Namdalen is a traditional district in the central part of Norway, consisting of the municipalities Namsos, Grong, Overhalla, Røyrvik, Fosnes, Nærøy, Høylandet, Namdalseid, Flatanger, Lierne, Leka, Namsskogan, and Vikna, all in Nord-Trøndelag county. The district has two towns: Kolvereid and Namsos. The whole district covers about and has about 35,000 residents (2009).