Mynydd Moel is a subsidiary 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.