| Slieve Commedagh | |
| Other Name: | Sliabh Coimhéideach |
| Elevation M: | 767 |
| Elevation Ref: | [1] [2] |
| Prominence M: | 180 |
| Listing: | Marilyn, Hewitt |
| Translation: | mountain of guarding/watching |
| Language: | Irish |
| Location: | County Down, Northern Ireland |
| Range: | Mournes |
| Coordinates: | 54.1889°N -5.9387°W |
| Grid Ref Ireland: | J346286 |
| Topo: | OSNI Discoverer 29 |
Slieve Commedagh [3] [4] 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,[1] 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.[1] On its southern side is a group of granite tors known as 'the Castles'.[1]
The Slieve Commedagh massif also includes the summits of Slievecorragh (to the east), Shan Slieve, Slievenamaddy and Slievenabrock (to the north).