Trollhätte Canal, Maritime canal in Trollhättan, Sweden.

Trollhätte Canal runs 82 km from Lake Vänern to the Kattegat, of which 10 km are dug and blasted channel and the rest is the Göta älv river. Six locks overcome a 43.8 m height difference: one at Lilla Edet, four in Trollhättan and one at Brinkebergskulle. In Trollhättan three lock flights lie parallel, but only the 1916 flight is in use. The canal is a listed national monument since 2004.

The system was built in the early 1800s to enable trade between inland regions and the coast. A major expansion in the early 1900s enlarged the locks considerably, making them accessible to larger vessels.

The canal's name comes from Trollhättan, where the falls forced boats to be hauled overland; in the mid-1700s up to 900 horses were needed for that transport. The three lock flights of 1800, 1844 and 1916 lie parallel in the town, and only the 1916 flight is navigable. The German general Theodor von Hallberg-Broich called the canal "the Swedish nation's triumph".

The canal is open to private boats and small passenger vessels, with mooring points available at several locations along the route. Visitors should come during warmer months when the water is ice-free and the paths are comfortably walkable.

In Trollhättan three lock flights lie side by side: the 1793–1800 rock-cut staircase of 13 chambers, called the "eighth wonder of the world" at the time, the 1844 flights of nine chambers, and the working 1916 locks. Only the easternmost 1916 flight is navigable; the older chambers stand dry, their gates removed or barred.