The Jockey Club is the breed registry for all Thoroughbred horses in North America. As such, it is responsible for maintaining The American Stud Book, which includes all Thoroughbreds foaled in the United States, Canada and Puerto Rico as well as Thoroughbreds imported into those countries from nations around the world that maintain similar Thoroughbred registries.

The Jockey Club was formed on February 9, 1894, in New York City by several prominent Thoroughbred owners and breeders determined to bring a sense of order and authority to an increasingly chaotic sport.

The Jockey Club, then and now, is dedicated to the improvement of Thoroughbred breeding and racing and it maintains a leadership role in numerous industry initiatives, including the National Thoroughbred Racing Association (NTRA).

Through the years, several subsidiary companies, charitable foundations and a general partnership have been created for the betterment of the industry and they now make up The Jockey Club family of companies.

The Jockey Club maintains offices in Lexington, Kentucky, and New York City.