Leamington (1853–1878) was a champion American Thoroughbred racehorse and an influential sire in the United States during the second half of the nineteenth century.

Leamington only carried 93 pounds (42 kg), due to his poor reputation gained as a three-year-old, and he easily won the race.

Leamigton had a successful start to his six-year-old season, easily winning the Chester Cup against a good field.

He was then purchased by the Canadian Roderick W. Cameron for £1,575, and stood at General Abe Buford's Bosque Bonita Stud near Versailles, Kentucky for the 1866 season.

He bred only thirteen mares, but produced an outstanding crop of foals, including Longfellow, Enquirer, Lyttleton, Lynchburg, Anna Mace, and Miss Alice.

Leamington was sold to Aristides Welch, who stood the stallion at his Erdenheim Stud, near Philadelphia, Pennsylvania.