Knettishall Heath
| Site of Special Scientific Interest | |
| Location | Suffolk |
|---|---|
| Grid reference | TL 951 804 |
| Interest | Biological |
| Area | 91.7 hectares |
| Notification | 1984 |
| Location map | Magic Map |
Knettishall Heath is a 91.7-hectare (227-acre) biological Site of Special Scientific Interest west of Knettishall in Suffolk, England. A larger area of 176 hectares is the Knettishall Heath Nature Reserve, which is managed by the Suffolk Wildlife Trust.
Despite its name, Knettishall Heath is in fact a diverse mosaic of habitats with woodland and riverside meadows, as well as large areas of heath.