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.

The 2014 Epsom Derby was the 235th annual running of the Derby horse race which took place at Epsom Downs Racecourse on 7 June 2014. The race was won by the favourite, Australia, a British-bred chestnut, trained in Ireland by Aidan O'Brien and ridden by O'Brien's son Joseph. Australia's victory gave Aidan O'Brien his third consecutive victory in the race, and his fifth in all, after Galileo (2001), High Chaparral (2002), Camelot (2012) and Ruler of the World (2013).