Namdalseid Municipality

Namdalseid is a former municipality in Trøndelagcounty, Norway. The municipality existed from 1838 to 1846 and then again from 1904 until its dissolution in 2020 when it joined Namsos Municipality. It was part of the Namdalenregion. The administrative centre of the municipality was the village of Namdalseid. Other villages and farm areas in the municipality included Sjøåsen, Statland, , and Sverkmoen.

At the time of its dissolution in 2020, the 770-square-kilometre (300 sq mi) municipality was the 144th largest by area out of the 422 municipalities in Norway. Namdalseid Municipality was the 348th most populous municipality in Norway with a population of 1,576. The municipality's population density was 2.2 inhabitants per square kilometre (5.7/sq mi) and its population had decreased by 8.4% over the previous decade.