William W. Popp is an American diplomat serving as the United States ambassador to Uganda since September 2023.

[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.

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.

[3] On May 28, 2020, President Donald Trump announced his intent to nominate Popp to be the next United States Ambassador to Guatemala.