Gleaston Castle is a medieval building in a valley about 1 kilometre (0.62 mi) north-east of the village of Gleaston. The village lies between the towns of Ulverston and Barrow-in-Furness in the Furness peninsula, Cumbria, England. Gleaston Castle has a quadrilateral plan, with a tower at each corner. The largest of these, the north-west tower, probably housed a hall.