Dun Cruinn is a prehistoric site about north-west of Portree, on the Isle of Skye, Scotland. It is on the Skerinish Peninsula, between Loch Snizort Beag and Loch Eyre.
There is a fort on a rocky knoll: it is an irregular oval, about north-northwest to south-southeast, by , enclosing an area of about . The wall of the fort is now seen as a band of rubble, about thick, best preserved in the north. It is divided about midway by a rampart and ditch.
In the south of the fort are the remains of a dun (or broch), built later than the fort, diameter about and having a maximum height of .