Australia is an Irish-bred, Thoroughbred racehorse best known for winning the 2014 Epsom Derby. As a two-year-old in 2013, he won two of his three races, creating a very favourable impression when winning the Breeders' Cup Juvenile Turf Trial Stakes, and was highly regarded by his trainer Aidan O'Brien. In May 2014 he finished third behind Night of Thunder and Kingman in the 2000 Guineas before winning the Epsom Derby on 7 June. He subsequently won the Irish Derby and International Stakes before being defeated by The Grey Gatsby in the Irish Champion Stakes. His racing career was ended by injury in October 2014. He is standing at Coolmore stud.

Aidan Patrick O'Brien is an Irish horse racing trainer. Since 1996, he has been the private trainer at Ballydoyle Stables near Rosegreen in County Tipperary for John Magnier and his Coolmore Stud associates. He is widely acknowledged as one of the greatest horse racing trainers of all time.