Cullahill
Image:Cullohill Castle.jpg|thumb|upright|Cullahill Castle
Cullahill or Cullohill is a small village situated on the R639 road in County Laois, Ireland. Cullahill takes its name from an ancient forest that covered Cullahill Mountain and extended down to Cullahill Castle.
History
A priory of Augustine canons was founded here in 550 by O'Dempsey, under the invocation of St. Tighernach who is now the patron saint of the area.The village is home to an impressive early 15th century tower house, once the principal stronghold of the MacGillapatricks of Upper Ossory. The castle bears the image of a sheela na gig.
Under their patronage, a medical school flourished at Aghmacart townland, about a mile from the castle from before 1500 to c.1610. It was conducted by the Ó Conchubhair family. Its physicians included Donnchadh Óg Ó Conchubhair, Risteard Ó Conchubhair, Donnchadh Albanach Ó Conchubhair and Cathal Ó Duinnshléibhe.
According to 1837 records, Cullohill was listed as a village in the parish of Aghmacart. Aghmacart is now a townland of Cullahill and contains an old church and graveyard which are still in use.
It is now part of Durrow parish and is in the Roman Catholic Diocese of Ossory.