Liathach (Scottish Gaelic for 'the hoary place'; pronounced [ˈʎiəhəx])[2] is a mountain in the Torridon Hills, in the Northwest Highlands of Scotland.

The rocks are mainly red and chocolate sandstones, arkoses, flagstones and shales with coarse conglomerates locally at the base.

The Torridon landscape is itself highly denuded by glacial and alluvial action, and represents the remnants of an ancient peneplain.

Liathach has four listed "Tops" in the Munro Tables, Meall Dearg at 3133 feet (955 m) stands off the main ridge at the end of the Northern Pinnacles which run north from Mullach an Rathain.

[5] Climbing the mountain including both of the above peaks is a challenging expedition; the intervening ridge is for the most part a series of rocky pinnacles known as Am Fasarinen (The Teeth), which reaches a height of 927 metres at the western end and is considered a Munro "top".