Catholic University School (C.U.S.) is a private (voluntary) secondary school for boys in Dublin, Ireland. The school was founded in 1867 by Bartholomew Woodlock as a preparatory school for the Catholic University of Ireland, the predecessor to University College Dublin, that was founded by St. John Henry Newman in 1854. Under the custodianship of the Marist Fathers, the private school has educated Irish politicians, academic and literary figures, and three Olympic gold medalists.