Sollefteå Municipality (Swedish: Sollefteå kommun) is a Swedish municipality in Västernorrland County. Its seat is located in Sollefteå.The former City of Sollefteå (instituted in 1917) was amalgamated with the surrounding entities in 1974 to form the present municipality. It consists of fifteen original (1863) units.Geographically, the landscape is dominated by woods, and by the Ångerman River and its tributaries Faxälven and Fjällsjöälven, which cross through the municipality.