Aran Benllyn is a subsidiary summit of Aran Fawddwy in southern Snowdonia, North Wales, Wales, United Kingdom. It is the second highest peak in the Aran mountain range.
It rises from the south shore of Bala Lake, and tops the northern point on the main Aran ridge. In between it and Aran Fawddwy lies another summit: Erw y Ddafad-ddu.