Principal Officers and Chiefs of Mission, by Name: C

Note: Career Foreign Service appointees are asterisked.

• William Cabaniss (1938–)
  • Ambassador Extraordinary and Plenipotentiary, Czech Republic (2003–2006)
• Carrie B. Cabelka (?–)
  • Assistant Secretary of State for Administration (2019)
• *John Moors Cabot (1901–1981)
  • Envoy Extraordinary and Minister Plenipotentiary, Finland (1950–1952)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (1952)
  • Assistant Secretary of State for Western Hemisphere Affairs (1953–1954)
  • Ambassador Extraordinary and Plenipotentiary, Sweden (1954–1957)
  • Ambassador Extraordinary and Plenipotentiary, Colombia (1957–1959)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1959–1961)
  • Ambassador Extraordinary and Plenipotentiary, Poland (1962–1965)
• *Roxanne J. Cabral (?–)
  • Chargé d’Affaires ad interim, Panama (2018–2020)
  • Ambassador Extraordinary and Plenipotentiary, Marshall Islands (2019)
• Cesar Benito Cabrera (1947–)
  • Ambassador Extraordinary and Plenipotentiary, Seychelles (2006–2009)
  • Ambassador Extraordinary and Plenipotentiary, Mauritius (2006–2009)
• John Lambert Cadwalader (1836–1914)
  • Assistant Secretary of State (1874–1877)
• *Jefferson Caffery (1886–1974)
  • Chargé d’Affaires ad interim, Greece (1923)
  • Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1926–1928)
  • Envoy Extraordinary and Minister Plenipotentiary, Colombia (1928–1933)
  • Assistant Secretary of State (1933)
  • Ambassador Extraordinary and Plenipotentiary, Cuba (1934–1937)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1937–1944)
  • Ambassador Extraordinary and Plenipotentiary, France (1944–1949)
  • Ambassador Extraordinary and Plenipotentiary, Egypt (1949–1955)
• James Cain (1957–)
  • Ambassador Extraordinary and Plenipotentiary, Denmark (2005–2009)
• John Curtis Caldwell (1833–1912)
  • Minister Resident, Paraguay (1874–1876)
  • Minister Resident, Uruguay (1874–1876)
  • Chargé d’Affaires, Paraguay (1876–1882)
  • Chargé d’Affaires, Uruguay (1876–1882)
• *John Kenneth Caldwell (1881–1982)
  • Minister Resident/Consul General, Ethiopia (1943)
  • Envoy Extraordinary and Minister Plenipotentiary, Ethiopia (1943–1945)
• John Lawrence Caldwell (1875–1922)
  • Envoy Extraordinary and Minister Plenipotentiary, Iran (1914–1921)
• John Watson Caldwell (1809–1896)
  • Minister Resident, Bolivia (1868–1869)
• Robert Granville Caldwell (1882–1976)
  • Envoy Extraordinary and Minister Plenipotentiary, Portugal (1933–1937)
  • Envoy Extraordinary and Minister Plenipotentiary, Bolivia (1937–1939)
• *John Archibald Calhoun (1918–2000)
  • Ambassador Extraordinary and Plenipotentiary, Chad (1961–1963)
  • Ambassador Extraordinary and Plenipotentiary, Tunisia (1969–1972)
• John Caldwell Calhoun (1782–1850)
  • Secretary of State (1844–1845)
• William James Calhoun (1848–1916)
  • Envoy Extraordinary and Minister Plenipotentiary, China (1909–1912)
• *Robert J. Callahan (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (2008–2011)
• Churchill Caldom Cambreleng (1786–1862)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1840–1841)
• Simon Cameron (1799–1889)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1862)
• George Washington Campbell (1769–1848)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1818–1820)
• James Fromhart Campbell (1912–1999)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1974–1976)
• James Hepburn Campbell (1820–1895)
  • Minister Resident, Sweden (1864–1867)
  • Minister Resident, Colombia (1866)
• *John Campbell (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (2004–2007)
• Kurt M. Campbell (1957–)
  • Assistant Secretary of State for East Asian and Pacific Affairs (2009–2013)
• Lewis Davis Campbell (1811–1882)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1866)
• *Martha Larzelere Campbell (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Marshall Islands (2009–2012)
• *Piper Anne Wind Campbell (1965–)
  • Ambassador Extraordinary and Plenipotentiary, Mongolia (2012–2015)
• *Cavendish Wells Cannon (1895–1962)
  • Ambassador Extraordinary and Plenipotentiary, Socialist Federal Republic of Yugoslavia (1947–1949)
  • Envoy Extraordinary and Minister Plenipotentiary, Syria (1950–1952)
  • Ambassador Extraordinary and Plenipotentiary, Portugal (1952–1953)
  • Ambassador Extraordinary and Plenipotentiary, Greece (1953–1956)
  • Ambassador Extraordinary and Plenipotentiary, Morocco (1956–1958)
• Carmen G. Cantor (?–)
  • Ambassador Extraordinary and Plenipotentiary, Micronesia, Federated States of (2019)
• Richard Goodwin Capen Jr. (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Spain (1992–1993)
• Edward Capps (1866–1950)
  • Envoy Extraordinary and Minister Plenipotentiary, Greece (1920)
  • Envoy Extraordinary and Minister Plenipotentiary, Montenegro (1920)
• David Lee Carden (1951–)
  • Representative of the U.S.A. to the Association of Southeast Asian Nations (Jakarta) (2011–2013)
• John Cardwell (1837–1893)
  • Agent/Consul General, Egypt (1885–1889)
• *William Ira Cargo (1917–2005)
  • Director of Policy Planning (1969–1973)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (1973–1976)
• *Robert J. Carle (1924–)
  • Chargé d’Affaires ad interim, Libya (1978)
• John Snyder Carlile (1817–1878)
  • Minister Resident, Sweden (Not commissioned; nomination first confirmed and then reconsidered by the Senate, with no final action taken.)
