Maesglase is a mountain in Snowdonia, North Wales, situated approximately four miles to the south-west of Aran Fawddwy.

[1] It can be reached by an easy but steep walk through the forestry from Dinas Mawddwy or directly from the bwlch on the A470.

Traditionally, the top of Maen Du (674 metres (2,211 ft) at SH823152) was regarded as Maesglase's summit.

Above the semi-improved grassland is some bracken but much of the higher ground is covered in typical Calluna / Erica communities interspersed with large areas of Juncus, Carex and Sphagnum bogs.

Half a mile to the west of the peak of Cribin Fawr at a high point of 659 metres (2,162 ft) is a stone boundary marker dated 1861 and inscribed CCC and bearing a benchmark.