Robert Julian Frankel (July 9, 1941 – November 16, 2009) was an American thoroughbred race horse trainer whom ESPN called "one of the most successful and respected trainers in the history of thoroughbred racing." He was inducted into the National Museum of Racing and Hall of Fame in 1995, and was a five-time winner of the Eclipse Award for Outstanding Trainer. Often referred to as "Bobby" by others, he preferred and always used "Robert". Frankel set the single-season world record for most Grade/Group I victories in 2003 with 25 Grade I wins, a record that stood until it was beaten by Aidan O'Brien in 2017.