• Samuel Stewart Carlisle (1836–1907)
  • Minister Resident/Consul General, Bolivia (1887–1889)
• *Brian E. Carlson (1947–)
  • Ambassador Extraordinary and Plenipotentiary, Latvia (2001–2004)
• *Delmar Richard Carlson (1918–)
  • Ambassador Extraordinary and Plenipotentiary, Guyana (1966–1969)
• Reynold Erland Carlson (1912–1993)
  • Ambassador Extraordinary and Plenipotentiary, Colombia (1966–1969)
• Richard W. Carlson (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Seychelles (1991–1992)
• *Frank Charles Carlucci III (1930–2018)
  • Ambassador Extraordinary and Plenipotentiary, Portugal (1974–1978)
• Gerald P. Carmen (1930–)
  • Representative of the U.S.A. to the European Office of the United Nations (Geneva) (1984–1986)
• William Carmichael Jr. (?–1795)
  • Chargé d’Affaires, Spain (1790–1794)
• Carol Jones Carmody (1942–)
  • Representative of the U.S.A. on the Council of the International Civil Aviation Organization (Montreal) (1994–1999)
• Albert Sidney Johnson Carnahan (1897–1968)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (1961–1963)
• *Timothy Michael Carney (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Sudan (1995–1996)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1997–1999)
• *James A. Carouso (?–)
  • Chargé d’Affaires ad interim, Australia (2019)
• David Gordon Carpenter (1947–)
  • Assistant Secretary of State for Diplomatic Security (1998–2002)
• Fred Warner Carpenter (1873–1957)
  • Envoy Extraordinary and Minister Plenipotentiary, Morocco (1910–1912)
  • Envoy Extraordinary and Minister Plenipotentiary, Thailand (1912–1913)
• Isaac White Carpenter Jr. (1893–1983)
  • Assistant Secretary of State for Administration (1954–1955)
  • Assistant Secretary of State for Administration (1955–1957)
• Clark Ezra Carr (1836–1919)
  • Minister Resident/Consul General, Denmark (1889–1890)
  • Envoy Extraordinary and Minister Plenipotentiary, Denmark (1890–1893)
• Dabney Smith Carr (1802–1854)
  • Minister Resident, Turkey (1843–1849)
• Wilbur John Carr (1870–1942)
  • Assistant Secretary of State (1924–1933)
  • Assistant Secretary of State (1933–1937)
  • Envoy Extraordinary and Minister Plenipotentiary, Czechoslovakia (1937–1939)
• Walter C. Carrington (1930–)
  • Ambassador Extraordinary and Plenipotentiary, Senegal (1980–1981)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (1993–1997)
• *Johnnie Carson (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Uganda (1991–1994)
  • Ambassador Extraordinary and Plenipotentiary, Zimbabwe (1995–1997)
  • Ambassador Extraordinary and Plenipotentiary, Kenya (1999–2003)
  • Assistant Secretary of State for African Affairs (2009–2013)
  • Chargé d’Affaires ad interim, Mozambique ()
• George W. Carter (1826–1901)
  • Minister Resident, Venezuela (1881–1882)
• *James Garneth Carter (1877–1949)
  • Minister Resident/Consul General, Liberia (1927)
• John Ridgely Carter (1862–1944)
  • Diplomatic Agent, Bulgaria (1909)
  • Envoy Extraordinary and Minister Plenipotentiary, Serbia (1909–1910)
  • Envoy Extraordinary and Minister Plenipotentiary, Romania (1909–1910)
  • Envoy Extraordinary and Minister Plenipotentiary, Bulgaria (1910)
  • Envoy Extraordinary and Minister Plenipotentiary, Serbia (1910–1911)
  • Envoy Extraordinary and Minister Plenipotentiary, Romania (1910–1911)
  • Envoy Extraordinary and Minister Plenipotentiary, Argentina (1911)
• *Philip Carter 3rd (1959–)
  • Ambassador Extraordinary and Plenipotentiary, Guinea (2007–2008)
  • Ambassador Extraordinary and Plenipotentiary, Côte d’Ivoire (2010–2013)
• Thomas L. Carter (?–)
  • Representative of the U.S.A. on the Council of the International Civil Aviation Organization (Montreal) (2017–2020)
• *William Beverly Carter Jr. (1921–1982)
  • Ambassador Extraordinary and Plenipotentiary, Tanzania (1972–1975)
  • Ambassador Extraordinary and Plenipotentiary, Liberia (1976–1979)
  • Ambassador at Large (1979–1981)
• William Hodding Carter III (1935–)
  • Assistant Secretary of State for Public Affairs (1977–1980)
• David Kellogg Cartter (1812–1887)
  • Minister Resident, Bolivia (1861–1862)
• George William Caruth (1842–1921)
  • Envoy Extraordinary and Minister Plenipotentiary, Portugal (1893–1897)
• *John L. Carwile (?–)
  • Ambassador Extraordinary and Plenipotentiary, Latvia (2019)
• *Mary Ann Casey (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Algeria (1991–1994)
  • Ambassador Extraordinary and Plenipotentiary, Tunisia (1994–1997)
• William Joseph Casey (1913–1987)
  • Under Secretary for Economic Growth, Energy, and the Environment (1973–1974)
• William Robert Casey Jr. (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Niger (1982–1985)
• *James Caldwell Cason (1944–)
  • Principal Officer, Cuba (2005)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (2005–2008)
• *Anne S. Casper (?–)
  • Ambassador Extraordinary and Plenipotentiary, Burundi (2016–2019)
• Lewis Cass (1782–1866)
  • Envoy Extraordinary and Minister Plenipotentiary, France (1836–1842)
  • Secretary of State (1857–1860)
• Lewis Cass Jr. (1814–1878)
  • Chargé d’Affaires, Holy See (1849–1854)
  • Minister Resident, Holy See (1854–1858)
  • Envoy Extraordinary and Minister Plenipotentiary, Holy See (Nomination of February 25, 1856, withdrawn before the Senate acted upon it. Nominated to the Pontifical States.)
