Slieve Commedagh

{{Use dmy dates|date=April 2022}}

{{short description|Mountain in Northern Ireland}}

{{Infobox mountain

| name = Slieve Commedagh

| other_name = Sliabh Coimheádach{{Cite web|title=Sliabh Coimheádach/Slieve Commedagh|url=https://www.logainm.ie/en/1166721|access-date=|website=Placenames Database of Ireland}}

| photo = Slieve Commedagh - geograph - 1136954.jpg

| photo_caption = Slieve Commedagh from the south

| photo_size =

| elevation_m = 767

| elevation_ref = {{cite web |title=Slieve Commedagh |url=https://mountainviews.ie/summit/63/ |website=MountainViews Online Database |access-date=11 February 2025}}[http://www.peakbagger.com/peak.aspx?pid=8942 Peakbagger]

| prominence_m = 180

| prominence_ref =

| listing = Marilyn, Hewitt

| translation = mountain of guarding/watching

| language = Irish

| location = County Down, Northern Ireland

| range = Mournes

| coordinates = {{coord|54.188855|N|5.938667|W|type:mountain_scale:100000|format=dms|display=inline,title}}

| coordinates_ref =

| grid_ref_Ireland = J346286

| topo = OSNI Discoverer 29

}}

Slieve Commedagh ({{Irish derived place name|Sliabh Coimhéideach|the guarding/watching mountain}}){{cite web |title=Slieve Commedagh, County Down |url=https://experience.arcgis.com/experience/9b31e0501b744154b4584b1dce1f859b/page/Place-Name-Info/#data_s=id%3AdataSource_1-PlaceNames_Gazeteer_No_Global_IDs_3734%3A8865 |website=Place Names NI |access-date=11 February 2025}} is a mountain with a height of 767 m (2,516 ft) in County Down, Northern Ireland. After Slieve Donard, it is the second-highest of the Mourne Mountains and the second-highest mountain in Northern Ireland.

Slieve Commedagh is northwest of Slieve Donard, and the two are linked by a col. Further west of Slieve Commedagh is the lower summit of Slieve Corragh. The Mourne Wall passes east–west over the mountaintop, and there is a small tower at the summit. There are also the remains of an ancient burial cairn on the mountaintop. Slieve Commedagh overlooks the Glen River to the east, and the Pot of Legawherry to the west.

On its southern side are a group of granite tors known as 'the Castles'. This overlooks the Brandy Pad, a track used in the 18th century to smuggle commodities such as brandy and tobacco, mainly from Britain.{{cite web |last1=Tempan |first1=Paul |title=Irish Hill and Mountain Names |url=https://mountainviews.ie/resources/names/List2010/MVHillList09.pdf |website=MountainViews Online Database |date=2010}}

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