Foreign Service officer
1994 Assistant Secretary for Population, Refugees, and Migration
1997 Assistant Secretary for Intelligence and Research
Oakley, Robert Bigger (1934- )
Foreign Service officer
1979 Ambassador Extraordinary and Plenipotentiary, Zaire
1982 Ambassador Extraordinary and Plenipotentiary, Somalia
1984 Director, Office of Combatting Terrorism
1988 Ambassador Extraordinary and Plenipotentiary, Pakistan
Oberwetter, James Curtis (1944- )
Non-career appointee
2003 Ambassador Extraordinary and Plenipotentiary, Saudi Arabia
O'Brien, Edward Charles (1860-1927)
Non-career appointee
1905 Envoy Extraordinary and Minister Plenipotentiary, Paraguay and Uruguay
O'Brien, Thomas James (1842-1933)
Non-career appointee
1905 Envoy Extraordinary and Minister Plenipotentiary, Denmark
1907 Ambassador Extraordinary and Plenipotentiary, Japan
1911 Ambassador Extraordinary and Plenipotentiary, Italy
O'Connor, Roderic L. (1921- )
Non-career appointee
1957 Administrator, Bureau of Security and Consular Affairs
O'Donohue, Daniel Anthony (1931- )
Foreign Service officer
1983 Ambassador Extraordinary and Plenipotentiary, Burma
1988 Ambassador Extraordinary and Plenipotentiary, Thailand
O'Dwyer, William (1890-1964)
Non-career appointee
1950 Ambassador Extraordinary and Plenipotentiary, Mexico
Oehlert, Benjamin Hilborn (1909-1985)
Non-career appointee
1967 Ambassador Extraordinary and Plenipotentiary, Pakistan
Ogle, Andrew Jackson (1822-1852)
Non-career appointee
1852 [Charg? d'Affaires, Denmark]
O'Keefe, John Martin (1946- )
Foreign Service officer
2000 Ambassador Extraordinary and Plenipotentiary, Kyrgyzstan
Okun, Herbert Stuart (1930- )
Foreign Service officer
1980 Ambassador Extraordinary and Plenipotentiary, German Democratic Republic
O'Laughlin, John Callan (1873-1949)
Non-career appointee
1909 Assistant Secretary of State (1853-1924)
Olds, Herbert Vincent (1913- )
Foreign Service officer
1962 Charg? d'Affaires ad interim Burundi
Olds, Robert Edwin (1875-1932)
Non-career appointee
1925 Assistant Secretary of State (1924-1944)
1927 Under Secretary of State
O'Leary, John (1947- )
Non-career appointee
1998 Ambassador Extraordinary and Plenipotentiary, Chile
Oliver, Covey Thomas (1913- )
Non-career appointee
1964 Ambassador Extraordinary and Plenipotentiary, Colombia
1967Assistant Secretary for Inter-American Affairs
Olmsted, Mary Seymour (1919- )
Foreign Service officer
1975 Ambassador Extraordinary and Plenipotentiary, Papua New Guinea and Solomon Islands
1978 Ambassador Extraordinary and Plenipotentiary, Solomon Islands
Olney, Richard (1835-1917)
Non-career appointee
1895 Secretary of State
Olsen, Arthur Joseph (1920-2003)
Foreign Service officer
1972 Charg? d'Affaires ad interim. Sweden
Olson, Clinton Louis (1916- )
Foreign Service officer
1972 Ambassador Extraordinary and Plenipotentiary, Sierra Leone
Olson, Jack B. (1920- )
Non-career appointee
1976 Ambassador Extraordinary and Plenipotentiary, The Bahamas
Olson, Lyndon Lowell, Jr. (1947- )
Non-career appointee
1997 Ambassador Extraordinary and Plenipotentiary, Sweden
O'Neal, Emmet (1887-1967)
Non-career appointee
1947 Ambassador Extraordinary and Plenipotentiary, Philippines
Ordway, John Malcolm (1950- )
Foreign Service officer
2001 Ambassador Extraordinary and Plenipotentiary, Armenia
O'Rear, John Davis (1868-1918)
Non-career appointee
1913 Envoy Extraordinary and Minister Plenipotentiary, Bolivia
Orozco, Cristobal Roberto (1944- )
Foreign Service officer
