Glaslough or Glasslough ( /ɡlæsˈlɒx/ glas-lokh; Irish: Glasloch, meaning "green lake") is a village and townland in the north of County Monaghan, Ireland, on the R185 regional road 3 km (2 mi) south of the border with Northern Ireland and 10 km (6 mi) northeast of Monaghan Town. Glaslough won the Irish Tidy Towns Competition in 1978. Castle Leslie, the large Victorian country house and luxury hotel, is located on the edge of the village.