Pen y Castell is a summit in the Carneddau mountains in north Wales.

It tops the east ridge of Drum (Wales).

The summit consists of rocky outcrops amid a small boggy plateau.

Views of the higher Carneddau ridge to the west, Craig Eigiau to the south, Tal y Fan to the north and the Conwy valley to the east can be seen.

This Conwy County Borough location article is a stub.