The Namsenfjorden or Namsfjorden is a fjord in Nord-Trøndelag county, Norway. The 35-kilometre (22 mi) long fjord flows along the border between the municipalities of Namsos, Namdalseid, and Flatanger. It runs southeast from the Folda, between the mainland in the south and the island of Otterøya in the north, past the island of Hoddøya, to the Namsen river estuary in the town of Namsos. The banks of the fjord are mostly wooded and not very high. Near Namsos, the Løgnin arm branches to the south all the way to the village of Sjøåsen in Namdalseid. Other villages along the fjord include Statland, Tøttdalen, Skomsvoll, Bangsund, and Spillum.
Coordinates: 64°35′N 11°06′E / 64.583°N 11.100°E