Finntroll is an extreme metal & folk metal band from Helsinki, Finland. They combine elements of black metal, death metal, and folk metal with a type of Finnish folk music called Humppa. Finntroll's lyrics are mostly in Swedish, the only exception being the song "Madon Laulu" on Visor Om Slutet. Finntroll's first singer Katla decided to use Swedish over Finnish since he was part of a Swedish-speaking minority in Finland and the sound of the language seemed to better suit the band's "trollish" outfit. Despite several vocalist changes, this tradition has since been continued.

According to bandmembers Vreth and Skrymer, they took their name from an old Finnish legend where Swedish priests coming to Finland had an encounter with a wild-looking man who killed most of their party. The survivors came back bearing the tale of the Finn-Troll.

Finntroll's lyrics mainly deal with legends and tales revolving around the fictional Troll-King "Rivfader" and the trolls fighting against the Christians who invade their lands and try to spread their beliefs. A recurring theme is the story of two priests named "Aamund" and "Kettil". The first three full length albums feature a rather short but fierce song about the two men who constantly get themselves into trouble with the trolls, only to get beaten up and mutilated over and over again by the wrathful followers of Rivfader.

As of November 2009, the band's discography includes 4 full-length albums and 2 EPs, a fifth album is finished and waiting for its release in early 2010.