Lowther Castle is a crenellated country house in the historic county of Westmorland, which now under the current unitary authority of Westmorland and Furness, in the ceremonial county of Cumbria, England. The estate has belonged to the Lowther family, latterly the Earls of Lonsdale, since the Middle Ages. It is a fully managed ruin, open to visits by the public to the shell of the castle and some of the gardens since 2011. Additional work was completed since that time, most recently on the extensive gardens.

Westmorland and Furness is a unitary authority area in Cumbria, England. The economy is mainly focused on tourism around both the Lake District and Cumbria Coast, shipbuilding and the port in Barrow-in-Furness, and agriculture in the rural parts of the area.