Pen yr Ole Wen is a mountain in Snowdonia, in the county of Conwy, Wales. Its height reaches 978 m (3209 feet) and is the 7th highest mountain in Snowdonia and in Wales. It is located to the north of Idwal Cottage youth hostel, from where it appears with a pyramidal shape. It can be climbed from the hostel. An easier ascent involves starting from Tal-y-Llyn Owgen, northeast from the hostel, following the stream until nearing the outflow from the mountain lake FFynnon Loer. It is frequently climbed as part of a longer path on the Carneddau group.