• William Richards Castle Jr. (1878–1963)
  • Assistant Secretary of State (1927–1929)
  • Ambassador Extraordinary and Plenipotentiary, Japan (1929–1930)
  • Assistant Secretary of State (1930–1931)
  • Under Secretary of State (1931–1933)
• Raul Hector Castro (1916–2015)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1964–1968)
  • Ambassador Extraordinary and Plenipotentiary, Bolivia (1968–1969)
  • Ambassador Extraordinary and Plenipotentiary, Argentina (1977–1980)
• Henry Edward Catto Jr. (1930–2011)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1971–1973)
  • Chief of Protocol (1974–1976)
  • Representative of the U.S.A. to the European Office of the United Nations (Geneva) (1976–1977)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (1989–1991)
  • Director of the U.S. Information Agency (1991–1993)
• *John Patrick Caulfield (1951–)
  • Chargé d’Affaires ad interim, Venezuela (2011)
  • Principal Officer, Cuba (2014)
• *Carey Cavanaugh (?–)
  • Chargé d’Affaires ad interim, Georgia (1992)
• *Charles O. Cecil (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Niger (1996–1999)
• *Judith Beth Cefkin (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Fiji (2014–2018)
  • Ambassador Extraordinary and Plenipotentiary, Kiribati (2014–2018)
  • Ambassador Extraordinary and Plenipotentiary, Tonga (2014–2018)
  • Ambassador Extraordinary and Plenipotentiary, Nauru (2014–2018)
  • Ambassador Extraordinary and Plenipotentiary, Tuvalu (2014–2018)
• Paul L. Cejas (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1998–2001)
• *Robert Francis Cekuta (1954–)
  • Ambassador Extraordinary and Plenipotentiary, Azerbaijan (2014–2018)
• Richard Frank Celeste (1937–)
  • Ambassador Extraordinary and Plenipotentiary, India (1997–2001)
• Joseph Cella (?–)
  • Ambassador Extraordinary and Plenipotentiary, Fiji (2019)
  • Ambassador Extraordinary and Plenipotentiary, Kiribati (2019)
  • Ambassador Extraordinary and Plenipotentiary, Tonga (2019)
  • Ambassador Extraordinary and Plenipotentiary, Nauru (2019)
  • Ambassador Extraordinary and Plenipotentiary, Tuvalu (2019)
• Argeo Paul Cellucci (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Canada (2001–2005)
• *Arnold A. Chacon (1956–)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (2011–2014)
  • Director General of the Foreign Service (2014–2017)
• John Thomas Chain Jr. (1934–)
  • Assistant Secretary of State for Politico-Military Affairs (1984–1985)
• *Wendy Jean Chamberlin (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Laos (1996–1999)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (2001–2002)
• Anne Cox Chambers (1919–)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1977–1981)
• Joseph Ripley Chandler (1792–1880)
  • Minister Resident, Kingdom of the Two Sicilies (1858–1860)
• *Frederic Lincoln Chapin (1929–1989)
  • Ambassador Extraordinary and Plenipotentiary, Ethiopia (1978–1980)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (1981–1984)
• *Selden Chapin (1899–1963)
  • Director General of the Foreign Service (1946–1947)
  • Envoy Extraordinary and Minister Plenipotentiary, Hungary (1947–1949)
  • Ambassador Extraordinary and Plenipotentiary, Netherlands (1949–1953)
  • Ambassador Extraordinary and Plenipotentiary, Panama (1953–1955)
  • Ambassador Extraordinary and Plenipotentiary, Iran (1955–1958)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1960)
• *Vinton Chapin (1900–1982)
  • Ambassador Extraordinary and Plenipotentiary, Luxembourg (1957–1960)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1960)
• Bruce Chapman (1940–)
  • Representative of the U.S.A. to the Vienna Office of the United Nations (Vienna) (1985–1988)
• *Todd C. Chapman (1962–)
  • Chargé d’Affaires ad interim, Mozambique (2010)
  • Ambassador Extraordinary and Plenipotentiary, Ecuador (2015–2019)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (2020)
• Robert B. Charles (1960–)
  • Assistant Secretary of State for International Narcotics and Law Enforcement Affairs (2003–2005)
• *Robert Willard Chase (1921–2003)
  • Chargé d’Affaires ad interim, Swaziland (1971)
• *Asif J. Chaudry (1956–)
  • Ambassador Extraordinary and Plenipotentiary, Moldova (2008–2011)
• *Peter R. Chaveas (1946–)
  • Ambassador Extraordinary and Plenipotentiary, Malawi (1994–1997)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (2001–2004)
• Abram Joseph Chayes (1922–2000)
  • Legal Adviser (1961–1964)
• *James Richard Cheek (1936–2011)
  • Chargé d’Affaires ad interim, Ethiopia (1988)
  • Ambassador Extraordinary and Plenipotentiary, Sudan (1989–1992)
  • Ambassador Extraordinary and Plenipotentiary, Argentina (1993–1996)
• Rajkumar Chellaraj (1955–)
  • Assistant Secretary of State for Administration (2006–2009)
• Person Colby Cheney (1828–1901)
  • Envoy Extraordinary and Minister Plenipotentiary, Switzerland (1892–1893)
• *Martin L. Cheshes (1939–)
  • Ambassador Extraordinary and Plenipotentiary, Djibouti (1993–1996)
• *Irving Gottlieb Cheslaw (1921–2013)
  • Ambassador Extraordinary and Plenipotentiary, Trinidad and Tobago (1979–1981)
  • Chargé d’Affaires ad interim, Jamaica ()
• *Philip T. Chicola (1946–)
  • Chargé d’Affaires ad interim, Brazil (2006)
• Jacob T. Child (1832–1905)
  • Minister Resident/Consul General, Thailand (1886–1891)
• Richard Washburn Child (1881–1935)
  • Ambassador Extraordinary and Plenipotentiary, Italy (1921–1924)
• Mark Bradley Childress (1959–)
  • Ambassador Extraordinary and Plenipotentiary, Tanzania (2014–2016)
• *James Rives Childs (1893–1987)
  • Chargé d’Affaires ad interim, Morocco (1945)
  • Envoy Extraordinary and Minister Plenipotentiary, Saudi Arabia (1946–1949)
  • Envoy Extraordinary and Minister Plenipotentiary, Yemen (1946–1950)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (1949–1950)
  • Ambassador Extraordinary and Plenipotentiary, Ethiopia (1951–1953)
• Thomas Withers Chinn (1791–1852)
  • Chargé d’Affaires, Kingdom of the Two Sicilies (1849)
• Shirley Anita Chisholm (1924–2005)
  • Ambassador Extraordinary and Plenipotentiary, Jamaica (On July 29, 1993, President Clinton announced his intention to nominate Chisholm. The nomination was withdrawn on October 13, 1993.)
