Principal Officers and Chiefs of Mission, by Name: P

Note: Career Foreign Service appointees are asterisked.

• Romualdo Pacheco (1831–1899)
  • Envoy Extraordinary and Minister Plenipotentiary, El Salvador (1890–1891)
  • Envoy Extraordinary and Minister Plenipotentiary, Costa Rica (1890–1891)
  • Envoy Extraordinary and Minister Plenipotentiary, Honduras (1890)
  • Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1890)
  • Envoy Extraordinary and Minister Plenipotentiary, Nicaragua (1890–1891)
  • Envoy Extraordinary and Minister Plenipotentiary, Honduras (1891–1893)
  • Envoy Extraordinary and Minister Plenipotentiary, Guatemala (1891–1893)
• *Earl LeNoir Packer (1894–1993)
  • Chargé d’Affaires ad interim, Latvia (1940)
  • Chargé d’Affaires ad interim, Burma ()
• *Robert Peter Paganelli (1931–)
  • Ambassador Extraordinary and Plenipotentiary, Qatar (1974–1977)
  • Ambassador Extraordinary and Plenipotentiary, Syria (1981–1984)
• *Edward Page Jr. (1905–1965)
  • Envoy Extraordinary and Minister Plenipotentiary, Bulgaria (1959–1962)
• Susan Page (1964–)
  • Ambassador Extraordinary and Plenipotentiary, South Sudan (2011–2014)
• Thomas Nelson Page (1853–1922)
  • Ambassador Extraordinary and Plenipotentiary, Italy (1913–1919)
• Walter Hines Page (1855–1918)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (1913–1918)
• *Ely Eliot Palmer (1887–1977)
  • Envoy Extraordinary and Minister Plenipotentiary, Afghanistan (1945–1948)
  • Ambassador Extraordinary and Plenipotentiary, Afghanistan (1948)
• John N. Palmer (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Portugal (2001–2004)
• *Joseph Palmer II (1914–1994)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (1960–1964)
  • Director General of the Foreign Service (1964–1966)
  • Assistant Secretary of State for African Affairs (1966–1969)
  • Ambassador Extraordinary and Plenipotentiary, Libya (1969–1972)
• *Larry Leon Palmer (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Honduras (2002–2005)
  • Ambassador Extraordinary and Plenipotentiary, Dominica (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Barbados (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Antigua and Barbuda (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Grenada (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Saint Vincent and the Grenadines (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Saint Lucia (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Saint Kitts and Nevis (2012–2016)
  • Ambassador Extraordinary and Plenipotentiary, Venezuela (Nomination of June 24, 2010, returned to the President on December 22, 2010.)
• Robert M. Palmer (1820–1862)
  • Minister Resident, Argentina (1861–1862)
• *Robie Marcus Hooker Palmer (1941–2013)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (1986–1990)
• *Ronald DeWayne Palmer (1932–2014)
  • Ambassador Extraordinary and Plenipotentiary, Togo (1976–1978)
  • Ambassador Extraordinary and Plenipotentiary, Malaysia (1981–1983)
  • Ambassador Extraordinary and Plenipotentiary, Mauritius (1986–1989)
• Thomas Witherell Palmer (1830–1913)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1889–1890)
• *Virginia E. Palmer (1963–)
  • Ambassador Extraordinary and Plenipotentiary, Malawi (2014–2019)
• *Francisco L. Palmieri (?–)
  • Ambassador Extraordinary and Plenipotentiary, Honduras (Nomination of July 3, 2018 returned by the Senate on January 3, 2019.)
• Victor Henry Palmieri (1930–)
  • Ambassador at Large (1979–1981)
• *A. James Panos (1942–)
  • Chargé d’Affaires, Central African Republic (2007)
• Joseph R. Paolino Jr. (1955–)
  • Ambassador Extraordinary and Plenipotentiary, Malta (1994–1996)
• *Christos Constantine Pappas Jr. (1925–1976)
  • Chargé d’Affaires ad interim, Swaziland ()
• James W. Pardew (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Bulgaria (2002–2005)
• Daniel Parker (1925–1992)
  • Administrator of the Agency for International Development (1973–1977)
• George H. Parker (?–)
  • Minister Resident, Ecuador (Not commissioned; nomination tabled by the Senate.)
