Principal Officers and Chiefs of Mission, by Name: T

Note: Career Foreign Service appointees are asterisked.

• Alphonso Taft (1810–1891)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (1882–1884)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1884–1885)
• Julia Vadala Taft (1942–)
  • Assistant Secretary of State for Population, Refugees, and Migration Affairs (1997–2001)
• William Howard Taft III (1915–1991)
  • Ambassador Extraordinary and Plenipotentiary, Ireland (1953–1957)
• William Howard Taft IV (1945–)
  • U.S. Permanent Representative on the Council of the North Atlantic Treaty Organization (1989–1992)
  • Legal Adviser (2001–2005)
• Linda Swartz Taglialatela (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Dominica (2015)
  • Ambassador Extraordinary and Plenipotentiary, Barbados (2015)
  • Ambassador Extraordinary and Plenipotentiary, Antigua and Barbuda (2015)
  • Ambassador Extraordinary and Plenipotentiary, Grenada (2015)
  • Ambassador Extraordinary and Plenipotentiary, Saint Vincent and the Grenadines (2015)
  • Ambassador Extraordinary and Plenipotentiary, Saint Lucia (2015)
  • Ambassador Extraordinary and Plenipotentiary, Saint Kitts and Nevis (2015)
• Phillips Talbot (1915–2010)
  • Assistant Secretary of State for Near Eastern Affairs (1961–1965)
  • Ambassador Extraordinary and Plenipotentiary, Greece (1965–1969)
• Strobe (Nelson Strobridge) Talbott III (1946–)
  • Ambassador at Large (1993–1994)
  • Deputy Secretary of State (1994–2001)
• Puneet Talwar (1965–)
  • Assistant Secretary of State for Politico-Military Affairs (2014–2017)
• Lewis Arthur Tambs (1927–)
  • Ambassador Extraordinary and Plenipotentiary, Colombia (1983–1985)
  • Ambassador Extraordinary and Plenipotentiary, Costa Rica (1985–1987)
• *Lucy Tamlyn (1955–)
  • Ambassador Extraordinary and Plenipotentiary, Benin (2015–2018)
  • Ambassador Extraordinary and Plenipotentiary, Central African Republic (2019)
• Elizabeth M. Tamposi (1955–)
  • Assistant Secretary of State for Consular Affairs (1989–1992)
• Morse H. Tan (?–)
  • Ambassador at Large (2019)
• Gerald Frederick Tape (1915–2005)
  • Representative of the U.S.A. to the International Atomic Energy Agency (Vienna) (1973–1977)
• Donald R. Tapia (?–)
  • Ambassador Extraordinary and Plenipotentiary, Jamaica (2019)
• John Lindsley Tappin (1906–1964)
  • Ambassador Extraordinary and Plenipotentiary, Libya (1954–1958)
• *Peter Tarnoff (1937–)
  • Executive Secretary (1977–1981)
  • Under Secretary of State for Political Affairs (1993–1997)
• Curtis William Tarr (1924–)
  • Under Secretary of State for Arms Control and International Security Affairs (1972–1973)
• Daniel K. Tarullo (1952–)
  • Assistant Secretary of State for Economic, Energy, and Business Affairs (1993–1996)
• *Henry Joseph Tasca (1912–1979)
  • Ambassador Extraordinary and Plenipotentiary, Morocco (1965–1969)
  • Ambassador Extraordinary and Plenipotentiary, Greece (1969–1974)
• Nicholas F. Taubman (1935–)
  • Ambassador Extraordinary and Plenipotentiary, Romania (2005–2008)
• Ellen O. Tauscher (1951–)
  • Under Secretary of State for Arms Control and International Security Affairs (2009–2012)
• Bayard Taylor (1825–1878)
  • Envoy Extraordinary and Minister Plenipotentiary, Germany (1878)
• Charles Henry James Taylor (1857–1898)
  • Minister Resident/Consul General, Liberia (1887)
  • Envoy Extraordinary and Minister Plenipotentiary, Bolivia (Not commissioned; nomination not confirmed by the Senate.)