• Joseph Hodges Choate (1832–1917)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (1899–1905)
• Timothy A. Chorba (1946–)
  • Ambassador Extraordinary and Plenipotentiary, Singapore (1994–1998)
• *William Harold Christensen (1909–)
  • Chargé d’Affaires ad interim, Trinidad and Tobago ()
• *Richard A. Christenson (1945–)
  • Chargé d’Affaires ad interim, Korea (1997)
• Isaac Peckham Christiancy (1812–1890)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1879–1881)
• Warren Minor Christopher (1925–2011)
  • Deputy Secretary of State (1977–1981)
  • Secretary of State ad interim (1980)
  • Secretary of State ad interim (1980)
  • Secretary of State (1993–1997)
• *Gene Burl Christy (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Brunei (2002–2005)
• William Montgomery Churchwell (1826–1862)
  • Minister Resident, Honduras (Not commissioned; nomination not confirmed by the Senate.)
  • Minister Resident, Guatemala (Not commissioned; nomination not confirmed by the Senate.)
• Peter E. Cianchette (1961–)
  • Ambassador Extraordinary and Plenipotentiary, Costa Rica (2008–2009)
• *Priscilla Ann Clapp (1941–)
  • Chargé d’Affaires, Burma (2002)
• *Gwen C. Clare (1945–)
  • Chargé d’Affaires ad interim, El Salvador (1993)
  • Ambassador Extraordinary and Plenipotentiary, Ecuador (1999–2001)
• Alexander Clark (1826–1891)
  • Minister Resident/Consul General, Liberia (1890–1891)
• Edward Aubrey Clark (1906–1992)
  • Ambassador Extraordinary and Plenipotentiary, Australia (1965–1967)
• *Gilbert Edward Clark (1917–1984)
  • Ambassador Extraordinary and Plenipotentiary, Mali (1968–1970)
  • Ambassador Extraordinary and Plenipotentiary, The Gambia (1970–1973)
  • Ambassador Extraordinary and Plenipotentiary, Senegal (1970–1973)
• *Harlan Bendell Clark (1913–2000)
  • Chargé d’Affaires ad interim, Yemen (1966)
• *Joan Margaret Clark (1922–)
  • Director of the Office of Management Policy (1977–1979)
  • Ambassador Extraordinary and Plenipotentiary, Malta (1979–1981)
  • Director General of the Foreign Service (1981–1983)
  • Assistant Secretary of State for Consular Affairs (1983–1989)
• *John E. Clark (1939–)
  • Chargé d’Affaires ad interim, Dominica (1990)
  • Chargé d’Affaires ad interim, Barbados (1990)
  • Chargé d’Affaires ad interim, Saint Vincent and the Grenadines (1990)
  • Chargé d’Affaires ad interim, Saint Lucia (1990)
• Joshua Reuben Clark Jr. (1871–1961)
  • Under Secretary of State (1928–1929)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1930–1933)
• Mark Wayne Clark (1896–1984)
  • Ambassador Extraordinary and Plenipotentiary, Holy See (Not commissioned; nomination of October 20, 1951, not confirmed by the Senate.)
• Dick Clarence Clark (1929–)
  • Ambassador at Large (1979)
• *Sandra E. Clark (?–)
  • Ambassador Extraordinary and Plenipotentiary, Burkina Faso (2020)
• *Warren Clark Jr. (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Gabon (1987–1989)
  • Ambassador Extraordinary and Plenipotentiary, Sao Tome and Principe (1987–1989)
• *William Clark Jr. (1930–2008)
  • Ambassador Extraordinary and Plenipotentiary, India (1989–1992)
  • Assistant Secretary of State for East Asian and Pacific Affairs (1992–1993)
• William Patrick Clark (1931–2013)
  • Deputy Secretary of State (1981–1982)
• Beverly Leonidas Clarke (1809–1860)
  • Minister Resident, Honduras (1858–1860)
  • Minister Resident, Guatemala (1858–1860)
• *Henry Lee Clarke (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Uzbekistan (1992–1995)
• Richard A. Clarke (1950–)
  • Assistant Secretary of State for Politico-Military Affairs (1989–1992)
• *Walter Sheldon Clarke (1934–)
  • Chargé d’Affaires ad interim, Djibouti ()
• *William Davis Clarke (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Eritrea (1998–2001)
• Eileen B. Claussen (1945–)
  • Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs (1996–1997)
• Brutus Junius Clay (1847–1932)
  • Envoy Extraordinary and Minister Plenipotentiary, Switzerland (1905–1910)
• Cassius Marcellus Clay (1810–1903)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1861)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1861–1862)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1863–1869)
• Henry Clay (1777–1852)
  • Secretary of State (1825–1829)
• James Brown Clay (1817–1864)
  • Chargé d’Affaires, Portugal (1849–1850)
• John Randolph Clay (1808–1885)
  • Chargé d’Affaires, Russia (1836–1837)
  • Chargé d’Affaires, Peru (1847–1853)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1853–1860)
  • Minister Resident/Consul General, Liberia (Not commissioned; nomination not confirmed by the Senate.)
