Ayrshire (1885–1910) was a British Thoroughbred racehorse and sire. In a career that lasted from 1887 to 1889 he ran sixteen times and won eleven races. After winning five races as a two-year-old he became the leading British three-year-old colt of 1888 when he won the 2000 Guineas at Newmarket and the Derby at Epsom. He failed in his bid to win the English Triple Crown when beaten in the St Leger at Doncaster but returned in 1889 for a successful campaign which included a win in the Eclipse Stakes at Sandown. He was retired to stud at the end of the year and had a modestly successful career as a stallion. He died in 1910.