Mynydd Graig Goch (Welsh, 'mountain of the red rock') is the western end peak of the Nantlle Ridge, and is a subsidiary summit of Craig Cwm Silyn.

For many years it was excluded from lists of the Welsh 2000 ft mountains because of a spot height of 609 metres (1998') on OS maps.

However, this changed in 2008; after years of speculation a group of hillwalkers carried out a precise GPS survey of the peak, measuring the absolute height as 609.75 metres (2000 ft 6 in).

The north-east face has steep cliffs, that form the backwall of the glacial Cwm Dulyn.

Garnedd Goch, Mynydd Mawr, Moel Hebog and Snowdon (Yr Wyddfa) are all observable.