The present country of Tanzania, officially the United Republic of Tanzania, was created upon the union of the formerly independent countries of Tanganyika and the People's Republic of Zanzibar (PRZ).

Tanganyika became independent from the United Kingdom (UK) on December 9, 1961. The United States (US) immediately recognized the new nation and moved to establish diplomatic relations. The US embassy in Dar es Salaam opened on the day of Tanganyika's independence. William R. Duggan served as the chargé d'affaires ad interim pending the appointment of an ambassador.

The Sultanate of Zanzibar became independent from the UK on December 19, 1963, as a constitutional monarchy headed by its sultan. The US established an embassy in Zanzibar on December 10, 1963, with Frederick P. Picard III serving as chargé d'affaires ad interim. In January 1964, the sultan was overthrown and the PRZ was established.

On April 26, 1964, Tanganyika united with the PRZ to form the United Republic of Tanganyika and Zanzibar (U.R.T.Z.). The US ambassador to Tanganyika, William K. Leonhart, immediately became the ambassador to the URTZ. A US ambassador to the PRZ had not yet been appointed when that country united with Tanganyika. In lieu of an ambassador, Frank C. Carlucci III was serving as the chargé d'affaires ad interim and continued in that capacity until the US embassy was downgraded to a consulate general on June 27, 1964.

The country was renamed the United Republic of Tanzania on October 29, 1964.

The US did not have an ambassador to Tanzania from October 2016 to August 2020.

Ambassadors

Name and statusTitleAppointedPresented credentialsTerminated missionNotesWilliam K. Leonhart – Career FSOAmbassador Extraordinaryand PlenipotentiaryAugust 22, 1962October 3, 1962December 22, 1965Leonhart was originally commissioned to Tanganyika. He was recommissioned when Tanganyika became a republic and presented new credentials on December 17, 1962. Leonhart continued to serve without further reaccreditation after the formation of the United Republic of Tanganyika and ZanzibarJohn H. Burns – Career FSOSeptember 24, 1965January 3, 1966June 22, 1969Claude G. Ross – Career FSOOctober 9, 1969December 27, 1969June 25, 1972W. Beverly Carter, Jr. – Career FSOJune 27, 1972July 24, 1972October 14, 1975James W. Spain – Career FSONovember 20, 1975January 8, 1976August 21, 1979Richard Noyes Viets – Career FSOSeptember 28, 1979October 18, 1979May 16, 1981David Charles Miller, Jr. – Political appointeeOctober 26, 1981November 4, 1981February 28, 1984John William Shirley – Career FSOJune 28, 1984July 28, 1984July 18, 1986Donald K. Petterson – Career FSOOctober 16, 1986December 8, 1986December 26, 1989Edmund DeJarnette, Jr. – Career FSONovember 21, 1989February 26, 1990September 12, 1992Peter Jon de Vos – Career FSOJune 15, 1992January 8, 1993June 3, 1994J. Brady Anderson – Political appointeeAugust 26, 1994September 13, 1994October 7, 1997Charles Richard Stith – Political appointeeJune 29, 1998September 17, 1998January 20, 2001Robert V. Royall – Political appointeeNovember 5, 2001December 19, 2001 November 21, 2003The post was vacant from November 2003 until August 2005. Michael S. Owen served as chargé d'affaires ad interim during that time.Michael Retzer – Political appointeeAugust 24, 2005March 9, 2005August 31, 2007Mark Andrew Green – Political appointeeAugust 23, 2007September 13, 2007January 20, 2009Alfonso Lenhardt – Political appointeeNovember 12, 2009November 12, 2009October 9, 2013Mark B. Childress – Political appointeeApril 7, 2014May 22, 2014October 25, 2016Donald J. Wright – Political appointeeFebruary 14, 2020August 2, 2020January 11, 2023Michael Battle - Political appointeeDecember 13, 2022February 27, 2023January 15, 2025Andrew Lentz - Career FSOChargé d'affaires ad interimJanuary 15, 2025Incumbent

See also Tanzania–United States relations Foreign relations of Tanzania Ambassadors of the United States

Notes

References United States Department of State: Background notes on Tanzania

External links "Chiefs of Mission for Tanzania", Office of the Historian, United States Department of State "Tanzania", Bureau of African Affairs, United States Department of State US Embassy in Tanzania