Dunollie Castle (Scottish Gaelic: Caisteal Dhùn Ollaigh) is a small ruined castle located on a hill north of the town of Oban, on the west coast of Scotland in Argyll. The site enjoys views over towards the island of Kerrera and a view of the town, harbour, and outlying isles. The castle is open to the public as part of the Dunollie Museum, Castle and Grounds.