Elmer Ray Riddle (July 31, 1914 – May 14, 1984) was an American professional baseball player. A right-handed pitcher, he appeared in all or parts of ten Major League Baseball (MLB) seasons (1939–45; 1947–49) for the Cincinnati Reds and Pittsburgh Pirates. As a member of the 1941 Reds, he led the National League (NL) in winning percentage (19–4, .826) and earned run average (ERA) (2.24). Two years later, he tied for the NL and MLB lead in games won, with 21. Riddle died in his hometown, Columbus, at the age of 69.