Trollhättan is a Municipality in Västra Götaland County, in western Sweden. The municipality covers an area of 411.5 km². Of the total population of 52,891, 26,726 are male, and 26,165 are female. The population density of the community is 129 inhabitants per km².
The name "Trollhättan" comes from folkloristic tales. People believed that large trolls lived in the river Göta älv and that the islands in the river were the Trolls' hoods ("hättor").