Hackpen, Warren & Gramp's Hill Downs
| Site of Special Scientific Interest | |
| Location | Oxfordshire |
|---|---|
| Grid reference | SU 357 847 |
| Interest | Biological |
| Area | 71.4 hectares (176 acres) |
| Notification | 1986 |
| Location map | Magic Map |
Hackpen, Warren & Gramp's Hill Downs is a 71.4-hectare (176-acre) biological Site of Special Scientific Interest in Letcombe Bassett in Oxfordshire.