• *Clyde D. Taylor (1937–)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (1985–1988)
• Francis Xavier Taylor (1948–)
  • Director of the Bureau of Counterterrorism (2001–2002)
  • Ambassador at Large (2001)
  • Ambassador at Large (2001–2004)
  • Director of the Office of Foreign Missions (2002–2005)
  • Assistant Secretary of State for Diplomatic Security (2002–2005)
• George Taylor Jr. (?–)
  • Chief Clerk (1792–1798)
• Hannis Taylor (1851–1922)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1893–1897)
• Henry Junior Taylor (1902–1984)
  • Ambassador Extraordinary and Plenipotentiary, Switzerland (1957–1961)
• *Henry Landes Taylor (1918–)
  • Chargé d’Affaires ad interim, Panama (1964)
• *John Jackson Taylor (1931–)
  • Principal Officer, Cuba (1990)
• Joseph Z. Taylor (1927–)
  • Deputy Inspector General of Foreign Assistance (1976–1977)
• *Lawrence Palmer Taylor (1940–)
  • Director of the Foreign Service Institute (1992–1995)
  • Ambassador Extraordinary and Plenipotentiary, Estonia (1995–1997)
• Mary E. Taylor (?–)
  • Assistant Secretary of State for Legislative Affairs (2018)
• Maxwell Davenport Taylor (1901–1987)
  • Ambassador Extraordinary and Plenipotentiary, South Vietnam (1964–1965)
• Myron Charles Taylor (1874–1959)
  • Personal Representative of the President, Holy See (1950)
• *Paul D. Taylor (1939–)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1988–1992)
• *Rush Walker Taylor Jr. (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Togo (1988–1990)
• *Teddy Bernard Taylor (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Solomon Islands (2009–2012)
  • Ambassador Extraordinary and Plenipotentiary, Papua New Guinea (2009–2012)
  • Ambassador Extraordinary and Plenipotentiary, Vanuatu (2009–2012)
• William B. Taylor Jr. (1947–)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (2006–2009)
• *Richard W. Teare (1937–)
  • Ambassador Extraordinary and Plenipotentiary, Solomon Islands (1993–1996)
  • Ambassador Extraordinary and Plenipotentiary, Papua New Guinea (1993–1996)
  • Ambassador Extraordinary and Plenipotentiary, Vanuatu (1993–1996)
• Evelyn Irene Hoopes Teegan (1931–)
  • Ambassador Extraordinary and Plenipotentiary, Fiji (1989–1993)
  • Ambassador Extraordinary and Plenipotentiary, Kiribati (1989–1993)
  • Ambassador Extraordinary and Plenipotentiary, Tonga (1989–1993)
  • Ambassador Extraordinary and Plenipotentiary, Tuvalu (1989–1993)
• Peter Barry Teeley (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Canada (1992–1993)
• *John F. Tefft (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Lithuania (2000–2003)
  • Ambassador Extraordinary and Plenipotentiary, Georgia (2005–2009)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (2009–2013)
  • Ambassador Extraordinary and Plenipotentiary, Russia (2014–2017)
• *Donald Gene Teitelbaum (1963–)
  • Ambassador Extraordinary and Plenipotentiary, Ghana (2008–2012)
• *Mara R. Tekach (?–)
  • Chargé d’Affaires, Cuba (2018–2020)
• Raymond L. Telles Jr. (1915–2013)
  • Ambassador Extraordinary and Plenipotentiary, Costa Rica (1961–1967)
• *Alaina B. Teplitz (1969–)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (2015–2018)
  • Ambassador Extraordinary and Plenipotentiary, Maldives (2018)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (2018)
• Peter Terpeluk (1948–2011)
  • Ambassador Extraordinary and Plenipotentiary, Luxembourg (2002–2005)
• Daniel James Terra (1911–1996)
  • Ambassador at Large (1981–1989)
• Alexander Watkins Terrell (1827–1912)
  • Envoy Extraordinary and Minister Plenipotentiary, Turkey (1893–1897)
• Edwin Holland Terrell (1848–1910)
  • Envoy Extraordinary and Minister Plenipotentiary, Belgium (1889–1893)
• *Howard Hobson Tewksbury (1895–1991)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (1950–1952)
• *Nicholas Gilman Thacher (1919–2002)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (1970–1973)
• *Charles Wheeler Thayer (1910–1969)
  • Chargé d’Affaires ad interim, Afghanistan (1942)
• *Harry E.T. Thayer (1927–)
  • Ambassador Extraordinary and Plenipotentiary, Singapore (1980–1984)
• Robert Helyer Thayer (1901–1984)
  • Envoy Extraordinary and Minister Plenipotentiary, Romania (1955–1957)
• Samuel Richard Thayer (1837–1909)
  • Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1889–1893)
• William Sydney Thayer (1830–1864)
  • Consul General, Egypt (1861–1864)
• James Daniel Theberge (1930–1988)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (1975–1977)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1982–1985)
• *Patrick Nickolas Theros (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Qatar (1995–1998)
• James H. Thessin (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (2011–2014)
• Allen Thomas (1830–1907)
  • Envoy Extraordinary and Minister Plenipotentiary, Venezuela (1895–1897)
• *Charles H. Thomas (1934–1998)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (1990–1994)
• Francis Thomas (1799–1876)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1872–1875)
• Gerald Eustis Thomas (1929–)
  • Ambassador Extraordinary and Plenipotentiary, Guyana (1981–1983)
  • Ambassador Extraordinary and Plenipotentiary, Kenya (1983–1986)
• *Linda Thomas-Greenfield (1952–)
  • Ambassador Extraordinary and Plenipotentiary, Liberia (2008–2012)
  • Director General of the Foreign Service (2012–2013)
  • Assistant Secretary of State for African Affairs (2013–2017)
• *Harry Keels Thomas Jr. (1956–)
  • Ambassador Extraordinary and Plenipotentiary, Bangladesh (2003–2005)
  • Executive Secretary (2005–2007)
  • Director General of the Foreign Service (2007–2009)
  • Ambassador Extraordinary and Plenipotentiary, Philippines (2010–2013)
  • Ambassador Extraordinary and Plenipotentiary, Zimbabwe (2015–2018)
• John Addison Thomas (1811–1858)
  • Assistant Secretary of State (1855–1857)
• *John Morgan Thomas (1926–)
  • Assistant Secretary of State for Administration (1973–1979)
• Jon R. Thomas (1946–)
  • Assistant Secretary of State for International Narcotics and Law Enforcement Affairs (1984–1986)
• *William Wayt Thomas Jr. (1925–)
  • Chargé d’Affaires ad interim, Laos (1983)
• William Widgery Thomas Jr. (1839–1927)
  • Minister Resident, Sweden (1883–1885)
  • Envoy Extraordinary and Minister Plenipotentiary, Sweden (1889–1894)
  • Envoy Extraordinary and Minister Plenipotentiary, Sweden (1897–1905)
• Andrea L. Thompson (?–)
  • Under Secretary of State for Arms Control and International Security Affairs (2018)
• David Eugene Thompson (1854–1942)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1902–1905)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1902)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1905)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1906–1909)
• David Preston Thompson (1834–1901)
  • Envoy Extraordinary and Minister Plenipotentiary, Turkey (1892–1893)
• *Dean Richard Thompson (1967–)
  • Chargé d’Affaires ad interim, Romania (2015)
• John Edgar West Thompson (1860–1918)
  • Chargé d’Affaires, Dominican Republic (1885–1889)
  • Minister Resident/Consul General, Haiti (1885–1889)
• *Llewellyn E. Thompson Jr. (1904–1972)
  • Ambassador Extraordinary and Plenipotentiary, Austria (1952–1957)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1957–1962)
  • Career Ambassador (1960)
  • Ambassador at Large (1962–1966)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1966–1969)
• Thomas Larkin Thompson (1838–1898)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1893–1897)
• *Tyler Thompson (1907–2002)
  • Ambassador Extraordinary and Plenipotentiary, Iceland (1960–1961)
  • Director General of the Foreign Service (1961–1964)
  • Ambassador Extraordinary and Plenipotentiary, Finland (1964–1969)
• *W. Kenneth Thompson (1939–)
  • Chargé d’Affaires ad interim, Benin (1978)
• Waddy Thompson Jr. (1798–1868)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1842–1844)
• *Samuel B. Thomsen (1931–)
  • Representative, Marshall Islands (1987–1990)
• Thaddeus Austin Thomson (1853–1927)
  • Envoy Extraordinary and Minister Plenipotentiary, Colombia (1913–1916)
• David H. Thorne (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Italy (2009–2013)
  • Ambassador Extraordinary and Plenipotentiary, San Marino (2009–2013)
• James B. Thornton (1801–1838)
  • Chargé d’Affaires, Peru (1836–1837)
• *Susan A. Thornton (?–)
  • Assistant Secretary of State for East Asian and Pacific Affairs (Not commissioned; nomination of December 19, 2017 withdrawn by the president on August 16, 2018.)