• *Maurice S. Parker (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Swaziland (2007–2009)
• Peter Parker (1804–1888)
  • Chargé d’Affaires ad interim, China (1853)
  • Commissioner, China (1855–1857)
• *Richard Bordeaux Parker (1923–2011)
  • Ambassador Extraordinary and Plenipotentiary, Algeria (1974–1977)
  • Chargé d’Affaires ad interim, Algeria (1975)
  • Ambassador Extraordinary and Plenipotentiary, Lebanon (1977–1978)
  • Ambassador Extraordinary and Plenipotentiary, Morocco (1978–1979)
• William Harwar Parker (1826–1896)
  • Minister Resident/Consul General, Korea (1886)
• John Gibson Parkhurst (1824–1906)
  • Envoy Extraordinary and Minister Plenipotentiary, Belgium (1888–1889)
• *Michael E. Parmley (1951–)
  • Principal Officer, Cuba (2008)
• *Mark Robert Parris (1950–)
  • Ambassador Extraordinary and Plenipotentiary, Turkey (1997–2000)
• *James Graham Parsons (1907–1991)
  • Ambassador Extraordinary and Plenipotentiary, Laos (1956–1958)
  • Assistant Secretary of State for East Asian and Pacific Affairs (1959–1961)
  • Ambassador Extraordinary and Plenipotentiary, Sweden (1961–1967)
• Frank Charles Partridge (1861–1943)
  • Envoy Extraordinary and Minister Plenipotentiary, Venezuela (1893–1894)
• James Rudolph Partridge (1823–1884)
  • Minister Resident, Honduras (1862)
  • Minister Resident, El Salvador (1863–1866)
  • Minister Resident, Venezuela (1869–1870)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1871–1877)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1882)
  • Minister Resident, Nicaragua (Not commissioned; nomination withdrawn before the Senate acted upon it.)
• *Richard C. Paschall III (?–)
  • Ambassador Extraordinary and Plenipotentiary, The Gambia (2019)
• *B. Lynn Pascoe (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Malaysia (1998–2001)
  • Ambassador Extraordinary and Plenipotentiary, Indonesia (2004–2007)
• *Carlos Pascual (1958–)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (2000–2003)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (2009–2011)
  • Assistant Secretary of State for Energy Resources (Nominations of February 17, 2012; April 23, 2013; and January 6, 2014, not acted upon by the Senate.)
• *Geeta Pasi (1962–)
  • Ambassador Extraordinary and Plenipotentiary, Djibouti (2011–2014)
  • Ambassador Extraordinary and Plenipotentiary, Chad (2016–2018)
• *David Passage (1942–)
  • Ambassador Extraordinary and Plenipotentiary, Botswana (1990–1993)
• Robert A. Pastor (1947–2014)
  • Ambassador Extraordinary and Plenipotentiary, Panama (Nomination of June 8, 1994, not acted upon by the Senate; withdrawn on January 31, 1995.)
• *Robert Stephen Pastorino (1940–2013)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1991–1994)
• *Anne Woods Patterson (1949–)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1997–2000)
  • Ambassador Extraordinary and Plenipotentiary, Colombia (2000–2003)
  • Assistant Secretary of State for International Narcotics and Law Enforcement Affairs (2005–2007)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (2007–2010)
  • Career Ambassador (2008)
  • Ambassador Extraordinary and Plenipotentiary, Egypt (2011–2013)
  • Assistant Secretary of State for Near Eastern Affairs (2013–2017)
• *Charles N. Patterson Jr. (1943–)
  • Chargé d’Affaires ad interim, Malta (1997)
• *Inmi K. Patterson (?–)
  • Chargé d’Affaires ad interim, Tanzania (2020)
• *Jefferson Patterson (1891–1977)
  • Ambassador Extraordinary and Plenipotentiary, Uruguay (1956–1958)
• Richard Cunningham Patterson Jr. (1896–1966)
  • Ambassador Extraordinary and Plenipotentiary, Yugoslavia (1944–1946)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (1948–1950)
  • Envoy Extraordinary and Minister Plenipotentiary, Switzerland (1951–1953)
• *Robert E. Patterson (1952–)
  • Ambassador Extraordinary and Plenipotentiary, Turkmenistan (2011–2014)
• *Kenneth Stuart Patton (1882–1960)
  • Envoy Extraordinary and Minister Plenipotentiary, New Zealand (1944–1945)
• William Douglas Pawley (1896–1977)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1945–1946)
