Granlahan National School is a four teacher school (2 mainstream, 1 ASD Class and 1 SET) situated in the most westerly corner of County Roscommon, between the towns of Ballyhaunis in Mayo and Casterea in Roscommon. The school is very well presented with great facilities such as basketball court, school football pitch, games area, a large playground area and a Sensory Room. We are delighted to add an ASD Class to our facilities. In September 2024 we opened the doors to our Suaimhneas Room to cater for children in our locality with ASD.