The Black Cuillin viewed from Glen Brittle Forest, Isle of Skye

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The Cuillin (Scottish Gaelic: An Cuilthionn or An Cuiltheann) is a range of rocky mountains located on the Isle of Skye in Scotland. The true Cuillin is also known as the Black Cuillin to distinguish it from the Red Cuilin (na Beanntan Dearga, known locally as Red Hills) across Glen Sligachan. The Red Cuilin hills are lower and, being less rocky, have fewer scrambles or climbs.

The highest point of the Cuillin, and of the Isle of Skye, is Sgùrr Alasdair in the Black Cuillin at 992 m (3,255 ft). The Cuillin is one of 40 National Scenic Areas in Scotland.

Glen Brittle (Gleann Breadail in Scottish Gaelic) is a large glen in the south of the Isle of Skye, in Scotland. It runs roughly south to north, along the River Brittle, which has its mouth at Loch Brittle (a sea loch). The glen is also overlooked from the east by the formidable Cuillin, the largest mountains on Skye. Many tributaries of the Brittle run down from these mountains into the glen.The name is probably derived from old Norse Bred Dal ("broad valley") with the Gaelic glean ("valley") being prefixed later.