Oliver Patton Echols (March 4, 1892 – May 15, 1954) was an American military officer who brought success in World War II to the United States Army Air Forces by expanding the inventory of America's air arm to meet the needs of the coming war. More than any other man under Chief of the Army Air Forces, General Henry H. Arnold, Echols was responsible for the development, procurement and supply of aircraft and aeronautical equipment. Fighter projects officer Benjamin S. Kelsey, directly subordinate to Echols from 1934 to 1945, called him "The Man Who Won World War II."