1997 Ambassador Extraordinary and Plenipotentiary, Dominican Republic
Orr, James Lawrence (1822-1873)
Non-career appointee
1872 Envoy Extraordinary and Minister Plenipotentiary, Russia
Orr, Robert D. (1917- )
Non-career appointee
1989 Ambassador Extraordinary and Plenipotentiary, Singapore
Orrick, William Horsley, Jr. (1915- )
Non-career appointee
1962 Deputy Under Secretary for Administration
Orth, Godlove Stein (1817-1882)
Non-career appointee
1875 Envoy Extraordinary and Minister Plenipotentiary, Austria-Hungary
Ortiz, Francis Vincent, Jr. (1926- )
Foreign Service officer
1977 Ambassador Extraordinary and Plenipotentiary, Barbados and Grenada and Special Representative to Antigua, Dominica, St. Christopher/Nevis/Anguilla, St. Lucia, and St. Vincent
1979 Ambassador Extraordinary and Plenipotentiary, Guatemala
1981 Ambassador Extraordinary and Plenipotentiary, Peru
1983 Ambassador Extraordinary and Plenipotentiary, Argentina
Osborn, David Lawrence (1921-1994)
Foreign Service officer
1974 Ambassador Extraordinary and Plenipotentiary, Burma
Osborn, Thomas Andrew (1832-1904)
Non-career appointee
1877 Envoy Extraordinary and Minister Plenipotentiary, Chile
1881 Envoy Extraordinary and Minister Plenipotentiary, Brazil
Osborn, Thomas Ogden (1832-1904)
Non-career appointee
1874 Minister Resident, Argentina
1884 Minister Resident/Consul General, Argentina
Osborne, John Eugene (1858-1943)
Non-career appointee
1913 Assistant Secretary of State (1853-1924)
Osorne, Lithgow (1892-?)
Foreign Service officer
1944 Ambassador Extraordinary and Plenipotentiary, Norway
O'Shaunessy, Elim (1907-1966)
Foreign Service officer
1964 Charg? d'Affaires ad interim, Hungary
O'Shaugnessy, Nelson (1876-1932)
Non-career appointee
1914 Charg? d'Affaires ad interim, Mexico
Ostrander, Nancy (1925- )
Foreign Service officer
1978 Ambassador Extraordinary and Plenipotentiary, Suriname
O'Sullivan, John Louis (1813-1895)
Non-career appointee
1854 Charg? d'Affaires, Portugal
1854 Minister Resident, Portugal
1856 [Envoy Extraordinary and Minister Plenipotentiary, Portugal]
O'Toole, William Joseph (1894-1928)
Non-career appointee
1922 Envoy Extraordinary and Minister Plenipotentiary, Paraguay
Otterbourg, Marcus (?-?)
Non-career appointee
1866 Charg? d'Affaires ad interim, Mexico
1867 Envoy Extraordinary and Minister Plenipotentiary, Mexico
Owen, Henry David (1920- )
Foreign Service officer
1960 Chairman, Policy Planning Council
1978 Ambassador at Large
Owen, Robert Dale (1801-1877)
Non-career appointee
1853 Charg? d'Affaires, Two Sicilies
1854 Minister Resident, Two Sicilies
1856 [Envoy Extraordinary and Minister Plenipotentiary, Two Sicilies]
Owen, Roberts Bishop (1926- )
Non-career appointee
1979 Legal Adviser
Owen, Ruth (Bryan) (Ruth Bryan Rohde) (1885-1954)
Non-career appointee
1933 [Envoy Extraordinary and Minister Plenipotentiary, Denmark and Iceland]
1933 Envoy Extraordinary and Minister Plenipotentiary, Denmark
Owens-Kirkpatrick, Barbro Appelquist (1946- )
Foreign Service officer
1999 Ambassador Extraordinary and Plenipotentiary, Niger
Owsley, Alvin Mansfield (1888-1967)
Non-career appointee
1933 Envoy Extraordinary and Minister Plenipotentiary, Romania
1935 Envoy Extraordinary and Minister Plenipotentiary, Irish Free State
1937 Envoy Extraordinary and Minister Plenipotentiary, Denmark
Oxman, Stephen A. (1945- )
Non-career appointee
1993 Assistant Secretary for European and Canadian Affairs
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