| Coed y Mwstwr | |
| Aos: | Wales |
| Interest: | Biological |
| Coordinates: | 51.518°N -3.5121°W |
| Displaymap: | Wales |
| Area: | 15.27 ha |
| Notifydate: | 1 January 1979 |
Coedymwstwr Woodlands is a Site of Special Scientific Interest located between Coychurch and Pencoed in Bridgend County Borough, south Wales.
The woodlands is home to Coed-y-Mwstwr cave, a caving system that has been theorised as a hiding space used by Owain Glyndŵr. The main passage is 5 metres high and 60 metres long.[1]