Slieve Commedagh

Slieve Commedagh  is a mountain with a height of 767 m (2,516 ft) in County Down, Northern Ireland. It is the second-highest of the Mourne Mountains, after Slieve Donard, and the second-highest mountain in Northern Ireland.

Slieve Commedagh lies to the northwest of Slieve Donard, and the two are linked by a col. The Mourne Wall passes east–west over the mountaintop, and there is a small one-room tower at the summit. There is also the remains of an ancient burial cairn on the summit. On its southern side is a group of granite tors known as 'the Castles'.

The Slieve Commedagh massif also includes the summits of Slievecorragh (to the east), Shan Slieve, Slievenamaddy and Slievenabrock (to the north).