Moel y Cerrig Duon is a subsidiary summit of Esgeiriau Gwynion in Gwynedd in north Wales.
Moel y Cerrig Duon tops the eastern end of a long peat bog plateau along with Llechwedd Du. Its summit has a conical shape, rising suddenly from the bog. The summit itself is grassy, marked by a small cairn and a stake (this stake was not present on my visit in 2019). To the north-east is Foel y Geifr, to the east Cyrniau Nod and to the west is Llechwedd Du, Esgeiriau Gwynion, and Aran Fawddwy. It is a UK listed Nuttall.