Y Garn is a subsidiary summit of Pen Pumlumon Fawr and the fourth highest peak on the Plynlimon massif, a part of the Cambrian Mountains in the county of Ceredigion, Wales.
The summit is marked by a large shelter cairn, hollowed out from an ancient burial cairn. The views include Rhos Fawr, Drygarn Fawr, Pen y Garn to the south and Aran Fawddwy, Glasgwm, Tarrenhendre and Tarren y Gesail to the north. The Nant-y-moch Reservoir can also be seen to the north, with the smaller summits of Drosgol (550m) and Banc Llechwedd-mawr (560m).