Loch Tollaidh is a freshwater loch in Wester Ross, Scotland, roughly 2.3km southwest of the village of Poolewe. It sits beside the A832 road in a large expanse of moorland.

The loch's name derives from the Scottish Gaelic toll, meaning "hole" or "hollow" i.e. "Loch of the Hollow".

Loch Tollaidh sits on a bedrock of Lewisian gneiss, and has several excellent bouldering crags on its southern shore.

Several small islands sit within the loch, the largest of which is believed to have been a crannog. Several texts from the early 20th century describe a later stone "castle" occupying the site, in the hands of Clans MacBeth and then MacLeod before its abandonment in 1480. Underwater remains show evidence of stone causeways.

A small commercial Atlantic salmon farm operated on the loch from the late 1980s until it's removal in the late 2010s.