This is a list of ambassadors of the United States to Thailand.
Thailand has had continuous bilateral relations with the United States since 1882. Relations were interrupted during World War II when Bangkok was occupied by Japanese forces. Normal relations were resumed after the war in 1945.
The United States Embassy to Thailand, which was designed by Gerhard Kallmann of Kallmann McKinnell & Wood, is located in Bangkok.
Ambassadors NamePortraitCareer statusTitleAppointedPresentation of credentialsTermination of missionCommentJohn A. Halderman Jr.Minister Resident/Consul GeneralJuly 13, 1882 October 23, 1882 Left post April 1, 1885Jacob T. ChildMinister Resident/Consul GeneralMarch 9, 1886 June 5, 1886 Presented recall, January 17, 1891Note: President Harrison nominated Alexander C. Moore for the ministerial post on July 9, 1890, but Moore declined the appointment.Sempronius H. BoydMinister Resident/Consul GeneralOctober 1, 1890 January 17, 1891 Relinquished charge, June 13, 1892John BarrettMinister Resident/Consul GeneralFebruary 14, 1894 November 15, 1894 Presented recall, April 26, 1898Hamilton KingMinister Resident/Consul GeneralJanuary 14, 1898 April 26, 1898 April 27, 1903Hamilton KingEnvoy Extraordinary and Minister PlenipotentiaryApril 27, 1903 July 3, 1903 Died at post September 2, 1912Fred W. CarpenterPolitical appointeeEnvoy Extraordinary and Minister PlenipotentiarySeptember 12, 1912 January 22, 1913 Left post November 16, 1913President Wilson nominated Alexander Sweek of Oregon for the post in 1913 but Sweek’s nomination was not confirmed by the United States Senate.William H. Hornibrook Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryFebruary 12, 1915 May 31, 1915 Presented recall, October 24, 1916George Pratt Ingersoll Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryAugust 8, 1917 November 24, 1917 Left post June 23, 1918George W. P. Hunt Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryMay 18, 1920 September 6, 1920 Left post October 1, 1921Edward E. Brodie Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryOctober 8, 1921 January 31, 1922 Left post May 2, 1925William W. RussellCareer FSOEnvoy Extraordinary and Minister PlenipotentiarySeptember 28, 1925 January 9, 1926 Left post January 7, 1927Harold Orville MacKenzie Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryMarch 3, 1927 June 28, 1927 Left post March 29, 1930Arthur H. Geissler Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryDecember 16, 1929 — —David E. Kaufman Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryJune 12, 1930 December 9, 1930 Left post June 15, 1933James Marion BakerPolitical appointeeEnvoy Extraordinary and Minister PlenipotentiaryAugust 30, 1933 December 9, 1933 Left post May 2, 1936Edwin L. Neville Career FSOEnvoy Extraordinary and Minister PlenipotentiaryMay 28, 1937 October 2, 1937 Left post May 1, 1940Note: Siam changed its name to Thailand in 1939, but ambassadors were commissioned to Siam until 1954.Hugh Gladney Grant Political appointeeEnvoy Extraordinary and Minister PlenipotentiaryApril 3, 1940 August 20, 1940 Left post August 30, 1941Willys R. Peck Career FSOEnvoy Extraordinary and Minister PlenipotentiaryAugust 19, 1941 September 16, 1941 Japanese forces occupied Bangkok, December 8, 1941Note: Thailand declared war on the United States January 25, 1942. Ambassador Peck was initially interned and then freed. He departed Thailand on June 29, 1942. Note: Normal relations between Thailand and the United States were resumed after the war in October 1945.Charles W. Yost Career FSOChargé d’AffairesNot commissioned A letter of credence was sent to Yost by telegram, October 16, 1945. Superseded by commissioned envoy July 4, 1946Edwin F. Stanton Career FSOEnvoy Extraordinary and Minister PlenipotentiaryApril 27, 1946 July 4, 1946 Promoted to Ambassador Extraordinary and