:Gau Graig

{{Use dmy dates|date=April 2022}}

{{Infobox mountain

| name = Gau Graig

| photo = Gau Graig.jpg

| photo_caption = The Gau Graig plateau from Mynydd Moel

| elevation_m = 684

| elevation_ref =

| 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.Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. {{ISBN|1-85284-304-7}}.