The Lambkin (1881 – May 1900) was a British Thoroughbred racehorse and sire. He showed moderate ability as a two-year-old in 1883 when he won one minor race from two starts. In the following year he was well beaten on his debut but then won the Esher Stakes before finishing second when matched against top-class French opposition in the Grand Prix de Paris. At Doncaster Racecourse in September he was able to exploit his superior fitness to record his biggest success in the St Leger, beating the winner of that year's 2000 Guineas and Epsom Derby. In two subsequent races he finished second in the Doncaster Cup and came home unplaced in the Cesarewitch. As a breeding stallion he had no success as a sire of winners but did exert an enduring influence on the breed though his daughter Standon Gir