Torthorwald Castle is a large ruined rectangular tower at the center of the village of Torthorwald just outside Dumfries and Galloway in south west Scotland. The first castle on the site was an earthwork motte-and-bailey built in the 12th century. The earliest building which forms part of the current ruins was built in the 14th century. The basement and first floor hall of this tower are vaulted and in one corner is a turnpike stair that leads to the upper floors. It appears that the original entrance was on the first floor.