• Willard Long Thorp (1899–1992)
  • Assistant Secretary of State for Economic, Energy, and Business Affairs (1946–1952)
• Enos Thompson Throop (1784–1874)
  • Chargé d’Affaires, Kingdom of the Two Sicilies (1838–1841)
• Vinai K. Thummalapally (1954–)
  • Ambassador Extraordinary and Plenipotentiary, Belize (2009–2013)
• *Raymond LeRoy Thurston (1913–1981)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1961–1963)
  • Ambassador Extraordinary and Plenipotentiary, Somalia (1965–1968)
• *Walter Clarence Thurston (1894–1974)
  • Chargé d’Affaires ad interim, Costa Rica (1922)
  • Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1942–1943)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1943–1944)
  • Ambassador Extraordinary and Plenipotentiary, Bolivia (1944–1946)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1946–1950)
• *Margaret Joy Tibbetts (1919–2010)
  • Ambassador Extraordinary and Plenipotentiary, Norway (1964–1969)
• Warren W. Tichenor (1960–)
  • Representative of the U.S.A. to the European Office of the United Nations (Geneva) (2006–2009)
• *Arthur T. Tienken (1922–2006)
  • Ambassador Extraordinary and Plenipotentiary, Gabon (1978–1981)
  • Ambassador Extraordinary and Plenipotentiary, Sao Tome and Principe (1978–1981)
• Rex W. Tillerson (1952–)
  • Secretary of State (2017–2018)
• James Davidson Tillman (1841–1916)
  • Envoy Extraordinary and Minister Plenipotentiary, Ecuador (1895–1897)
• *Clare Hayes Timberlake (1907–1982)
  • Ambassador Extraordinary and Plenipotentiary, Congo (Kinshasa) (1960–1961)
• William Robert Timken Jr. (1938–)
  • Ambassador Extraordinary and Plenipotentiary, Germany (2005–2008)
• *Benson Ellison Lane Timmons III (1916–1997)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1963–1967)
• *Richard Womser Tims (1912–1996)
  • Chargé d’Affaires ad interim, Hungary (1967)
• *Harold Hilgard Tittmann Jr. (1893–1980)
  • Chargé d’Affaires, Holy See (1944)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1946–1948)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1948–1955)
• Richard Montgomery Tobin (1866–1952)
  • Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1923–1929)
  • Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1923)
  • Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1923)
• Walter Nathan Tobriner (1902–1979)
  • Ambassador Extraordinary and Plenipotentiary, Jamaica (1967–1969)
• David Tod (1805–1868)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1847–1851)
• Charles Stewart Todd (1791–1871)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1841–1846)
• Webster B. Todd Jr. (1938–)
  • Inspector General of Foreign Assistance (1974–1976)
• William Edward Todd (1961–)
  • Ambassador Extraordinary and Plenipotentiary, Brunei (2008–2010)
  • Ambassador Extraordinary and Plenipotentiary, Cambodia (2012–2015)
• *Terence Alphonso Todman (1926–2014)
  • Ambassador Extraordinary and Plenipotentiary, Chad (1969–1972)
  • Ambassador Extraordinary and Plenipotentiary, Guinea (1972–1975)
  • Ambassador Extraordinary and Plenipotentiary, Costa Rica (1974–1977)
  • Assistant Secretary of State for Western Hemisphere Affairs (1977–1978)
  • Ambassador Extraordinary and Plenipotentiary, Spain (1978–1983)
  • Ambassador Extraordinary and Plenipotentiary, Denmark (1983–1989)
  • Ambassador Extraordinary and Plenipotentiary, Argentina (1989–1993)
  • Career Ambassador (1989)
• Kip Tom (?–)
  • U.S. Representative to the United Nations Agencies for Food and Agriculture (Rome) (2019)
