Leslie Harvey Fleming (August 7, 1915 – March 5, 1980) was an American professional baseball first baseman whose 20-year career included all or parts of seven seasons in Major League Baseball as a member of the Detroit Tigers (1939), Cleveland Indians (1941–1942 and 1945–1947), and Pittsburgh Pirates (1949). Born in Singleton, a small community in Grimes County, Texas, he stood 5 feet 10 inches (1.78 m) tall, weighed 185 pounds (84 kg), and threw and batted left-handed.