Sefton (1875–1891) was a British Thoroughbred racehorse and sire. In a career that lasted from 1877 to 1878 he ran thirteen times and won three races. He showed little promise as a two-year-old, but developed into a leading colt the following year, when his wins included the 1878 Epsom Derby. At the end of the season he was retired to stud where he had little success. He was put down in 1891. The famous "Sefton Lodge" stables in Newmarket, owned by the horse's owner, were named after him.