• *John Doren Tomlinson (1903–1981)
  • Chargé d’Affaires ad interim, Congo (Kinshasa) ()
• *Peter Tomsen (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Armenia (1995–1998)
• *Victor L. Tomseth (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Laos (1993–1996)
• *Malcolm Toon (1916–2009)
  • Ambassador Extraordinary and Plenipotentiary, Czechoslovakia (1969–1971)
  • Ambassador Extraordinary and Plenipotentiary, Socialist Federal Republic of Yugoslavia (1971–1975)
  • Ambassador Extraordinary and Plenipotentiary, Israel (1975–1976)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1976–1979)
• Alfred Thomas Archimedes Torbert (1833–1880)
  • Minister Resident, El Salvador (1869–1871)
• *Horace Gates Torbert Jr. (1911–2008)
  • Chargé d’Affaires ad interim, Hungary (1962)
  • Ambassador Extraordinary and Plenipotentiary, Somalia (1962–1965)
  • Ambassador Extraordinary and Plenipotentiary, Bulgaria (1970–1973)
• Esteban Edward Torres (1930–)
  • U.S. Permanent Representative to the United Nations Educational, Scientific and Cultural Organization (1978–1979)
• *Ralph James Totten (1877–1949)
  • Minister Resident/Consul General, South Africa (1929–1930)
  • Envoy Extraordinary and Minister Plenipotentiary, South Africa (1930–1937)
• *Donald R. Toussaint (1927–1986)
  • Ambassador Extraordinary and Plenipotentiary, Maldives (1979–1982)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (1979–1982)
• Timothy Lathrop Towell (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (1988–1991)
• Charlemagne Tower (1848–1923)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (1897–1899)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1899–1902)
  • Ambassador Extraordinary and Plenipotentiary, Germany (1902–1908)
• Lawrence Townsend (1860–1954)
  • Envoy Extraordinary and Minister Plenipotentiary, Portugal (1897–1899)
  • Envoy Extraordinary and Minister Plenipotentiary, Belgium (1899–1905)
• *Lynne M. Tracy (?–)
  • Ambassador Extraordinary and Plenipotentiary, Armenia (2019)
• *Thomas M. Tracy (1936–)
  • Assistant Secretary of State for Administration (1979–1983)
• *George Arthur Trail III (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Malawi (1988–1991)
• Trevor D. Traina (?–)
  • Ambassador Extraordinary and Plenipotentiary, Austria (2018)
• *Howard Karl Travers (1893–1976)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1951–1952)
• Lambert Tree (1832–1910)
  • Minister Resident, Belgium (1885–1888)
  • Envoy Extraordinary and Minister Plenipotentiary, Belgium (1888)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1888–1889)
• William Henry Trescot (1822–1898)
  • Assistant Secretary of State (1860)
• Philip Harold Trezise (1912–2001)
  • Representative of the U.S.A. to the Organization for Economic Cooperation and Development (Paris) (1965–1969)
  • Assistant Secretary of State for Economic, Energy, and Business Affairs (1969–1971)
• Philip R. Trimble (1937–)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (1980–1981)
• *William Cattell Trimble (1907–1996)
  • Ambassador Extraordinary and Plenipotentiary, Cambodia (1959–1962)
• Bartlett Tripp (1842–1911)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (1893–1897)
• Nicholas Philip Trist (1800–1874)
  • Chief Clerk (1845–1847)
• *Paul A. Trivelli (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (2005–2008)
• William Trousdale (1790–1872)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1853–1857)
• *Oliver Leonard Troxel Jr. (1919–2013)
