Dernford Fen
| Site of Special Scientific Interest | |
| Location | Cambridgeshire |
|---|---|
| Grid reference | TL 472 503 |
| Interest | Biological |
| Area | 10.3 hectares |
| Notification | 1983 |
| Location map | Magic Map |
Dernford Fen is a 10.3-hectare (25-acre) biological Site of Special Scientific Interest north-west of Sawston in Cambridgeshire.
The site is a rare surviving example of rough fen and carr. Other habitats are dry grassland and scrub, together with ditches and a chalk stream. There are breeding warblers, and the diverse habitats are valuable for amphibians and reptiles.
The site is private land with no public access.