• Thomas Hart Clay (1803–1871)
  • Minister Resident, Nicaragua (1862–1863)
  • Minister Resident, Honduras (1863–1866)
• John Middleton Clayton (1796–1856)
  • Secretary of State (1849–1850)
• Powell Clayton (1833–1914)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1897–1899)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1898–1905)
• William Lockhart Clayton (1880–1966)
  • Under Secretary for Economic Growth, Energy, and the Environment (1946–1947)
• Thomas Green Clemson (1807–1888)
  • Chargé d’Affaires, Belgium (1844–1851)
• Harlan Cleveland (1918–2008)
  • Assistant Secretary of State for International Organization Affairs (1961–1965)
  • U.S. Permanent Representative on the Council of the North Atlantic Treaty Organization (1965–1969)
• *Paul Matthews Cleveland (1931–)
  • Ambassador Extraordinary and Plenipotentiary, New Zealand (1985–1989)
  • Ambassador Extraordinary and Plenipotentiary, Samoa (1986–1989)
  • Ambassador Extraordinary and Plenipotentiary, Malaysia (1989–1992)
• Nathan Clifford (1803–1881)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1848–1849)
• Ray S. Cline (1918–1996)
  • Assistant Secretary of State for Intelligence and Research (1969–1973)
• *John Rufus Clingerman (1931–2004)
  • Ambassador Extraordinary and Plenipotentiary, Lesotho (1979–1981)
• Hillary Rodham Clinton (1947–)
  • Secretary of State (2009–2013)
• *Craig L. Cloud (?–)
  • Ambassador Extraordinary and Plenipotentiary, Botswana (2019)
• *John A. Cloud Jr. (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Lithuania (2006–2009)
• *Daniel Anthony Clune (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Laos (2013–2016)
• *Wat Tyler Cluverius IV (1934–2010)
  • Ambassador Extraordinary and Plenipotentiary, Bahrain (1976–1978)
• Daniel Ray Coats (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Germany (2001–2005)
• Charles Elvan Cobb Jr. (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Iceland (1989–1992)
• Sue McCourt Cobb (1937–)
  • Ambassador Extraordinary and Plenipotentiary, Jamaica (2001–2005)
• *Horace Merle Cochran (1892–1973)
  • Ambassador Extraordinary and Plenipotentiary, Indonesia (1949–1953)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (1949)
• *Robert Douglas Coe (1902–1985)
  • Ambassador Extraordinary and Plenipotentiary, Denmark (1953–1957)
• *Wymberley DeRenne Coerr (1913–1996)
  • Ambassador Extraordinary and Plenipotentiary, Uruguay (1962–1965)
  • Ambassador Extraordinary and Plenipotentiary, Ecuador (1965–1967)
• William Turner Coggeshall (1824–1867)
  • Minister Resident, Ecuador (1866–1867)
• Benjamin Victor Cohen (1894–1983)
  • Counselor (1945–1947)
• Bonnie R. Cohen (1942–)
  • Under Secretary of State for Management (1997–2001)
• Eliot Asher Cohen (1956–)
  • Counselor (2007–2009)
• *Herman Jay Cohen (1932–)
  • Ambassador Extraordinary and Plenipotentiary, The Gambia (1977–1980)
  • Ambassador Extraordinary and Plenipotentiary, Senegal (1977–1980)
  • Assistant Secretary of State for African Affairs (1989–1993)
  • Career Ambassador (1992)
• *Jonathan R. Cohen (?–)
  • Ambassador Extraordinary and Plenipotentiary, Egypt (2019)
• Bainbridge Colby (1869–1950)
  • Secretary of State (1920–1921)
• Charles Woolsey Cole (1906–1978)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1961–1964)
• *Felix Cole (1887–1969)
  • Chargé d’Affaires ad interim, Russia (1919)
  • Envoy Extraordinary and Minister Plenipotentiary, Ethiopia (1945–1947)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (1948–1949)
• Frederick William Backus Coleman (1874–1947)
  • Envoy Extraordinary and Minister Plenipotentiary, Estonia (1922–1931)
  • Envoy Extraordinary and Minister Plenipotentiary, Latvia (1922–1931)
  • Envoy Extraordinary and Minister Plenipotentiary, Lithuania (1922–1931)
  • Envoy Extraordinary and Minister Plenipotentiary, Denmark (1931–1933)
• William Miller Collier (1867–1956)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1905–1909)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1921–1928)
• *James Franklin Collins (1939–)
  • Ambassador at Large (1995–1997)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1996–2001)
• Michael Collins (1930–)
  • Assistant Secretary of State for Public Affairs (1969–1971)
• Leslie Combs (1852–1940)
  • Envoy Extraordinary and Minister Plenipotentiary, Honduras (1902–1907)
  • Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1902–1907)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1906–1911)
• James Monroe Stewart Comly (1832–1887)
  • Minister Resident, Hawaii (1877–1882)
• *Victor Comras (1943–)
  • Chargé d’Affaires, Macedonia (1996)
• James Bryant Conant (1893–1978)
  • Ambassador Extraordinary and Plenipotentiary, Germany (1955–1957)
• *John Condayan (1933–2017)
  • Director of the Office of Foreign Missions (Served as Acting Director, Jan 1988-Jun 1989; a nomination of Sep 16, 1988, was not acted upon by the Senate. Harry W. Porter III served as Acting Director, Jun 1989-Mar 1990 and Jul 1992-May 1993.)
• *John Peter Condon (1920–)
  • Ambassador Extraordinary and Plenipotentiary, Fiji (1978–1980)
  • Ambassador Extraordinary and Plenipotentiary, Tonga (1979–1980)
  • Ambassador Extraordinary and Plenipotentiary, Tuvalu (1979–1980)
• Peter R. Coneway (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Switzerland (2006–2008)
  • Ambassador Extraordinary and Plenipotentiary, Liechtenstein (2006–2008)
• Edwin Hurd Conger (1843–1907)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1890–1893)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1897–1898)
  • Envoy Extraordinary and Minister Plenipotentiary, China (1898–1905)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1905)
• Alfred Conkling (1789–1874)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1852–1853)
• *Michael M. Conlin (1928–)
  • Director of the Office of Management Policy (1979–1980)
• Robert S. Connan (1947–)
  • Ambassador Extraordinary and Plenipotentiary, Iceland (Nomination announced on May 27, 2009, but not submitted to the Senate.)
