Kilcoo (from Irish Cill Chua, meaning 'church of mourning' – from the legend that Saint Patrick's body stayed there while on its way to Downpatrick to be buried)[1] is a small village and civil parish in County Down, Northern Ireland.

It lies between Rathfriland and Castlewellan and is within the Newry, Mourne and Down District Council area.

The village is on the A25 Dublin Road 6 kilometres (4 mi) south-west of Castlewellan.

East of the lough is Drumena Cashel, a stone ringfort that was used in the Early Christian period (500–1200 AD).

This a Gaelic Athletic Association club with teams in Gaelic football and Camogie Kilcoo is classified as a rural settlement by the Northern Ireland Statistics and Research Agency (NISRA) .