Chiefs of Mission for Costa Rica
- John Slidell (1853-)
- Solon Borland (1853-)
- Mirabeau Buonaparte Lamar (1858-)
- Alexander Dimitry (1859-1861)
- Charles N. Riotte (1861-1867)
- Albert Gallatin Lawrence (1866-1868)
- Jacob Beeson Blair (1868-1873)
- George McWillie Williamson (1873-)
- Cornelius Ambrose Logan (1879-1882)
- Henry Cook Hall (1882-)
- Henry Cook Hall (1882-1889)
- Lansing Bond Mizner (1889-1890)
- Romualdo Pacheco (1890-1891)
- Richard Cutts Shannon (1891-1893)
- Lewis Baker (1893-1897)
- William Lawrence Merry (1897-)
- William Lawrence Merry (1907-)
- William Lawrence Merry (1908-)
- Lewis David Einstein (1911-1911)
- Edward Joseph Hale (1913-)
- Roy Tasco Davis (1922-1930)
- Hans Frederick Arthur Schoenfeld (1929-)
- Charles Christopher Eberhardt (1930-1933)
- Leo R. Sack (1933-1937)
- Edward Albright (1937-)
- William Harrison Hornibrook (1937-1941)
- Arthur Bliss Lane (1941-1942)
- Robert McGregor Scotten (1942-1943)
- Fay Allen Des Portes (1943-1944)
- Hallett Johnson (1944-1947)
- Walter Joseph Donnelly (1947-1947)
- Nathaniel Penistone Davis (1947-1949)
- Joseph Flack (1949-1950)
- Philip Bracken Fleming (1951-1953)
- Robert Charles Hill (1953-1954)
- Robert Forbes Woodward (1954-1958)
- Whiting Willauer (1958-1961)
- Raymond L. Telles (1961-1967)
- Clarence A. Boonstra (1967-1969)
- Walter Christian Ploeser (1970-1972)
- Viron Peter Vaky (1972-1974)
- Terence Alphonso Todman (1974-1977)
- Marvin Weissman (1977-1980)
- Francis J. McNeil (1980-1983)
- Curtin Winsor (1983-1985)
- Arthur Winston Lewis (1985-1987)
- Lewis Arthur Tambs (1985-1987)
- Deane Roesch Hinton (1987-1990)
- Luis Guinot (1991-1993)
- Robert Homme (1993-1993)
- Donald Harrington (1993-1993)
- Joseph Beceila (1993-1994)
- Peter John De Vos (1994-1997)
- Thomas J. Dodd (1997-2001)
- John J. Danilovich (2001-2004)
- Mark Landale (2005-)
- Peter E. Cianchette (2008-2009)
- Anne Slaughter Andrews (2009-)
- Charles N. Riotte (-)
- Thaddeus Phelps Mott (-)
- Stanton Dean Anderson (-)
- John Funk Martin (-)
- Stewart Johnson (-)