The Eclipse Award for Champion Older Dirt Female Horse is an American Thoroughbred horse racing honor awarded annually to a filly or mare, four years old and up, for performances on dirt and main track racing surfaces.
In 1936 both the Turf & Sports Digest magazine and Daily Racing Form (DRF) began naming an annual champion.
Starting in 1950, the Thoroughbred Racing Associations (TRA) began naming its own champion.
The Daily Racing Form version was open to any female horse, and was given to some Champions at the age of three, such as Tosmah, Twilight Tear and Busher.
Champions from 1887 through 1935 were selected retrospectively by a panel of experts as published by The Blood-Horse magazine.