Glaslough (// 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 and again in 2019.
There is a playground and tennis court located on the main village green. There is also a shop and café in the village. Glaslough's local football (soccer) club is Glaslough Villa F.C.
The village was previously served by Glaslough railway station, which was part of the Ulster Railway; the station opened on 25 May 1858. The Ulster Railway merged with the Irish North Western Railway (INW) and the Northern Railway of Ireland in 1876, to form the Great Northern Railway (GNR).
The partition of Ireland in 1922 turned the boundary with County Armagh into an international frontier, after which trains were routinely delayed by customs inspections. In 1957, the Government of Northern Ireland made the GNR board close the line between Portadown and the border, giving the board no option but to withdraw passenger services between the border and Clones as well. CIÉ took over the remaining section of line between Clones, Monaghan and Glaslough in 1958, but withdrew goods services between Monaghan and Glaslough in 1959 and between Clones and Monaghan in 1960, leaving County Monaghan with no railway service.
- John McKenna, first manager and later chairman of Liverpool F.C.
- Charlene McKenna, actress.
- Charles Leslie (1650-1722), nonjuring Church of Ireland priest, who became a Jacobite propagandist and helped publicise the 1692 Massacre of Glencoe.
- John Leslie, Scottish-born Church of Ireland Bishop, Royalist military commander during the English Civil War, and first member of the Leslie family to live in Glaslough.
- "Sapmap Area - Settlements - Glasslough". Census 2016. Central Statistics Office. April 2016. Retrieved 19 February 2020.
- "Glasloch / Glaslough". logainm.ie. Irish Placenames Commission. Retrieved 19 February 2020.
- "Tidy Towns of Ireland: Celebrating 50 years" (PDF). Archived from the original (PDF) on 19 April 2016.
- "Tidy Towns 2019: Glaslough in Co Monaghan wins top prize". irishtimes.com. Irish Times. 30 September 2019. Retrieved 19 February 2020.
- "Glaslough Villa FC". Soccer-Ireland.com. Retrieved 28 May 2021.
- "Glasslough" (PDF). Railscot - Irish Railways. Retrieved 29 April 2012.
- "Irish tribute to Liverpool FC legend John McKenna". liverpoolecho.co.uk. 27 August 2011. Retrieved 19 February 2020.
- "Working in the family pub was my drama school, says Charlene McKenna". independent.ie. Independent News & Media. 2 July 2017. Retrieved 19 February 2020.