| Graig Syfyrddin | |
| Elevation M: | 423 |
| Prominence M: | 235 |
| Parent Peak: | Ysgyryd Fawr |
| Listing: | Marilyn |
| Location: | Monmouthshire, Wales |
| Range: | Brecon Beacons |
| Grid Ref Uk: | SO403210 |
Graig Syfyrddin or just The Graig, is a 423m high hill near Grosmont in north-eastern Monmouthshire, Wales. The summit knoll is known as Edmund's Tump. The hill consists of an isolated mass of the micaceous sandstones of the Brownstones Formation, a unit of the Old Red Sandstone well known from the nearby Black Mountains, of which it can be considered an outlier in both the geographical and geological sense.[1]
The Three Castles Walk,[2] a waymarked recreational walk in Monmouthshire linking Grosmont Castle, White Castle (Wales) and Skenfrith Castle passes over the hill.