Angel A. Penna Sr. (September 30, 1923 –January 15, 1992) was an Argentine-born U. S. Racing Hall of Fame Thoroughbred horse trainer. Penna was an international trainer who worked and raced on three continents. He conditioned more than 250 graded stakes race winners during a career that began in 1950 and lasted for more than forty years. Born in Buenos Aires to a racing family, Angel Penna's father, father-in-law, and an uncle were all horse trainers. Angel Penna worked as an assistant to his father until going out on his own in 1942.