  • Ambassador Extraordinary and Plenipotentiary, Brazil (1946–1948)
• Harry Franklin Payer (1875–1952)
  • Assistant Secretary of State (1933)
• Charles Payson (?–1913)
  • Third Assistant Secretary of State (1878–1881)
  • Chargé d’Affaires, Denmark (1881–1882)
• Robert Lewis Payton (1926–2011)
  • Ambassador Extraordinary and Plenipotentiary, Cameroon (1967–1969)
• John Lee Peak (1839–1911)
  • Envoy Extraordinary and Minister Plenipotentiary, Switzerland (1895–1897)
• *David D. Pearce (1950–)
  • Ambassador Extraordinary and Plenipotentiary, Algeria (2008–2011)
  • Ambassador Extraordinary and Plenipotentiary, Greece (2013–2016)
• Alfred John Pearson (1869–1939)
  • Envoy Extraordinary and Minister Plenipotentiary, Poland (1924–1925)
  • Envoy Extraordinary and Minister Plenipotentiary, Finland (1925–1930)
• Richmond Pearson (1852–1923)
  • Envoy Extraordinary and Minister Plenipotentiary, Iran (1902–1907)
  • Envoy Extraordinary and Minister Plenipotentiary, Greece (1907–1909)
  • Envoy Extraordinary and Minister Plenipotentiary, Montenegro (1907–1909)
• *W. Robert Pearson (1943–)
  • Executive Secretary (1991–1993)
  • Ambassador Extraordinary and Plenipotentiary, Turkey (2000–2003)
  • Director General of the Foreign Service (2003–2006)
• Amos Jenkins Peaslee II (1887–1969)
  • Ambassador Extraordinary and Plenipotentiary, Australia (1953–1956)
• *Edward Lionel Peck (1929–)
  • Principal Officer, Iraq (1980)
  • Ambassador Extraordinary and Plenipotentiary, Mauritania (1982–1985)
• Henry Everard Peck (1821–1867)
  • Commissioner and Consul General, Haiti (1865–1866)
  • Minister Resident/Consul General, Haiti (1866–1867)
• *Willys Ruggles Peck (1882–1952)
  • Envoy Extraordinary and Minister Plenipotentiary, Thailand (1941)
• James A. Peden (?–)
  • Minister Resident, Argentina (1854–1857)
  • Chargé d’Affaires, Argentina (1854)
  • Minister Resident, Argentina (1856–1858)
  • Envoy Extraordinary and Minister Plenipotentiary, Argentina (1856)
• *Richard Foote Pedersen (1925–)
  • Counselor (1969–1973)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (1973–1975)
• Henry Augustus Peirce (1808–1885)
  • Minister Resident, Hawaii (1869–1877)
• Herbert Henry Davis Peirce (1849–1916)
  • Third Assistant Secretary of State (1901–1906)
  • Envoy Extraordinary and Minister Plenipotentiary, Norway (1906–1911)
• *Mark A. Pekala (1959–)
  • Ambassador Extraordinary and Plenipotentiary, Latvia (2012–2014)
• Herbert Claiborne Pell (1884–1961)
  • Envoy Extraordinary and Minister Plenipotentiary, Portugal (1937–1941)
  • Envoy Extraordinary and Minister Plenipotentiary, Hungary (1941)
• *Michael P. Pelletier (?–)
  • Ambassador Extraordinary and Plenipotentiary, Comoros (2019)
  • Ambassador Extraordinary and Plenipotentiary, Madagascar (2019)
• *Robert Halsey Pelletreau Jr. (1935–)
  • Ambassador Extraordinary and Plenipotentiary, Bahrain (1979–1980)
  • Ambassador Extraordinary and Plenipotentiary, Tunisia (1987–1991)
  • Ambassador Extraordinary and Plenipotentiary, Egypt (1991–1993)
  • Assistant Secretary of State for Near Eastern Affairs (1994–1997)
• *Kenneth Noel Peltier (1944–)
  • Ambassador Extraordinary and Plenipotentiary, Comoros (1990–1993)
• Robert F. Pence (?–)
  • Ambassador Extraordinary and Plenipotentiary, Finland (2018)
• George Hunt Pendleton (1825–1889)
  • Envoy Extraordinary and Minister Plenipotentiary, Germany (1885–1889)
• John Strother Pendleton (1802–1868)
  • Chargé d’Affaires, Chile (1841–1844)
  • Chargé d’Affaires, Argentina (1851–1854)
• *Mary C. Pendleton (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Moldova (1992–1995)
• Frederic Courtland Penfield (1855–1922)
  • Agent/Consul General, Egypt (1893–1897)
  • Ambassador Extraordinary and Plenipotentiary, Austria (1913–1917)
• *James Kedzie Penfield (1908–2004)
  • Ambassador Extraordinary and Plenipotentiary, Iceland (1961–1967)
• *Gary Penner (1949–)
  • Director of the Office of Medical Services (2011–2015)
• *Vernon Dubois Penner Jr. (1939–)
