Calderglen High School (Scottish Gaelic: Àrd-sgoil Ghlinn Challdair) is a state-run secondary school in the St Leonards area of the Scottish new town East Kilbride, in South Lanarkshire. The complex of buildings is situated on the precipitous bank of the Rotten Calder Water, overlooking a meander named the School Bend. The school derives its name from the Calder Glen (gorge) which the river occupies, which is a site of special scientific interest (SSSI). The school has a pupil roll of approximately 2,000, and 130 teachers, making it one of the largest secondary institutions in Europe.