| Gau Graig | |
| Elevation M: | 684 |
| Prominence M: | 25 |
| Parent Peak: | Cadair Idris |
| Listing: | Deleted Hewitt, Nuttall |
| Language: | Welsh |
| Location: | Gwynedd, Wales |
| Range: | Cadair Idris |
| Grid Ref Uk: | SH744141 |
| Topo: | OS Landranger 124, Explorer OL23 |
| Easiest Route: | Hike |
Gau Graig is a subsidiary summit of Cadair Idris in the Snowdonia National Park, in Gwynedd, northwest Wales. It lies to the east of Mynydd Moel on a broad grassy plateau. It marks the eastern end of the Cadair Idris ridge.
The summit is marked by a cairn. To the north are Y Garn and Diffwys, to the west Rhobell Fawr and Aran Fawddwy and to the south are Waun-oer and Cribin Fawr.[1]