Clipyn Du is a mountain in northern Powys in Wales. It is one of the higher summits of the area and is located a few miles north of Plynlimon (Pumlumon). It has an elevation of 582 m (1,909 ft) and a topographic prominence of 124 m (407 ft), so is classed as a HuMP, having over 100 metres of prominence. Tarren Bwlch-Gwyn is the name of a steep-sided escarpment. Nearby is a lake, Glaslyn.