Aran Fawddwy is a mountain in southern Snowdonia, Wales, United Kingdom. It is the only peak in Wales outside of North Snowdonia above 900m, and higher than anywhere in Great Britain outside of Northern Snowdonia, the Scottish Highlands and the Lake District. The nearest urban centres to the mountain are Dinas Mawddwy to the south, Llanymawddwy to the southeast, Llanuwchllyn on the shores of Bala Lake to the north, and Rhydymain to the west.
The nearest settlements with more than 1,500 people are Bala and Dolgellau. On the eastern slopes of Aran Fawddwy is the small lake named Creiglyn Dyfi, the source of the River Dyfi. Its sister peak is Aran Benllyn at 885m.
A cairn is placed on the eastern ridge as a memorial to RAF Mountain Rescue team member Michael Robert Aspain who was struck and killed by lightning in 1960.