  • Ambassador Extraordinary and Plenipotentiary, Cape Verde (1986–1989)
• *Carol Z. Perez (?–)
  • Ambassador Extraordinary and Plenipotentiary, Chile (2016–2019)
  • Director General of the Foreign Service (2019)
• *Rudolf Vilem Perina (1945–)
  • Chargé d’Affaires ad interim, Socialist Federal Republic of Yugoslavia (1996)
  • Ambassador Extraordinary and Plenipotentiary, Moldova (1998–2001)
• *Edward Joseph Perkins (1928–)
  • Ambassador Extraordinary and Plenipotentiary, Liberia (1985–1986)
  • Ambassador Extraordinary and Plenipotentiary, South Africa (1986–1989)
  • Director General of the Foreign Service (1989–1992)
  • Representative of the U.S.A. to the United Nations (1992–1993)
  • Ambassador Extraordinary and Plenipotentiary, Australia (1993–1996)
• George Walbridge Perkins (1895–1960)
  • Assistant Secretary of State for European and Eurasian Affairs (1949–1953)
  • U.S. Permanent Representative on the Council of the North Atlantic Treaty Organization (1955–1957)
• *Howard T. Perlow (1948–)
  • Chargé d’Affaires ad interim, Madagascar (1998)
• Bill K. Perrin (1938–2005)
  • Ambassador Extraordinary and Plenipotentiary, Cyprus (1988–1989)
• Cynthia Shepart Perry (1928–)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (1986–1989)
  • Ambassador Extraordinary and Plenipotentiary, Burundi (1989–1993)
• *Jack Richard Perry (1930–)
  • Ambassador Extraordinary and Plenipotentiary, Bulgaria (1979–1981)
• *June Carter Perry (1943–)
  • Ambassador Extraordinary and Plenipotentiary, Lesotho (2004–2007)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (2007–2009)
• *Robert Cephas Perry (1946–)
  • Ambassador Extraordinary and Plenipotentiary, Central African Republic (1998–2001)
• *Lauralee M. Peters (1943–2005)
  • Ambassador Extraordinary and Plenipotentiary, Sierra Leone (1992–1995)
• *Mary Ann Peters (1951–)
  • Ambassador Extraordinary and Plenipotentiary, Bangladesh (2000–2003)
• Frederick Valdemar Erastus Peterson (1903–1983)
  • Ambassador Extraordinary and Plenipotentiary, Denmark (1957–1961)
  • Ambassador Extraordinary and Plenipotentiary, Finland (1969–1973)
• *Katherine Hubay Peterson (1949–)
  • Ambassador Extraordinary and Plenipotentiary, Lesotho (1998–2001)
  • Director of the Foreign Service Institute (2001–2005)
  • Ambassador Extraordinary and Plenipotentiary, Botswana (2005–2008)
• *Lisa J. Peterson (1964–)
  • Ambassador Extraordinary and Plenipotentiary, Swaziland (2015)
• Pete (Douglas) Peterson (1935–)
  • Ambassador Extraordinary and Plenipotentiary, Vietnam (1997–2001)
• Joseph Carlton Petrone (1922–)
  • Representative of the U.S.A. to the European Office of the United Nations (Geneva) (1987–1989)
• *Donald K. Petterson (1930–)
  • Ambassador Extraordinary and Plenipotentiary, Somalia (1978–1982)
  • Ambassador Extraordinary and Plenipotentiary, Tanzania (1986–1989)
  • Ambassador Extraordinary and Plenipotentiary, Sudan (1992–1995)
• Solomon Newton Pettis (1827–1900)
  • Minister Resident/Consul General, Bolivia (1878–1879)
• *James D. Pettit (1956–)
  • Ambassador Extraordinary and Plenipotentiary, Moldova (2014–2018)
• *Nancy Bikoff Pettit (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Latvia (2015–2019)
• *John Emil Peurifoy (1907–1955)
  • Assistant Secretary of State for Administration (1947–1950)
  • Deputy Under Secretary of State for Management (1949–1950)
  • Ambassador Extraordinary and Plenipotentiary, Greece (1950–1953)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (1953–1954)
  • Ambassador Extraordinary and Plenipotentiary, Thailand (1954–1955)
• Balie Peyton (1803–1878)
  • Envoy Extraordinary and Minister Plenipotentiary, Chile (1849–1853)
• *Lawrence A. Pezzulo (1926–2017)
  • Ambassador Extraordinary and Plenipotentiary, Uruguay (1977–1979)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (1979–1981)
• *Mary Catherine Phee (1963–)
  • Ambassador Extraordinary and Plenipotentiary, South Sudan (2015–2017)
  • Ambassador Extraordinary and Plenipotentiary, Qatar (Nomination of November 13, 2018 returned by the Senate on January 3, 2019.)
