20	Carlos Trujillo	2018–2021		Donald Trump
21	Francisco O. Mora	2023–2025		Joe Biden

Permanent Representative of the United States to the Organization of American States
Seal of the United States Department of State
Flag of a United States chief of mission
Incumbent Thomas R. Hastings Chargé d'affaires since January 11, 2025
Nominator	President of the United States
Inaugural holder	William Dawson
Formation	1948
Website	U.S. Mission – OAS