Carnedd Llewelyn is a mountain massif in the Carneddau range in the Snowdonia National Park, North West Wales. At 1064 meters it is the second highest peak in Wales, Snowdon being the highest at 1085 meters. Lying in the middle of the main north-east to south west ridge of the Carneddau range between Carnedd Dafydd to the south west and Foel Grach to the north. It is often summited as part of the Welsh 3000 ft. mountain challenge which includes the Carnedd Llewelyn, Carnedd Dafydd and Yr Ellen mountains.