The American Champion Two-Year-Old Filly is an American Thoroughbred horse racing honor awarded annually to a female horse in Thoroughbred flat racing. It became part of the Eclipse Awards program in 1971. The Daily Racing Form, the Thoroughbred Racing Associations, and the National Turf Writers Association all joined forces in 1971 to create the Eclipse Award. In 1978, the voting resulted in a tie between two fillies. Champions prior to 1936 were selected retrospectively by a panel of experts as published by The Blood-Horse magazine. These awards included several joint-winners.