Mynydd Moel is the second highest summit of Cadair Idris in the Snowdonia National Park, in Gwynedd, northwest Wales. It lies to the east of Cadair Idris and is often climbed as a horseshoe along with Craig Cwm Amarch and Cadair Idris. The summit is bare and rocky and marked with a cairn. The north face like Cadair Idris has large cliffs. To the east is a lower broad plateau topped by the summit of Gau Graig.