Doctor Syntax (1811 – 28 August 1838) was a British Thoroughbred racehorse and sire. Trained in Yorkshire, and racing exclusively in the North of England, Doctor Syntax won at least thirty-six races in ten seasons from 1814 to 1823. He was noted for his consistency and durability and recorded multiple wins in many of the period's leading staying races. He won the Preston Gold Cup on a record seven consecutive occasions, as well as five Lancaster Gold Cups and five Richmond Gold Cups. He was retired to stud in 1824 and proved a successful sire of winners, despite limited opportunities.