Carnedd Llewelyn, also spelled Carnedd Llywelyn, is a mountain massif in the Carneddau range in Snowdonia, north-west Wales. It is the highest point of the Carneddau at 1,064 metres (3,491 ft) and the second-highest peak by relative height in Wales, 49th in the British Isles and lies on the border between Gwynedd and Conwy.