:See Glen Shiel for the much smaller Loch Shiel in Lochalsh.
Loch Shiel () is a freshwater loch situated west of Fort William in the Highland council area of Scotland. At long it is the 4th longest loch in Scotland, and is the longest to have retained a natural outflow without any regulation of its water level,
The surrounding highlands are picturesque but relatively rarely climbed as none quite reaches the required for Munro status. The area is well wooded compared to the many Highland areas that have suffered from overgrazing. The view of the loch looking south from the Glenfinnan monument, showing wooded hillsides with bare summits rising steeply from a fjord-like loch, has become one of the most famous images of the Scottish Highlands. and was formed at the end of the last ice age when glacial deposits blocked what was formerly a sea loch.