Clach Glas is a mountain on the Black Cuillin of the Isle of Skye, Scotland. Its elevation is 786 m (2,579 ft) and the name translates as The Grey Stone. It is often traversed as a sustained scrambling route to Blà Bheinn, mostly at a standard between Easy and Moderate, depending on the line followed (see Parker, routes 101 & 102). It is the penultimate mountain in the Greater Traverse of the Black Cuillin.