• *Maura Connelly (1959–)
  • Ambassador Extraordinary and Plenipotentiary, Lebanon (2010–2013)
• Charles Magill Conrad (1804–1878)
  • Secretary of State ad interim (1852)
• *Elinor Greer Constable (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Kenya (1986–1989)
  • Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs (1993–1995)
• *Peter Dalton Constable (1932–2000)
  • Ambassador Extraordinary and Plenipotentiary, Congo (Kinshasa) (1982–1984)
• John P. Constandy (1924–)
  • Deputy Inspector General of Foreign Assistance (1974–1976)
• Clay Constantinou (1951–)
  • Ambassador Extraordinary and Plenipotentiary, Luxembourg (1994–1999)
• *Frances D. Cook (1945–)
  • Ambassador Extraordinary and Plenipotentiary, Burundi (1980–1983)
  • Ambassador Extraordinary and Plenipotentiary, Cameroon (1989–1993)
  • Ambassador Extraordinary and Plenipotentiary, Oman (1995–1999)
• *Frederick Bishop Cook (1950–)
  • Ambassador Extraordinary and Plenipotentiary, Central African Republic (2007–2010)
• Mercer Cook (1903–1987)
  • Ambassador Extraordinary and Plenipotentiary, Niger (1961–1964)
  • Ambassador Extraordinary and Plenipotentiary, Senegal (1964–1966)
  • Ambassador Extraordinary and Plenipotentiary, The Gambia (1965–1966)
• Suzan Denise Johnson Cook (1957–)
  • Ambassador at Large (2011–2013)
• Willis Clifford Cook (1874–1942)
  • Envoy Extraordinary and Minister Plenipotentiary, Venezuela (1921–1929)
• *Goodwin Cooke (1931–)
  • Ambassador Extraordinary and Plenipotentiary, Central African Republic (1978–1980)
• James Cooley (1791–1828)
  • Chargé d’Affaires, Peru (1826–1828)
• John Gardner Coolidge (1863–1936)
  • Envoy Extraordinary and Minister Plenipotentiary, Nicaragua (1908)
• Thomas Jefferson Coolidge (1831–1920)
  • Envoy Extraordinary and Minister Plenipotentiary, France (1892–1893)
• Frank Leslie Coombs (1853–1934)
  • Envoy Extraordinary and Minister Plenipotentiary, Japan (1892–1893)
• Philip Hall Coombs (1915–2006)
  • Assistant Secretary of State for Educational and Cultural Affairs (1961–1962)
• *Carleton Stevens Coon Jr. (1927–)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (1981–1984)
• *Jane Abell Coon (1929–)
  • Ambassador Extraordinary and Plenipotentiary, Bangladesh (1981–1984)
• *Thomas E. Cooney (?–)
  • Chargé d’Affaires ad interim, Argentina (2018)
• *James Ford Cooper (1935–)
  • Chargé d’Affaires, Grenada (1991)
• Jerome Gary Cooper (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Jamaica (1994–1997)
• John Sherman Cooper (1901–1991)
  • Ambassador Extraordinary and Plenipotentiary, India (1955–1956)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (1955–1956)
  • Ambassador Extraordinary and Plenipotentiary, German Democratic Republic (1974–1976)
• R. Clarke Cooper (?–)
  • Assistant Secretary of State for Politico-Military Affairs (2019)
• Richard Newell Cooper (1934–)
  • Under Secretary for Economic Growth, Energy, and the Environment (1977–1981)
  • Secretary of State ad interim (1980)
• William Prentice Cooper Jr. (1895–1969)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1946–1948)
• *Michael H. Corbin (1960–)
  • Chargé d’Affaires ad interim, Syria (2008)
  • Ambassador Extraordinary and Plenipotentiary, United Arab Emirates (2011–2014)
• *Thomas James Corcoran (1920–1994)
  • Ambassador Extraordinary and Plenipotentiary, Burundi (1978–1980)
  • Chargé d’Affaires ad interim, Laos (1978)
• *Maureen Elizabeth Cormack (1957–)
  • Ambassador Extraordinary and Plenipotentiary, Bosnia and Herzegovina (2014–2019)
• David B. Cornstein (?–)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (2018–2020)
• *Edwin Gharst Corr (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1980–1981)
  • Ambassador Extraordinary and Plenipotentiary, Bolivia (1981–1985)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1985–1988)
• Francis Patrick Corrigan (1881–1968)
  • Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1934–1937)
  • Envoy Extraordinary and Minister Plenipotentiary, Panama (1937–1939)
  • Ambassador Extraordinary and Plenipotentiary, Venezuela (1939–1947)
• *Robert Foster Corrigan (1914–2005)
  • Ambassador Extraordinary and Plenipotentiary, Rwanda (1971–1973)
• *Andrew Vincent Corry (1904–1981)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (1964–1967)
  • Ambassador Extraordinary and Plenipotentiary, Maldives (1967–1970)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (1967–1970)
• *James Nicholas Cortada (1914–1999)
  • Chargé d’Affaires ad interim, Yemen (1964)
• Thomas Corwin (1794–1865)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1861–1864)
• William Henry Corwin (1829–1880)
  • Chargé d’Affaires ad interim, Mexico (1866)
• William Aloysious Costello (1904–1969)
  • Ambassador Extraordinary and Plenipotentiary, Trinidad and Tobago (1967–1969)
• James Costos (1963–)
  • Ambassador Extraordinary and Plenipotentiary, Andorra (2013–2017)
  • Ambassador Extraordinary and Plenipotentiary, Spain (2013–2017)
• *Howard Rex Cottam (1910–1984)
  • Ambassador Extraordinary and Plenipotentiary, Kuwait (1963–1969)
• Francis P. Cotter (1922–)
  • Deputy Inspector General of Foreign Assistance (1962–1963)
• *Michael William Cotter (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Turkmenistan (1995–1998)
• Joseph Potter Cotton (1875–1931)
  • Under Secretary of State (1929–1931)
• Jesse Samuel Cottrell (1878–1944)
  • Envoy Extraordinary and Minister Plenipotentiary, Bolivia (1921–1928)
• *John R. Countryman (1933–)
  • Ambassador Extraordinary and Plenipotentiary, Oman (1981–1985)
• *Thomas M. Countryman (1957–)
  • Assistant Secretary of State for International Security and Nonproliferation (2011–2017)
• *William Harrison Courtney (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Kazakhstan (1992–1995)
  • Ambassador Extraordinary and Plenipotentiary, Georgia (1995–1997)
• Cindy Lou Courville (1954–)
  • Representative of the U.S.A. to the African Union (2006–2008)
• Ertharin Cousin (1957–)
  • U.S. Representative to the United Nations Agencies for Food and Agriculture (Rome) (2009–2012)
• *Kevin Covert (?–)
  • Chargé d’Affaires ad interim, Tajikistan (2019)
• *James P. Covey (1944–)
  • Assistant Secretary of State for South and Central Asian Affairs (Nomination not acted upon by the Senate. Edward P. Djerejian served as Acting Assistant Secretary, Aug 24, 1992-Mar 30, 1993.)
