Loch Torridon (Scottish Gaelic: Loch Thoirbheartan) is a sea loch on the west coast of Scotland in the Northwest Highlands. The loch was created by glacial processes and is in total around 15 miles (25 km) long. It has two sections: Upper Loch Torridon to landward, east of Rubha na h-Airde Ghlaise, at which point it joins Loch Sheildaig; and the main western section of Loch Torridon proper. Loch a' Chracaich and Loch Beag are small inlets on the southern shores of the outer Loch, which joins the Inner Sound between the headlands of Rubha na Fearna to the south and Red Point to the north.

The name Thoirbhearta has a similar root to Tarbert and indicates a place where boats were dragged overland.

The islets in the loch include:

Shieldaig Island has been owned by the National Trust for Scotland since 1970. It has a coverage of Scots Pine, which may have grown from seeds taken from Speyside in the mid-19th century.

Torridon village lies at the head of the loch and is surrounded by the spectacular Torridon Hills. To the north are the villages of Redpoint, Diabaig, Wester Alligin and Alligin Shuas. To the south is Shieldaig.

The loch is surrounded by various mountains to the north, including Liathach, Beinn Alligin and Beinn Eighe, all of which are over 3,000 feet (910 m) in height.

The Torridon Hills exhibit dramatic mountain scenery. The rocks of which they are made are known as Torridonian sandstone, some of which are crowned by white Cambrian quartzite. They are amongst the oldest rocks in Britain, and sit on yet older rocks, Lewisian gneiss.

Loch Torridon is an important prawn and shellfish fishery and is home to several salmon farms and industrial mussel production.