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 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.