Samuel Reber III (July 15, 1903 – December 25, 1971) was a diplomat who spent 27 years in the Foreign Service of the United States, including several years with the Allied High Commission for Germany. Threats by Senator Joseph McCarthy to reveal a homosexual incident in his past forced him to resign quietly from the State Department in 1953. McCarthy later publicly alleged that Reber had been forced to retire because he posed a "security risk."