Coláiste Lorcáin is a post-primary school located in the town of Castledermot, County Kildare, in Republic of Ireland.
The school is dedicated to St. Laurence O'Toole, the patron saint of the Arch Diocese of Dublin, who was born in the parish of Castledermot around the year 1123.
The school is under the direction of a Board of Management which includes representatives of the Sisters - The Poor Servants of the Mother of God, Kildare Vocational Education Committee, the parents and teachers of the school.
Castledermot is situated on the main Dublin - Waterford road approximately ten km north of Carlow town.
The Coláiste Lorcain Junior Rugby team won the Leinster Junior Development Cup in 2009.