Eas a' Chual Aluinn () in the parish of Assynt, Sutherland, Highland, Scotland, is the tallest waterfall in the United Kingdom with a drop of .
The waterfall can be reached by a walk across boggy ground from the road south of Kylesku in Sutherland. In good weather, a boat-trip runs from the slipway by the Kylesku Hotel to Loch Beag, from where the waterfall is visible.
The name is a corruption of , ("waterfall of the beautiful tresses").