Furness Abbey, or St. Mary of Furness, is a former Catholic monastery located to the north of Barrow-in-Furness, Cumbria, England. The abbey dates back to 1123 and was once the second-wealthiest and most powerful Cistercian monastery in the country, behind Fountains Abbey, prior to its dissolution during the English Reformation. The abbey contains a number of individual Grade I Listed Buildings and is a Scheduled Monument.