Mòruisg is a Scottish mountain situated in the Glencarron and Glenuig Forest, 10 kilometres south west of the village of Achnasheen in the Highland council area.

Mòruisg is a long, steep sided mountain with a flat extensive summit plateau, the level top has many minor bumps and cairns and it can be difficult to ascertain the highest point, especially in mist.

Its north and western slopes descend steeply to Glen Carron, its southern flanks are precipitous as they fall the valley of the Allt a’ Chonais which contains the track to Glenuaig Lodge.

The direct ascent of Mòruisg starts on the A890 road in Glen Carron at a parking spot one kilometre west of Loch Sgamhain at grid reference NH079520.

Approaches are possible from the south using well graded stalkers' paths; one of these leaves the valley of the Allt a’ Chonais and climbs Sgùrr nan Ceannaichean first before continuing to Mòruisg.