• *Sally G. Cowal (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Trinidad and Tobago (1991–1994)
• Edgar Cowan (1815–1885)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (Not commissioned; nomination rejected by the Senate.)
• Myron Melvin Cowen (1898–1965)
  • Ambassador Extraordinary and Plenipotentiary, Australia (1948–1949)
  • Ambassador Extraordinary and Plenipotentiary, Philippines (1949–1951)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1952–1953)
• *Raymond Edwin Cox (1893–)
  • Chargé d’Affaires ad interim, Norway (1940)
• Samuel Sullivan Cox (1824–1889)
  • Envoy Extraordinary and Minister Plenipotentiary, Turkey (1885–1886)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (Not commissioned; nomination rejected by the Senate.)
• Macgrane Coxe (1859–1923)
  • Envoy Extraordinary and Minister Plenipotentiary, Honduras (1896)
  • Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1896–1897)
• Kelly Knight Craft (?–)
  • Ambassador Extraordinary and Plenipotentiary, Canada (2017–2019)
  • Representative of the U.S.A. to the United Nations (2019)
• Gregory B. Craig (1945–)
  • Director of Policy Planning (1997–1998)
• *John Bruce Craig (1945–)
  • Ambassador Extraordinary and Plenipotentiary, Oman (1998–2001)
• Richard K. Cralle (1800–1864)
  • Chief Clerk (1844–1845)
• Michael John Cramer (1835–1898)
  • Minister Resident, Denmark (1870–1876)
  • Chargé d’Affaires, Denmark (1876–1881)
  • Chargé d’Affaires, Switzerland (1881–1882)
  • Minister Resident/Consul General, Switzerland (1882–1885)
• Charles Richard Crane (1858–1939)
  • Envoy Extraordinary and Minister Plenipotentiary, China (1909)
  • Envoy Extraordinary and Minister Plenipotentiary, China (1920–1921)
• Richard Crane (1882–1938)
  • Envoy Extraordinary and Minister Plenipotentiary, Czechoslovakia (1919–1921)
• Lorne W. Craner (1959–)
  • Assistant Secretary of State for Democracy, Human Rights, and Labor (2001–2004)
• Edward F. Crawford (?–)
  • Ambassador Extraordinary and Plenipotentiary, Ireland (2019)
• *William Avery Crawford (1915–2001)
  • Envoy Extraordinary and Minister Plenipotentiary, Romania (1961–1964)
  • Ambassador Extraordinary and Plenipotentiary, Romania (1964–1965)
• William Harris Crawford (1772–1834)
  • Minister Plenipotentiary, France (1813–1815)
• *William Rex Crawford Jr. (1928–2002)
  • Ambassador Extraordinary and Plenipotentiary, Yemen (1972–1974)
  • Ambassador Extraordinary and Plenipotentiary, Cyprus (1974–1978)
• *James Francis Creagan (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Honduras (1996–1999)
• *John S. Creamer (1959–)
  • Chargé d’Affaires ad interim, Bolivia (2012)
• *Marion V. Creekmore Jr. (1939–)
  • Ambassador Extraordinary and Plenipotentiary, Maldives (1989–1992)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (1989–1992)
• *Gene Allan Cretz (1950–)
  • Ambassador Extraordinary and Plenipotentiary, Libya (2008–2012)
  • Ambassador Extraordinary and Plenipotentiary, Ghana (2012–2015)
• Thomas Wilbur Cridler (1850–1914)
  • Third Assistant Secretary of State (1897–1901)
• *Trusten Frank Crigler (1935–)
  • Ambassador Extraordinary and Plenipotentiary, Rwanda (1976–1979)
  • Ambassador Extraordinary and Plenipotentiary, Somalia (1987–1990)
• *John Hugh Crimmins (1919–2007)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1966–1969)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1973–1978)
• Bathsheba Nell Crocker (1968–)
  • Assistant Secretary of State for International Organization Affairs (2014–2017)
• Chester A. Crocker (1941–)
  • Assistant Secretary of State for African Affairs (1981–1989)
• *Edward Savage Crocker II (1895–1968)
  • Ambassador Extraordinary and Plenipotentiary, Iraq (1948–1952)
• *Ryan Clark Crocker (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Lebanon (1990–1993)
  • Ambassador Extraordinary and Plenipotentiary, Kuwait (1994–1997)
  • Ambassador Extraordinary and Plenipotentiary, Syria (1998–2001)
  • Chargé d’Affaires ad interim, Afghanistan (2002)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (2004–2007)
  • Career Ambassador (2004)
  • Ambassador Extraordinary and Plenipotentiary, Iraq (2007–2009)
  • Ambassador Extraordinary and Plenipotentiary, Afghanistan (2011–2012)
• *Kennedy McCampbell Crockett (1920–)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (1967–1970)
• *William James Crockett (1914–1999)
  • Assistant Secretary of State for Administration (1961–1963)
  • Deputy Under Secretary of State for Management (1963–1967)
• James Henry Roberts Cromwell (1898–1990)
  • Envoy Extraordinary and Minister Plenipotentiary, Canada (1940)
• *William Kennedy Cromwell III (1924–2012)
  • Chargé d’Affaires ad interim, Botswana (1971)
• *Edwin Monroe Cronk (1918–)
  • Ambassador Extraordinary and Plenipotentiary, Singapore (1972–1975)
• William Herbert Crook (1925–1997)
  • Ambassador Extraordinary and Plenipotentiary, Australia (1968–1969)
• Elisha Oscar Crosby (1818–1895)
  • Minister Resident, Guatemala (1861–1864)
• *Oliver Sexsmith Crosby (1920–2014)
  • Ambassador Extraordinary and Plenipotentiary, Guinea (1977–1980)
• *Charles Tenney Cross (1922–2008)
  • Ambassador Extraordinary and Plenipotentiary, Singapore (1969–1971)
• John R.A. Crossland (1864–1950)
  • Minister Resident/Consul General, Liberia (1902–1903)
• E. William Crotty (1931–1999)
  • Ambassador Extraordinary and Plenipotentiary, Dominica (1998)
  • Ambassador Extraordinary and Plenipotentiary, Barbados (1998–1999)
