The Prix Marcel Boussac is a Group 1 flat horse race in France open to two-year-old thoroughbred fillies.
It is run at Longchamp over a distance of 1,600 metres (about 1 mile), and it is scheduled to take place each year in early October.
The best two-year-old fillies had previously competed against male horses in the Grand Critérium.
Boussac was a highly successful owner/breeder, and he served as chairman of the sport's former governing body in France, the Société d'Encouragement.
The Prix Marcel Boussac took place on Longchamp's middle course (moyenne piste) until 1986.