Loch Awe (Scottish Gaelic: Loch Obha) is a large body of water in Argyll and Bute, Scotland. It has also given its name to a village on its banks, variously known as Loch Awe, or Lochawe.
It is the third largest freshwater loch in Scotland with a surface area of 38.5 square kilometres (14.9 square miles). It is the longest freshwater loch in Scotland, measuring 41 kilometres (25.47 miles)from end to end with an average width of 1 kilometre (0.62 miles).
The loch runs approximately south-west to north-east, roughly parallel to the two sea lochs of Loch Etive and Loch Fyne. Via the River Awe and Loch Etive it drains westward from its northern end and thus into the Atlantic Ocean.
At the narrowest section of the loch are North Port (Taychreggan Hotel) and South Port (Portsonachan Hotel). Once used by cattle drovers, a ferry ran between these shores to facilitate crossing to markets beyond. The Transatlantic Cable, which runs through the village of Kilchrenan, was laid across at this point in 1955.
Loch Awe contains several ruined castles on islands, and at the northern end has one of the most photographed castles in Scotland, Kilchurn Castle, which in summer may be visited by a short boat trip or by a half mile walk from a small car park just after the bridge over the River Orchy.