Duntrune Castle is a 17th-century Grade B listed buildingStructure of particular architectural and/or historic interest deserving of special protection. on the shore of Loch Crinan, Argyll and Bute, on the west coast of Scotland.^[1] It was the seat of the Campbells of Duntroon until 1792, when it was bought by the O’Challums (now anglicised to Malcolm), whose direct descendants still occupy the castle. Duntrune is generally accepted to be the oldest continuously inhabited castle in Scotland.^[2]

The castle is designed in a traditional L-shaped plan, and incorporates some walls of an earlier 13th-century castle. It is of two storeys and attics, and is built of rubble, with gabled slate roofs.^[1]