Frederick James Clarke (March 1, 1915– February 4, 2002) was a civil and military engineer with the United States Army Corps of Engineers. Clarke was one of three commissioners appointed to run the District of Columbia from 1960 to 1963, and later rose to the rank of Chief of Engineers in the Corps of Engineers. As the war in Europe ended, he was involved in the frenzied planning effort to redirect supplies to the Pacific. Clarke also worked in the atomic energy field for the Manhattan Engineer District (best known as the Manhattan Project).