West Australian (1850–1870) was a British Thoroughbred racehorse and sire. In a racing career which lasted from October 1852 until June 1854 he ran ten times and won nine races. After being beaten on his debut, he won all his remaining starts including the 2000 Guineas, The Derby the St Leger and the Ascot Gold Cup. He has been retrospectively recognised as the first Triple Crown winner. West Australian was regarded by contemporary experts as one of the best British horses of the nineteenth century. After his retirement from racing he had some success as a sire of winners in England and France and was largely responsible for the survival of the Godolphin Arabian sire-line.

The 2000 Guineas Stakes is a Group 1 flat race in Great Britain open to three-year-old thoroughbred colts and fillies. It is run on the Rowley Mile at Newmarket over a distance of 1 mile (1.6 km) and scheduled to take place each year at the start of May.