| Sam Arnull | |
|---|---|
| Occupation | Jockey |
| Born | c. 1760 |
| Died | February 1800 Newmarket, Suffolk |
| Major racing wins | |
| Major races Derby Stakes (1780, 1782, 1787, 1798) Oaks Stakes (1794) | |
| Significant horses | |
| Assassin, Diomed, Hermione, Sir Harry, Sir Peter Teazle | |
Sam Arnull (c. 1760 – 1800[1]) was a British flat racing jockey of the 18th century. He won the inaugural running of Britain's foremost flat race, The Derby, on Diomed, one of the most influential horses in Thoroughbred history, and won again on a further three occasions.