St. Nicholas' Monastery National School is an all-boys primary school in Dundalk, Co. Louth, founded in 1915 by the De La Salle Brothers. The school serves the Castletown community and surrounding areas, fostering an inclusive environment that welcomes pupils from diverse backgrounds and nationalities. Guided by the ethos of St. John Baptist De la Salle, the school focuses on preparing students for life both practically and spiritually, while maintaining a warm, community-oriented atmosphere supported by an active Board of Management and Parents' Association.