Guttorm Sigurdsson was the king of Norway from January to August 1204, during the Norwegian civil war era. As a grandson of King Sverre, he was proclaimed king by the Birkebeiner faction when he was just four years old. Although obviously not in control of the events surrounding him, Guttorm's accession to the throne under the effective regency of Haakon the Crazy led to renewed conflict between the Birkebeiner and the Bagler factions, the latter supported militarily by Valdemar II of Denmark.

The civil war era in Norway began in 1130 and ended in 1240. During this time in Norwegian history, some two dozen rival kings and pretenders waged wars to claim the throne.