Robert Sterling "Ducky" Detweiler (February 15, 1919 – March 13, 2013) was an American professional baseball infielder and manager. Listed at 5 feet 11 inches (1.80 m) tall and 178 pounds (81 kg), he batted and threw right handed. Born in Trumbauersville, Pennsylvania, Detweiler was one of many promising young ballplayers whose careers were interrupted by military service during World War II.