Carlingwark Loch is a small freshwater loch in the historical county of Kirkcudbrightshire, Dumfries and Galloway, Scotland lying just south of Castle Douglas and is roughly rectangular in shape, trending nearly north and south. The name of the loch comes from the Scots Gaelic word Caer meaning fort and wark the old Scots language word for work. There are four artificial islets in the loch showing evidence of fortification and settlement, Ash Island is thought to be a crannog. Several archaeological finds have been retrieved from the loch including a bronze cauldron, sword and pan and two dugout canoes.