• William Townsend Pheiffer (1898–1986)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1953–1957)
• Edward John Phelps (1822–1900)
  • Envoy Extraordinary and Minister Plenipotentiary, United Kingdom (1885–1889)
• Phelps Phelps (1897–1981)
  • Ambassador Extraordinary and Plenipotentiary, Dominican Republic (1952–1953)
• Seth Ledyard Phelps (1824–1885)
  • Envoy Extraordinary and Minister Plenipotentiary, Peru (1883–1885)
• William Walter Phelps (1839–1894)
  • Envoy Extraordinary and Minister Plenipotentiary, Austria (1881–1882)
  • Envoy Extraordinary and Minister Plenipotentiary, Germany (1889–1893)
• Hoffman Philip (1872–1951)
  • Minister Resident/Consul General, Ethiopia (1908–1910)
  • Envoy Extraordinary and Minister Plenipotentiary, Colombia (1917–1922)
  • Envoy Extraordinary and Minister Plenipotentiary, Uruguay (1922–1925)
  • Envoy Extraordinary and Minister Plenipotentiary, Iran (1925–1928)
  • Envoy Extraordinary and Minister Plenipotentiary, Norway (1930–1935)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1935–1937)
• *Charisse Phillips (?–)
  • Chargé d’Affaires, Bolivia ()
• Christopher H. Phillips (1920–2008)
  • Ambassador Extraordinary and Plenipotentiary, Brunei (1989–1991)
• Earl Norfleet Phillips (1940–)
  • Ambassador Extraordinary and Plenipotentiary, Dominica (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Barbados (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Antigua and Barbuda (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Grenada (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Saint Vincent and the Grenadines (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Saint Lucia (2002–2003)
  • Ambassador Extraordinary and Plenipotentiary, Saint Kitts and Nevis (2002–2003)
• *James Daniel Phillips (1933–2008)
  • Ambassador Extraordinary and Plenipotentiary, Burundi (1986–1990)
  • Ambassador Extraordinary and Plenipotentiary, Congo (Brazzaville) (1990–1993)
• Jean Linden Phillips (1954–)
  • Representative of the U.S.A. to the Organization for Economic Cooperation and Development (Paris) (2001–2003)
• John R. Phillips (1942–)
  • Ambassador Extraordinary and Plenipotentiary, Italy (2013–2017)
  • Ambassador Extraordinary and Plenipotentiary, San Marino (2013–2017)
• Stanley Davis Phillips (1942–)
  • Ambassador Extraordinary and Plenipotentiary, Estonia (2007–2009)
• *William Phillips (1878–1968)
  • Third Assistant Secretary of State (1909)
  • Third Assistant Secretary of State (1914–1917)
  • Assistant Secretary of State (1917–1920)
  • Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1920–1922)
  • Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1920–1922)
  • Under Secretary of State (1922–1924)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1924–1927)
  • Envoy Extraordinary and Minister Plenipotentiary, Luxembourg (1924–1927)
  • Envoy Extraordinary and Minister Plenipotentiary, Canada (1927–1929)
  • Under Secretary of State (1933–1936)
  • Ambassador Extraordinary and Plenipotentiary, Italy (1936–1941)
• Robert H. Phinny (1921–2000)
  • Ambassador Extraordinary and Plenipotentiary, Swaziland (1982–1984)
• Herman Phleger (1890–1984)
  • Legal Adviser (1953–1957)
• Francis Wilkinson Pickens (1805–1869)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1858–1860)
• *Thomas Reeve Pickering (1931–)
  • Executive Secretary (1973–1974)
  • Ambassador Extraordinary and Plenipotentiary, Jordan (1974–1978)
  • Assistant Secretary of State for Oceans and International Environmental and Scientific Affairs (1978–1981)
  • Ambassador Extraordinary and Plenipotentiary, Nigeria (1981–1983)
  • Ambassador Extraordinary and Plenipotentiary, El Salvador (1983–1985)
  • Career Ambassador (1984)
  • Ambassador Extraordinary and Plenipotentiary, Israel (1985–1988)
  • Representative of the U.S.A. to the United Nations (1989–1992)
  • Ambassador Extraordinary and Plenipotentiary, India (1992–1993)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1993–1996)
  • Under Secretary of State for Political Affairs (1997–2000)
• Timothy Pickering (1745–1829)
  • Secretary of State (1795–1800)
  • Secretary of State ad interim (1795)
• James Chamberlayne Pickett (1793–1872)
  • Chargé d’Affaires, Peru (1838–1845)
• Alberto Martinez Piedra (1926–)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (1984–1987)
• Gilbert Ashville Pierce (1841–1901)
  • Minister Resident/Consul General, Portugal (1893)
• *Roger Dwayne Pierce (1951–)
  • Ambassador Extraordinary and Plenipotentiary, Cape Verde (2005–2007)
• Edwards Pierrepont (1817–1892)
  • Envoy Extraordinary and Minister Plenipotentiary, United Kingdom (1876–1877)
• *Steven Karl Pifer (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (1997–2000)
• James Shepard Pike (1811–1882)
  • Minister Resident, Netherlands (1861–1866)
• William Anderson Pile (1829–1889)
  • Minister Resident, Venezuela (1871–1874)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (Not commissioned; nomination first rejected and then tabled by the Senate.)
