The Irish Sport Horse, also known as the Irish Hunter or Irish Draught Sport Horse, represents Ireland's most successful contribution to international equestrian sport. This breed emerged from centuries of selective crossbreeding between the powerful Irish Draught and the athletic Thoroughbred, creating a versatile competition horse that excels at the highest levels of eventing and show jumping.
Horse Sport Ireland maintains the official Irish Sport Horse Studbook, which operates under the authority of the Department of Agriculture, Food and the Marine. The registry recognizes several categories of Irish Sport Horses based on their bloodlines and breeding. Traditional Irish Horses, designated as TIH in the registry, contain only Irish Sport Horse, Irish Draught, Thoroughbred, and Connemara Pony in their pedigrees, representing the original foundation of the breed.
Historically, Irish hunters were classified by weight categories based on their Thoroughbred percentage. Heavyweight hunters contained up to twenty-five percent Thoroughbred blood, mediumweight hunters up to fifty percent, and lightweight hunters up to seventy-five percent. This classification system reflected the breed's versatility and the ability to produce horses suited to different purposes and rider requirements.
International registries for the Irish Sport Horse exist in North America, Australia, and other countries, each maintaining standards that reflect the original Irish breeding goals. The Irish Draught Horse Society of North America and similar organizations work to preserve and promote both purebred Irish Draughts and their sport horse crosses.

