| William W. Popp | |
| Ambassador From: | United States |
| Country: | Uganda |
| President: | Joe Biden |
| Term Start: | September 20, 2023 |
| Predecessor: | Natalie E. Brown |
| Ambassador From1: | United States |
| Country1: | Guatemala |
| President1: | Donald Trump Joe Biden |
| Term Start1: | October 19, 2020 |
| Term End1: | August 24, 2023 |
| Predecessor1: | Luis E. Arreaga |
| Successor1: | Patrick Ventrell (acting) |
| Ambassador From2: | United States |
| Country2: | Brazil |
| President2: | Donald Trump |
| Term Start2: | November 5, 2018 |
| Term End2: | March 30, 2020 as Chargé d’Affaires ad interim |
| Predecessor2: | P. Michael McKinley |
| Successor2: | Todd C. Chapman |
| Birth Name: | William Wayne Popp[1] |
| Nationality: | American |
| Nickname: | Bill |
| Education: | Westminster College (B.A.) George Washington University (M.A.) National War College (M.S.) |
William W. Popp is an American diplomat serving as the United States ambassador to Uganda since September 2023. He previously served as the United States ambassador to Guatemala.[2]
Popp earned his Bachelor of Arts, magna cum laude,[3] from Westminster College, his Master of Arts from George Washington University, and his Master of Science in National Security Strategy at the National War College.[4]
Popp was the Deputy Principal Officer and then Acting Principal Officer at the United States Consulate General in Sao Paulo, Brazil. He also served as the Deputy Economic Counselor of the United States Embassy in Bogota, Colombia. He served as the Political Counselor and then as the Acting Deputy Chief of Mission at the United States Embassy in Nairobi, Kenya. He was also the Director of the Office of Regional Economic Policy and Summit Coordination in the Bureau of Western Hemisphere Affairs at the State Department. He was the Chargé d'Affaires a.i. in Brazil from November 2018 to February 2020. He has been the Deputy Chief of Mission at the U.S. Embassy in Brasilia, Brazil since August 2017.
On May 28, 2020, President Trump announced his intent to nominate Popp to be the next United States Ambassador to Guatemala. On June 2, 2020, his nomination was sent to the United States Senate.[5] He was confirmed by the U.S. Senate on August 6, 2020 by voice vote. He was sworn into office on August 13, 2020.[6] Popp presented his credentials to Guatemalan President Alejandro Giammattei on October 19, 2020.[7]
On February 27, 2023, President Joe Biden nominated Popp to be the next ambassador to Uganda.[8] Hearings on his nomination were held before the Senate Foreign Relations Committee on May 16, 2023. The committee favorably reported the nomination on June 1, 2023. It was confirmed by the full Senate on July 27, 2023 via voice vote.[9] Popp presented his credentials to President Yoweri Museveni on September 20, 2023.[10]
Popp speaks Spanish and Portuguese.