| Sun Castle | |
|---|---|
| Sire | Hyperion |
| Grandsire | Gainsborough |
| Dam | Castle Gay |
| Damsire | Buchan |
| Sex | Stallion |
| Foaled | 1938 |
| Country | United Kingdom |
| Colour | Bay |
| Breeder | Enid Scudamore-Stanhope, Countess of Chesterfield |
| Owner | Wyndham Portal, 1st Viscount Portal |
| Trainer | Cecil Boyd-Rochfort |
| Record | 6:2-0-1 (incomplete) |
| Major wins | |
| New St Leger (1941) | |
Sun Castle (1938 – March 1942) was a British Thoroughbred racehorse who raced during World War II and was best known for winning the classic St Leger in 1941. After showing promise as a two-year-old he finished third in the 2000 Guineas the following spring but ran poorly when strongly-fancied for the New Derby. He won a race at Newbury in August before taking the substitute New St Leger at Manchester Racecourse. He died in the following spring after contacting tetanus.