Loch Oich is a freshwater loch in the Highlands of Scotland which forms part of the Caledonian Canal, of which it is the highest point. This narrow loch lies between Loch Ness and Loch Lochy in the Great Glen. It is fed by the River Garry from the west, and feeds the River Oich from its northern end. The Laggan locks separate it from Loch Lochy.