Plenipotentiary April 10, 1947.Note: The legation in Bangkok was raised to embassy status March 18, 1947. At the same time the envoy was promoted to ambassador.Edwin F. StantonCareer FSOAmbassador Extraordinary and PlenipotentiaryApril 10, 1947 May 9, 1947 Left post June 30, 1953Note: Hereafter ambassadors were commissioned to Thailand rather than Siam, as previous envoys had been.William J. Donovan Political appointeeAmbassador Extraordinary and PlenipotentiaryAugust 3, 1953 September 4, 1953 Left post August 21, 1954John PeurifoyCareer FSOAmbassador Extraordinary and PlenipotentiarySeptember 15, 1954 December 3, 1954 Died near Hua Hin, August 12, 1955Max Waldo Bishop Career FSOAmbassador Extraordinary and PlenipotentiaryDecember 3, 1955 January 9, 1956 Left post January 6, 1958U. Alexis JohnsonCareer FSOAmbassador Extraordinary and PlenipotentiaryJanuary 30, 1958 February 14, 1958 Left post April 10, 1961Kenneth Todd Young Political appointeeAmbassador Extraordinary and PlenipotentiaryMarch 29, 1961 June 22, 1961 Left post August 19, 1963Graham A. Martin Career FSOAmbassador Extraordinary and PlenipotentiarySeptember 10, 1963 November 7, 1963 Left post September 9, 1967Leonard S. Unger Career FSOAmbassador Extraordinary and PlenipotentiaryAugust 11, 1967 October 4, 1967 Left post November 19, 1973William R. Kintner Political appointeeAmbassador Extraordinary and PlenipotentiarySeptember 28, 1973 November 29, 1973 Left post March 15, 1975Charles S. Whitehouse Career FSOAmbassador Extraordinary and PlenipotentiaryMay 8, 1975 May 30, 1975 Left post June 19, 1978Morton I. Abramowitz Career FSOAmbassador Extraordinary and PlenipotentiaryJune 27, 1978 August 9, 1978 Left post July 31, 1981John Gunther Dean Career FSOAmbassador Extraordinary and PlenipotentiaryOctober 1, 1981 October 26, 1981 Left post June 6, 1985William Andreas Brown Career FSOAmbassador Extraordinary and PlenipotentiaryJune 6, 1985 July 5, 1985 Left post August 5, 1988Daniel Anthony O'Donohue Career FSOAmbassador Extraordinary and PlenipotentiaryJuly 11, 1988 August 13, 1988 Left post August 10, 1991David Floyd Lambertson Career FSOAmbassador Extraordinary and PlenipotentiaryJuly 22, 1991 September 24, 1991 Left post August 25, 1995William H. Itoh Career FSOAmbassador Extraordinary and PlenipotentiaryDecember 19, 1995 February 20, 1996 Left post February 1, 1999Richard E. Hecklinger Career FSOAmbassador Extraordinary and PlenipotentiaryDecember 1, 1998 March 9, 1999 Left post December 21, 2001Darryl N. Johnson Career FSOAmbassador Extraordinary and PlenipotentiaryNovember 26, 2001 March 29, 2002 Left post December 28, 2004Ralph Leo BoyceCareer FSOAmbassador Extraordinary and PlenipotentiaryJuly 2, 2004 March 9, 2005 Left post July 21, 2007Eric G. JohnCareer FSOAmbassador Extraordinary and PlenipotentiaryAugust 3, 2007 January 8, 2008 Left post September 30, 2010Kristie A. KenneyCareer FSOAmbassador Extraordinary and PlenipotentiaryDecember 9, 2010 January 8, 2011 Left post November 6, 2014Glyn T. DaviesCareer FSOAmbassador Extraordinary and Plenipotentiary August 6, 2015 September 22, 2015 Left post September 29, 2018Michael G. DeSombrePolitical appointeeAmbassador Extraordinary and PlenipotentiaryJanuary 8, 2020March 2, 2020January 20, 2021Robert F. GodecCareer FSOAmbassador Extraordinary and PlenipotentiaryAugust 4, 2022October 7, 2022December 1, 2025Sean O'NeillCareer FSOAmbassador Extraordinary and PlenipotentiaryOctober 7, 2025February 11, 2026Incumbent
See also Thailand – United States relations Foreign relations of Thailand Ambassadors of the United States Embassy of the United States, Bangkok
Notes
References
Sources United States Department of State: Background notes on Thailand
External links United States Department of State: Chiefs of Mission for Thailand United States Department of State: Thailand United States Embassy in Bangkok