Liathach is a mountain in the Torridon Hills. At a height of , it lies to the north of the A896 road, in the Northwest Highlands of Scotland, and has two peaks of Munro status: Spidean a' Choire Lèith at the east of the main ridge, and Mullach an Rathain at the western end of the mountain. The name is pronounced ] in Scottish Gaelic, and means 'The grey one'.