Dunstaffnage Castle is a partially ruined castle in Argyll and Bute, western Scotland. It lies 3 miles N.N.E. of Oban, situated on a platform of conglomerate rock on a promontory at the south-west of the entrance to Loch Etive, and is surrounded on three sides by the sea. Dating back to the 13th century, it is one of Scotland's oldest stone castles. Guarding a strategic location, it was built by the MacDougall lords of Lorn, and has been held since the 15th century by the Clan Campbell. To this day there is a hereditary Captain of Dunstaffnage, although they no longer reside at the castle.