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.

Clach Glas
Clach Glas viewed from Blaven
Highest point
Elevation	786 m (2,579 ft)
Prominence	c. 91 m
Parent peak	Blaven
Listing	Corbett Top
Naming
English translation	Grey/blue stone
Language of name	Scottish Gaelic
Geography
Location	Cuillin, Scotland
OS grid	NG534221
Topo map	OS Landranger 32
Climbing
First ascent	1888, Charles Pilkington and party
Easiest route	scrambling (Easy–Moderate)

Ashley Abraham called it "the Matterhorn of Skye" (a description which is often still used).

According to some sources the first ascent of the top was probably not until 1888 by Charles Pilkington and party.^[1]