  • Ambassador Extraordinary and Plenipotentiary, Antigua and Barbuda (1998–1999)
  • Ambassador Extraordinary and Plenipotentiary, Grenada (1998–1999)
  • Ambassador Extraordinary and Plenipotentiary, Saint Vincent and the Grenadines (1998–1999)
  • Ambassador Extraordinary and Plenipotentiary, Saint Lucia (1998–1999)
  • Ambassador Extraordinary and Plenipotentiary, Saint Kitts and Nevis (1998)
• Jack Dyer Crouch (1958–)
  • Ambassador Extraordinary and Plenipotentiary, Romania (2004–2005)
• Enoch Herbert Crowder (1859–1932)
  • Ambassador Extraordinary and Plenipotentiary, Cuba (1923–1927)
• Philip Kingsland Crowe (1908–1976)
  • Ambassador Extraordinary and Plenipotentiary, Sri Lanka (1953–1956)
  • Ambassador Extraordinary and Plenipotentiary, South Africa (1959–1961)
  • Ambassador Extraordinary and Plenipotentiary, Norway (1969–1973)
  • Ambassador Extraordinary and Plenipotentiary, Denmark (1973–1975)
• William J. Crowe Jr. (1925–2007)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (1994–1997)
• *John Joseph Crowley Jr. (1928–1995)
  • Ambassador Extraordinary and Plenipotentiary, Suriname (1980–1981)
• Philip J. Crowley (1951–)
  • Assistant Secretary of State for Public Affairs (2009–2011)
• *Shawn P. Crowley (?–)
  • Chargé d’Affaires ad interim, Netherlands (2018)
• John Thomas Croxton (1837–1874)
  • Minister Resident, Bolivia (1872–1874)
• William Demos Crum (1859–1912)
  • Minister Resident/Consul General, Liberia (1910–1912)
• William Wood Crump (1819–1897)
  • Chargé d’Affaires, Chile (1844–1847)
• Henry Crumpton (1957–)
  • Director of the Bureau of Counterterrorism (2005–2007)
• John Clarence Cudahy (1887–1943)
  • Ambassador Extraordinary and Plenipotentiary, Poland (1933–1937)
  • Envoy Extraordinary and Minister Plenipotentiary, Ireland (1937–1940)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1940)
  • Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1940)
• James Culbertson (1938–)
  • Ambassador Extraordinary and Plenipotentiary, Netherlands (2008–2009)
• *Paul Trauger Culbertson (1897–1968)
  • Chargé d’Affaires ad interim, Spain (1950)
• William Smith Culbertson (1884–1966)
  • Envoy Extraordinary and Minister Plenipotentiary, Romania (1925–1928)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1928–1933)
• Arthur B. Culvahouse Jr. (?–)
  • Ambassador Extraordinary and Plenipotentiary, Australia (2019)
• Erastus Dean Culver (1803–1889)
  • Minister Resident, Venezuela (1862–1866)
• William Cumback (1829–1905)
  • Minister Resident, Portugal (1870)
• *Hugh Smith Cumming Jr. (1900–1986)
  • Ambassador Extraordinary and Plenipotentiary, Indonesia (1953–1957)
  • Assistant Secretary of State for Intelligence and Research (1957–1961)
• Theodore E. Cummings (1907–1982)
  • Ambassador Extraordinary and Plenipotentiary, Austria (1981–1982)
• *Carl Copeland Cundiff (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Niger (1988–1991)
• *James B. Cunningham (1952–)
  • Ambassador Extraordinary and Plenipotentiary, Israel (2008–2011)
  • Ambassador Extraordinary and Plenipotentiary, Afghanistan (2012–2014)
  • Representative of the U.S.A. to the Vienna Office of the United Nations (Vienna) (Nomination of April 8, 2004, withdrawn on October 8, 2004.)
  • Representative of the U.S.A. to the International Atomic Energy Agency (Vienna) (Nomination of April 8, 2004, withdrawn on October 8, 2004.)
• Carolyn Curiel (1954–)
  • Ambassador Extraordinary and Plenipotentiary, Belize (1997–2001)
• James Michael Curley (1874–1958)
  • Ambassador Extraordinary and Plenipotentiary, Poland (Not commissioned; nomination withdrawn before the Senate acted upon it.)
• Walter Joseph Patrick Curley Jr. (1922–2016)
  • Ambassador Extraordinary and Plenipotentiary, Ireland (1975–1977)
  • Ambassador Extraordinary and Plenipotentiary, France (1989–1993)
• *Brian Dean Curran (1948–)
  • Chargé d’Affaires ad interim, Guinea-Bissau (1976)
  • Ambassador Extraordinary and Plenipotentiary, Mozambique (1997–2000)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (2000–2003)
• Kelley Eckels Currie (?–)
  • Ambassador at Large (2019)
• Jabez Lamar Monroe Curry (1825–1903)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1885–1888)
• Andrew Gregg Curtin (1815–1894)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1869–1872)
• *Charles Boyd Curtis (1878–1962)
  • Envoy Extraordinary and Minister Plenipotentiary, Dominican Republic (1929–1931)
  • Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1931)
• James L. Curtis (1870–1917)
  • Minister Resident/Consul General, Liberia (1915–1917)
• Kenneth Merwin Curtis (1931–)
  • Ambassador Extraordinary and Plenipotentiary, Canada (1979–1981)
• Caleb Cushing (1800–1879)
  • Envoy Extraordinary and Minister Plenipotentiary, China (1843–1844)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1874–1877)
• Courtland Cushing (1809–1856)
  • Chargé d’Affaires, Ecuador (1850–1853)
• John Franklin Cushman (?–1862)
  • Minister Resident, Argentina (1859–1861)
• *Walter Leon Cutler (1931–)
  • Ambassador Extraordinary and Plenipotentiary, Congo (Kinshasa) (1975–1979)
  • Ambassador Extraordinary and Plenipotentiary, Iran (1979)
  • Ambassador Extraordinary and Plenipotentiary, Tunisia (1981–1984)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (1984–1987)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (1988–1989)
• *Leo George Cyr (1909–2003)
  • Ambassador Extraordinary and Plenipotentiary, Rwanda (1966–1971)