Gleaston is a village with a population of around 400 in the Furness area of South Cumbria, situated between the towns of Barrow-in-Furness, Dalton-in-Furness and Ulverston. Historically in Lancashire, the history of the village can be traced as far back as the mesolithic period and it was the centre of the manor of Muchland in the Middle Ages. Today it is largely a commuter village for the nearby towns, but its past is still visible in the remains of Gleaston Castle and Gleaston Water Mill, which is open as a tourist attraction.

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.