Sømna is a municipality in Nordland county, Norway. It is part of the Helgeland traditional region. The administrative center of Sømna is the village of Vik i Helgeland. Other villages in the municipality include Dalbotn, Sund, Vennesund, and Berg.

Nordland is a county in Norway in the Northern Norway region, bordering Troms in the north, Trøndelag in the south, Norrbotten County in Sweden to the east, Västerbotten County to the south-east, and the Atlantic Ocean to the west. The county was formerly known as Nordlandene amt. The county administration is in the town of Bodø. The remote Arctic island of Jan Mayen has been administered from Nordland since 1995. In the southern part of the county is Vega, listed on the UNESCO World Heritage Site list.