Philip Thomas Reeker (born January 19, 1965) is an American diplomat and career foreign service officer with the Department of State who currently serves as the senior advisor for Caucasus negotiations. He was previously Chargé d'affaires of the United States mission to the United Kingdom from 2021 to 2022 and acting assistant secretary of state in the Bureau of European and Eurasian Affairs from 2019 to 2021.