  • Minister Resident, Venezuela (Not commissioned; nomination withdrawn before the Senate acted upon it.)
• Samuel Henry Piles (1858–1940)
  • Envoy Extraordinary and Minister Plenipotentiary, Colombia (1922–1928)
• Charles J. Pilliod Jr. (1918–2016)
  • Ambassador Extraordinary and Plenipotentiary, Mexico (1986–1989)
• Charles Pinckney (1757–1824)
  • Minister Plenipotentiary, Spain (1801–1804)
• Charles Cotesworth Pinckney (1746–1825)
  • Minister Plenipotentiary, France (1796)
• Thomas Pinckney (1750–1828)
  • Minister Plenipotentiary, United Kingdom (1792–1796)
• Henry Means Pindell (1860–1924)
  • Ambassador Extraordinary and Plenipotentiary, Russia (1914)
• *Lowell Call Pinkerton (1894–1959)
  • Envoy Extraordinary and Minister Plenipotentiary, Lebanon (1946)
  • Envoy Extraordinary and Minister Plenipotentiary, Iraq (1946)
  • Envoy Extraordinary and Minister Plenipotentiary, Lebanon (1947–1951)
  • Ambassador Extraordinary and Plenipotentiary, Sudan (1956–1957)
• William Pinkney (1764–1822)
  • Minister Plenipotentiary, United Kingdom (1808–1811)
  • Envoy Extraordinary and Minister Plenipotentiary, Russia (1816–1818)
• *Larry G. Piper (1928–)
  • Ambassador Extraordinary and Plenipotentiary, The Gambia (1980–1982)
• *Michael T.F. Pistor (1930–2009)
  • Ambassador Extraordinary and Plenipotentiary, Malawi (1991–1994)
• Douglas Alexander Pitkin (?–)
  • Director of the Bureau of Budget and Planning (2015)
• John Robert Graham Pitkin (1841–1901)
  • Envoy Extraordinary and Minister Plenipotentiary, Argentina (1889–1893)
• *H. Dean Pittman (1956–)
  • Ambassador Extraordinary and Plenipotentiary, Mozambique (2015–2018)
• *Joan M. Plaisted (1945–)
  • Ambassador Extraordinary and Plenipotentiary, Kiribati (1995–2000)
  • Ambassador Extraordinary and Plenipotentiary, Marshall Islands (1995–2000)
• *Donald J. Planty (1945–)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (1996–1999)
• *Nicholas Platt (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Zambia (1982–1984)
  • Executive Secretary (1985–1987)
  • Ambassador Extraordinary and Plenipotentiary, Philippines (1987–1991)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (1991–1992)
• *Charles Hutchinson Pletcher (1922–1992)
  • Chargé d’Affaires ad interim, Botswana (1970)
• *Edwin August Plitt (1891–1977)
  • Diplomatic Agent/Consul General, Morocco (1947–1951)
• Walter Christian Ploeser (1907–1993)
  • Ambassador Extraordinary and Plenipotentiary, Paraguay (1957–1959)
  • Ambassador Extraordinary and Plenipotentiary, Costa Rica (1970–1972)
• Yleem D. S. Poblete (?–)
  • Assistant Secretary of State for Arms Control, Verification, and Compliance (2018–2019)
• Miles Poindexter (1868–1946)
  • Ambassador Extraordinary and Plenipotentiary, Peru (1923–1928)
• Joel Roberts Poinsett (1779–1851)
  • Envoy Extraordinary and Minister Plenipotentiary, Mexico (1825–1829)
• *Sol Polansky (1926–2016)
  • Ambassador Extraordinary and Plenipotentiary, Bulgaria (1987–1990)
• *Joan A. Polaschik (1969–)
  • Ambassador Extraordinary and Plenipotentiary, Algeria (2014–2017)
• Frank Lyon Polk (1871–1943)
  • Counselor (1915–1919)
  • Under Secretary of State (1919–1920)
  • Secretary of State ad interim (1920)
• William Hawkins Polk (1815–1862)
  • Chargé d’Affaires, Kingdom of the Two Sicilies (1845–1847)
• Richard Pollard (1790–1851)
  • Chargé d’Affaires, Chile (1834–1842)
  • Chargé d’Affaires, Argentina (Not commissioned; nomination (which had been submitted in error) withdrawn before the Senate acted upon it.)
