Rathangan is a town in the west of County Kildare, Ireland. As of 2022, the population was 3,263. It is located 65 km from the centre of Dublin, and 14 km from Kildare, at the intersection of the R401, R414, and R419 regional roads. The Slate River and the Grand Canal run through the town. The town is in a townland and civil parish of the same name. Rathangan is situated beside the Bog of Allen, and is in close proximity to the lowlands of the Curragh.