  • Ambassador Extraordinary and Plenipotentiary, Zambia (1969–1972)
• *William Clyde Trueheart (1918–1992)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (1969–1971)
• Carlos Trujillo (?–)
  • Permanent Representative of the U.S.A. to the Organization of American States (Washington) (2018)
• *Leslie M. Tsou (?–)
  • Ambassador Extraordinary and Plenipotentiary, Oman (2019)
• George James Tsunis (1967–)
• Roger Wellington Tubby (1910–1991)
  • Assistant Secretary of State for Public Affairs (1961–1962)
  • Representative of the U.S.A. to the European Office of the United Nations (Geneva) (1967–1969)
• *Somerville Pinkney Tuck Jr. (1891–1967)
  • Chargé d’Affaires ad interim, France (1942)
  • Envoy Extraordinary and Minister Plenipotentiary, Egypt (1944–1946)
  • Ambassador Extraordinary and Plenipotentiary, Egypt (1946–1948)
• Charles Keating Tuckerman (1827–1896)
  • Minister Resident, Greece (1868–1871)
• William Tudor (1779–1830)
  • Chargé d’Affaires, Brazil (1827–1830)
• *Matthew Haywood Tueller (1957–)
  • Ambassador Extraordinary and Plenipotentiary, Kuwait (2011–2014)
  • Ambassador Extraordinary and Plenipotentiary, Yemen (2014–2019)
  • Ambassador Extraordinary and Plenipotentiary, Iraq (2019)
• Peter Francis Tufo (1938–)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (1997–2001)
• *Theresa Anne Tull (1936–)
  • Chargé d’Affaires ad interim, Laos (1986)
  • Ambassador Extraordinary and Plenipotentiary, Guyana (1987–1990)
  • Ambassador Extraordinary and Plenipotentiary, Brunei (1993–1996)
• James Milton Turner (1840–1915)
  • Minister Resident/Consul General, Liberia (1871–1878)
• John F. Turner (1942–)
  • Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs (2001–2005)
• William Cochrane Turner (1929–2010)
  • Representative of the U.S.A. to the Organization for Economic Cooperation and Development (Paris) (1974–1977)
• Edward A. Turpin (1804–1880)
  • Minister Resident, Venezuela (1858–1861)
• *John Wills Tuthill (1910–1996)
  • Representative of the U.S.A. to the Organization for Economic Cooperation and Development (Paris) (1961–1962)
  • Representative of the U.S.A. to the European Union, with the rank and status of Ambassador Extraordinary and Plenipotentiary (1962–1966)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1966–1969)
• Robert H. Tuttle (1947–)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (2005–2009)
• Margaret DeBardeleben Tutwiler (1950–)
  • Assistant Secretary of State for Public Affairs (1989–1992)
  • Ambassador Extraordinary and Plenipotentiary, Morocco (2001–2003)
  • Under Secretary of State for Public Diplomacy and Public Affairs (2003–2004)
• *William H. Twaddell (1941–)
  • Chargé d’Affaires ad interim, Mozambique (1983)
  • Ambassador Extraordinary and Plenipotentiary, Mauritania (1988–1991)
  • Chargé d’Affaires ad interim, Liberia (1995)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (1997–2000)
• *Joseph Wright Twinam (1934–2001)
  • Ambassador Extraordinary and Plenipotentiary, Bahrain (1974–1976)
• *Charles H. Twining Jr. (1940–)
  • Chargé d’Affaires ad interim, Benin (1983)
  • Ambassador Extraordinary and Plenipotentiary, Cambodia (1994–1995)
  • Ambassador Extraordinary and Plenipotentiary, Equatorial Guinea (1995–1998)
  • Ambassador Extraordinary and Plenipotentiary, Cameroon (1995–1998)
  • Representative, Cambodia ()
• *William Royall Tyler (1910–2003)
  • Assistant Secretary of State for European and Eurasian Affairs (1962–1965)
  • Ambassador Extraordinary and Plenipotentiary, Netherlands (1965–1969)