• *Michael Christian Polt (1954–)
  • Ambassador Extraordinary and Plenipotentiary, Serbia (2004–2007)
  • Ambassador Extraordinary and Plenipotentiary, Estonia (2009–2012)
• George Potwin Pomeroy (1837–1887)
  • Agent/Consul General, Egypt (1882–1884)
• *John M. Pommersheim (?–)
  • Ambassador Extraordinary and Plenipotentiary, Tajikistan (2019)
• Michael R. Pompeo (1963–)
  • Secretary of State (2018–2021)
• *Roman Popadiuk (1950–)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (1992–1993)
• *Laurence Everett Pope II (1945–)
  • Ambassador Extraordinary and Plenipotentiary, Chad (1993–1996)
  • Ambassador Extraordinary and Plenipotentiary, Kuwait (Nomination of February 22, 2000, not acted upon by the Senate.)
• *William W. Popp (?–)
  • Chargé d’Affaires ad interim, Brazil (2018)
  • Ambassador Extraordinary and Plenipotentiary, Guatemala (2020)
• *David Henry Popper (1912–2008)
  • Ambassador Extraordinary and Plenipotentiary, Cyprus (1969–1973)
  • Ambassador Extraordinary and Plenipotentiary, Chile (1973–1977)
  • Assistant Secretary of State for International Organization Affairs (1973–1974)
• Albert Gallatin Porter (1824–1897)
  • Envoy Extraordinary and Minister Plenipotentiary, Italy (1889–1892)
• David Porter (1780–1843)
  • Chargé d’Affaires, Turkey (1831–1840)
  • Minister Resident, Turkey (1839–1843)
• *Dwight Johnson Porter (1916–2006)
  • Assistant Secretary of State for Administration (1963–1965)
  • Ambassador Extraordinary and Plenipotentiary, Lebanon (1965–1970)
• Harry W. Porter III (1939–)
• Horace Porter (1837–1921)
  • Ambassador Extraordinary and Plenipotentiary, France (1897–1905)
• James Davis Porter (1828–1912)
  • Assistant Secretary of State (1885–1887)
  • Envoy Extraordinary and Minister Plenipotentiary, Chile (1893–1894)
• *William James Porter (1914–1988)
  • Ambassador Extraordinary and Plenipotentiary, Algeria (1962–1965)
  • Ambassador Extraordinary and Plenipotentiary, Korea (1967–1971)
  • Under Secretary of State for Political Affairs (1973–1974)
  • Ambassador Extraordinary and Plenipotentiary, Canada (1974–1975)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (1975–1977)
  • Ambassador Extraordinary and Plenipotentiary, Saudi Arabia (Not commissioned; nomination withdrawn before the Senate acted upon it.)
• Michael H. Posner (1950–)
  • Assistant Secretary of State for Democracy, Human Rights, and Labor (2009–2013)
• *Richard St. Francis Post (1929–)
  • Chargé d’Affaires ad interim, Lesotho (1968)
• William Potter (1852–1926)
  • Envoy Extraordinary and Minister Plenipotentiary, Italy (1892–1894)
• *Leon Baqueiro Poullada (1913–1987)
  • Ambassador Extraordinary and Plenipotentiary, Togo (1961–1964)
• Colin Luther Powell (1937–2021)
  • Secretary of State (2001–2005)
• Dina Habib Powell (1973–)
  • Assistant Secretary of State for Educational and Cultural Affairs (2005–2007)
• Herbert Butler Powell (1903–1998)
  • Ambassador Extraordinary and Plenipotentiary, New Zealand (1963–1967)
• *Jo Ellen Powell (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Mauritania (2010–2013)
• *Nancy Jo Powell (1947–)
  • Ambassador Extraordinary and Plenipotentiary, Uganda (1997–1999)
  • Ambassador Extraordinary and Plenipotentiary, Ghana (2001–2002)
  • Ambassador Extraordinary and Plenipotentiary, Pakistan (2002–2004)
  • Ambassador Extraordinary and Plenipotentiary, Nepal (2007–2009)
  • Director General of the Foreign Service (2009–2012)
  • Career Ambassador (2011)
  • Ambassador Extraordinary and Plenipotentiary, India (2012–2014)
• William Frank Powell (1848–1920)
  • Chargé d’Affaires, Dominican Republic (1897–1904)
  • Envoy Extraordinary and Minister Plenipotentiary, Haiti (1897–1905)
• James M. Power (?–)
  • Chargé d’Affaires, Kingdom of the Two Sicilies (1849)
• Samantha Power (1970–)
  • Representative of the U.S.A. to the United Nations (2013–2017)
• *Phyllis Marie Powers (1953–)
  • Ambassador Extraordinary and Plenipotentiary, Panama (2010–2012)
  • Ambassador Extraordinary and Plenipotentiary, Nicaragua (2012–2015)
• Edward C. Prado (?–)
  • Ambassador Extraordinary and Plenipotentiary, Argentina (2018)
• *Peter Alan Prahar (1951–)
  • Ambassador Extraordinary and Plenipotentiary, Micronesia, Federated States of (2009–2012)
• E. Spencer Pratt (?–)
  • Minister Resident/Consul General, Iran (1886–1891)
• William Pitt Preble (1783–1857)
  • Envoy Extraordinary and Minister Plenipotentiary, Netherlands (1829–1831)
• *Henry Precht (1932–)
  • Ambassador Extraordinary and Plenipotentiary, Mauritania (Not commissioned; nomination of July 7, 1980, not acted upon by the Senate.)
