Gaelscoil Ultain (Irish pronunciation: [ˈɡeːl̪ˠsˠkɛlʲ ˈʊl̪ˠt̪ˠənʲ]) is an Irish language primary education school founded in 1986 and situated on Clones Road in Monaghan, Ireland.

[2] Following an application in early 1986 to set up an all-Irish primary school in Monaghan town, the Department of Education authorised an all-Irish stream as part of St Mary's Boys National School.

The first class of 23 children was based in the old Brothers' House adjacent to the St. Mary's building and commenced in September 1986.

[2] The school celebrated 25 years in existence in 2011 with a programme of events that included a St Patrick's Day parade in March, a 'Ceolchoirm Paistí' in April and a reunion event in June.

[3] Having been in the Old Brother's school building at the top of the hill on the Clones Road since 1989, it was announced in 2011 that an educational campus on the site of the Army Barracks in Monaghan Town would be built, and in particular, the inclusion on the campus of a new permanent building for Gaelscoil Ultain.