Crumlin (Irish: Croimghlinn, meaning "Crooked Glen") is a suburb in Dublin, Ireland. It is the site of Ireland's largest children's hospital.
Crumlin covers the area from the River Poddle near the KCR(kimmage cross roads) to Sundrive Rd and Crumlin Cross at The Submarine bar to Crumlin Village the Drimnagh Road, to Bunting Road, Crumlin Road then along the Grand Canal from Rialto Bridge to Sallys Bridge and is situated next to the city centre, on the Southside of Dublin city. Neighbouring areas include Walkinstown, Perrystown, Drimnagh, Terenure, and Kimmage. Crumlin is contained within postal district Dublin 12.
Crumlin gets its name from the crooked valley known as Lansdowne Valley. The valley was formed by glacial erosion in the distant past and is now bisected by the River Camac. The valley is situated behind Drimnagh and is largely made up of recreational parkland.
During the medieval period, Dublin was surrounded by manorial settlements comprising church, graveyard, manor house, motte and bailey, farms and cottages. These settlements grew into a network of villages around Dublin creating stability and continuity of location. Crumlin Village developed as an Anglo-Norman settlement soon after the Norman Conquest in 1170, (although the circular configuration of the old graveyard of Saint Mary’s in the village suggests pre-Norman associations), and has survived through the centuries to become the village of today. The Old Saint Mary's Church stands on the site of a 12th-century church of the same dedication, and a succession of churches occupied the site down through the centuries to the present day.
In 1193, King John (the then Prince of Moreton) gave the Crumlin church to form one prebend in the collegiate church of Saint Patrick. When the main body of the present old church was rebuilt in 1817, the old tower of a much earlier origin was preserved.