• *Ernest Henry Preeg (1934–)
  • Ambassador Extraordinary and Plenipotentiary, Haiti (1981–1983)
• *Joseph A. Presel (1941–)
  • Ambassador Extraordinary and Plenipotentiary, Uzbekistan (1997–2000)
• William Preston (1861–1887)
  • Envoy Extraordinary and Minister Plenipotentiary, Spain (1858–1861)
• John B. Prevost (?–)
  • Chargé d’Affaires, Peru (Not commissioned; nomination withdrawn before the Senate acted upon it.)
• Charles H. Price II (1931–2012)
  • Ambassador Extraordinary and Plenipotentiary, Belgium (1981–1983)
  • Ambassador Extraordinary and Plenipotentiary, United Kingdom (1983–1989)
• John Price (1933–)
  • Ambassador Extraordinary and Plenipotentiary, Comoros (2002–2005)
  • Ambassador Extraordinary and Plenipotentiary, Seychelles (2002–2005)
  • Ambassador Extraordinary and Plenipotentiary, Mauritius (2002–2005)
• *Thomas L. Price (?–)
  • Chargé d’Affaires, Armenia (1993)
• William Jennings Price (1873–1952)
  • Envoy Extraordinary and Minister Plenipotentiary, Panama (1913–1921)
• John Dyneley Prince (1868–1945)
  • Envoy Extraordinary and Minister Plenipotentiary, Denmark (1921–1926)
  • Envoy Extraordinary and Minister Plenipotentiary, Yugoslavia (1926–1932)
• *Robert Maxwell Pringle (1936–)
  • Ambassador Extraordinary and Plenipotentiary, Mali (1987–1990)
• John Charles Pritzlaff Jr. (1925–2005)
  • Ambassador Extraordinary and Plenipotentiary, Malta (1969–1972)
• Herbert Victor Prochnow (1897–1998)
  • Deputy Under Secretary of State for Economic Affairs (1955–1956)
• George H. Proffit (1807–1847)
  • Envoy Extraordinary and Minister Plenipotentiary, Brazil (1843–1844)
• Kathryn Linda Haycock Proffitt (1951–)
  • Ambassador Extraordinary and Plenipotentiary, Malta (1997–2001)
• Pierre-Richard Prosper (1963–)
  • Ambassador at Large (2001–2005)
• Joseph W. Prueher (1942–)
  • Ambassador Extraordinary and Plenipotentiary, China (1999–2001)
• Robert Hewson Pruyn (1815–1882)
  • Minister Resident, Japan (1861–1865)
• *William T. Pryce (1932–2006)
  • Ambassador Extraordinary and Plenipotentiary, Honduras (1993–1996)
• *Robert Lee Pugh (1931–2013)
  • Ambassador Extraordinary and Plenipotentiary, Mauritania (1985–1988)
  • Ambassador Extraordinary and Plenipotentiary, Chad (1988–1989)
• *Alfred Puhan (1913–2005)
  • Ambassador Extraordinary and Plenipotentiary, Hungary (1969–1973)
• James Nelson Purcell Jr. (1938–)
  • Assistant Secretary of State for Population, Refugees, and Migration Affairs (1983–1986)
• *Jon Robert Purnell (1948–)
  • Ambassador Extraordinary and Plenipotentiary, Uzbekistan (2003–2007)
• James Osborne Putnam (1818–1903)
  • Minister Resident, Belgium (1880–1882)
• *Geoffrey R. Pyatt (1963–)
  • Ambassador Extraordinary and Plenipotentiary, Ukraine (2013–2016)
  • Ambassador Extraordinary and Plenipotentiary, Greece (2016)