Tarrenhendre is a Hewitt of 633.8 m in Gwynedd. It is one of only four register hills in the Dolgellau to Machynlleth region, with Cadair Idris – Penygadair, Maesglase and Tarren y Gesail.
All four of its nearest neighbours lie to the north, so it stands at the southern edge of its group. On the Hewitts height ladder it sits between Bencullagh (634 m) and Starling Dodd (633 m).