| Post: | Ambassador |
| Body: | the United States to Sierra Leone |
| Insignia: | US Department of State official seal.svg |
| Insigniasize: | 120 |
| Insigniacaption: | Seal of the United States Department of State |
| Incumbent: | Bryan David Hunt |
| Incumbentsince: | September 11, 2023[1] |
| Nominator: | The President of the United States |
| Inaugural: | Herbert Reiner as Chargé d'Affaires ad interim |
| Formation: | April 27, 1961 |
| Website: | U.S. Embassy - Freetown |
The United States ambassador to Sierra Leone is the official representative of the government of the United States to the government of Sierra Leone.
| Herbert Reiner – Career FSO | Chargé d'Affaires ad interim | April 27, 1961 | N/A | 1961 | |
| A. S. J. Carnahan – Political appointee | Ambassador Extraordinary and Plenipotentiary | May 11, 1961 | June 9, 1961 | July 13, 1963 | |
| Andrew V. Corry - Career FSO | January 29, 1964 | February 25, 1964 | May 19, 1967 | ||
| Robert Graham Miner - Career FSO | November 7, 1967 | December 7, 1967 | June 16, 1971 | ||
| Clinton Louis Olson[2] - Career FSO | June 27, 1972 | July 4, 1972 | November 11, 1974 | ||
| Michael Anthony Samuels - Political appointee | December 20, 1974 | February 14, 1975 | May 25, 1977 | ||
| John Andrew Linehan - Career FSO[3] | June 24, 1977 | August 30, 1977 | May 9, 1980 | ||
| Theresa Ann Healy - Career FSO | August 27, 1980 | September 18, 1980 | July 13, 1983 | ||
| Arthur Winston Lewis - Career FSO[4] | May 17, 1983 | August 17, 1983 | June 5, 1986 | ||
| Cynthia Shepard Perry - Political appointee | June 16, 1986 | July 16, 1986 | August 30, 1989 | ||
| Johnny Young – Career FSO | October 10, 1989 | November 29, 1989 | July 23, 1992 | ||
| Lauralee M. Peters - Career FSO | June 15, 1992 | October 8, 1992 | July 6, 1995 | ||
| John Lewis Hirsch - Career FSO | August 14, 1995 | September 13, 1995 | June 17, 1998 | ||
| Joseph Melrose - Career FSO | October 22, 1998 | November 20, 1998 | September 10, 2001 | ||
| Peter R. Chaveas - Career FSO | July 12, 2001 | October 12, 2001 | May 24, 2004 | ||
| Thomas Neil Hull[5] - Career FSO | May 12, 2004 | August 19, 2004 | August 27, 2007 | ||
| June Carter Perry - Career FSO | July 7, 2007 | October 8, 2007 | January 2, 2009 | ||
| Michael S. Owen – Career FSO | August 9, 2010 | September 30, 2010 | October 2, 2013 | ||
| John Hoover - Career FSO | September 12, 2014 | December 4, 2014 | July 2, 2017 | ||
| Maria Brewer - Career FSO | August 3, 2017 | October 5, 2017 | February 22, 2021 | ||
| David Dale Reimer - Career FSO | December 22, 2020 | March 24, 2021 | August 24, 2023 | ||
| Bryan David Hunt - Career FSO | July 27, 2023 | September 11, 2023 | Incumbent |