Chiefs of Mission for Argentina
- Caesar Augustus Rodney (1823-1824)
- John Murray Forbes (1825-1831)
- Francis Baylies (1832-1832)
- William Brent (1844-1846)
- William Alexander Harris (1846-1851)
- John Strother Pendleton (1851-1854)
- William Henry Bissell (1853-)
- James A. Peden (1854-1857)
- James A. Peden (1856-1858)
- Mirabeau Buonaparte Lamar (1857-)
- Benjamin Cudworth Yancey (1858-)
- John Franklin Cushman (1859-1861)
- Robert M. Palmer (1861-1862)
- Robert C. Kirk (1862-1866)
- Alexander Asboth (1866-1868)
- Henry Gaither Worthington (1868-1869)
- Robert C. Kirk (1869-1871)
- Julius White (1872-1873)
- Thomas Ogden Osborn (1874-)
- Thomas Ogden Osborn (1884-1885)
- Bayless W. Hanna (1885-)
- Bayless W. Hanna (1887-1889)
- John Robert Graham Pitkin (1889-1893)
- William Insco Buchanan (1894-1899)
- William Paine Lord (1899-1903)
- John Barrett (1903-1904)
- Arthur Matthias Beaupre (1904-1908)
- Spencer Fayette Eddy (1908-1909)
- Huntington (Francis Mairs Huntington-Wilson) Wilson (1909-)
- Charles Hitchcock Sherrill (1909-1910)
- John Ridgely Carter (1911-)
- John Work Garrett (1911-1913)
- Frederic Jesup Stimson (1914-1921)
- John Wallace Riddle (1921-1925)
- Peter Augustus Jay (1925-1926)
- Robert Woods Bliss (1927-1933)
- Alexander Wilbourne Weddell (1933-1938)
- Norman Armour (1939-1944)
- Spruille Braden (1945-1945)
- George Strausser Messersmith (1946-1947)
- James Bruce (1947-1949)
- Stanton Griffis (1949-1950)
- Ellsworth Bunker (1951-1952)
- Albert Frank Nufer (1952-1956)
- Willard Leon Beaulac (1956-1960)
- Roy Richard Rubottom (1960-1961)
- Robert Mills McClintock (1962-1964)
- Edwin McCammon Martin (1964-1968)
- Carter Lane Burgess (1968-1969)
- John Davis Lodge (1969-1973)
- Robert Charles Hill (1973-1977)
- Raul Hector Castro (1977-1980)
- Harry Walter Shlaudeman (1980-1983)
- Francis Vincent Ortiz (1983-1986)
- Theodore E. Gildred (1986-1989)
- Terence Alphonso Todman (1989-1993)
- James Richard Cheek (1993-1996)
- Hassan Nemazee (1999-)
- James Donald Walsh (2000-2003)
- Lino Gutierrez (2003-2006)
- Earl Anthony Wayne (2006-2009)
- Vilma S. Martinez (2009-)
- William Graham Walker (-)
- Harvey Magee Watterson (-)
- Charles William LeGendre (-)
- Richard Pollard (-)