Marcel Boussac (17 April 1889 – 21 March 1980) was a French entrepreneur best known for his ownership of the Maison Dior and one of the most successful thoroughbred race horse breeding farms in European history.
An avid horseman, Marcel Boussac acquired the Haras de Fresnay-le-Buffard horse breeding farm in Neuvy-au-Houlme in Lower Normandy and the Haras de Jardy in Marnes-la-Coquette. As part of his breeding operation, Boussac bought and sold horses from across Europe plus from the United States. He acquired the U.S. Triple Crown winner Whirlaway and sold the mare La Troienne to Edward R. Bradley's Idle Hour Stock Farm in Lexington, Kentucky who became one of the most influential mares to be imported into the U.S. in the 20th century.
Boussac's horses, carrying Boussac's signature orange silk and grey cap, dominated French horse racing from the 1930s through to the 1960s making his stable the leading money winner fourteen times and the leading breeder on seventeen occasions. In addition to being a six-time winner of France's most important race, the Prix de l'Arc de Triomphe, Boussac's horses also won the prestigious Epsom Derby, Epsom Oaks, 2,000 Guineas, St. Leger Stakes, Ascot Gold Cup and others in the United Kingdom.
In his honour, the Prix Marcel Boussac, a Group One Stakes Race, is run annually at the Longchamp Racecourse.