Ballydoyle is a racehorse training facility located in County Tipperary in Ireland. It is a sister thoroughbred facility to Coolmore Stud, and both are owned by John Magnier. The current trainer at Ballydoyle is Aidan O'Brien, who succeeded Vincent O'Brien (no relation) in 1995. Coordinates: 52°27′40″N 7°49′38″W / 52.46111°N 7.82722°W
After the 1951 Cheltenham Festival, Vincent O'Brien moved into Ballydoyle, then a 285-acre (1.15 km2) farm ringed by mountains near the village of Rosegreen, County Tipperary.
The stables are renowned for their exceptionally high attention to detail and world class facilities used in the preparation of Horses throughout their racing career at Ballydoyle. The primary gallop at Ballydoyle is said to be based on the turns and undulations of Epsom Downs Racecourse, perhaps with the intention of giving Ballydoyle trained runners a key advantage in a race in which many future Coolmore Stud stallions are made.
O'Brien trained such household names as Nijinsky and Sadler's Wells at Ballydoyle. There is a bronze statue of Nijinsky at the stables.
Aidan O'Brien has measured up to those high standards by training many top class horses, such as Rock of Gibraltar, Galileo, High Chaparral and George Washington.