Namdalseid is a village and a municipality in Nord-Trøndelag county, Norway. It is part of the Namdalen region. The administrative centre of the municipality is the village of Namdalseid. Other villages and farm areas include Sjøåsen, Statland, Tøttdalen, and Sverkmoen.

The village of Namdalseid lies along Norwegian County Road 17 between Sjøåsen and Vellamelen (in Steinkjer). The 0.34-square-kilometre (84-acre) village has a population (2011) of 327. The population density of the village is 962 inhabitants per square kilometre (2,490/sq mi).

Namdalseid was established as a municipality on 1 January 1838 (see formannskapsdistrikt), but it was merged into the neighboring municipality of Beitstad on 1 January 1846. On 1 January 1904, the Namdalseid district (population: 1,368) was separated from Beitstad to form a municipality of its own (once again). On 1 January 1964, the parts of the neighboring municipality of Otterøy that were located south of the Namsenfjorden (population: 571) were transferred to Namdalseid.

The Old Norse form of the name was just Eið (or Eldueið). The name is identical with the word eið which means the "path/road between two waters" (here the Beitstadfjorden and Namsenfjorden). The Vikings used to drag boats across Namdalseid using the rivers and waterways in the area, to get from one fjord to another without having to risk crossing the treacherous Folda fjord by travelling up the sheltered Trondheim Fjord and continuing north along the coast. The passage was much easier in olden times as the sea level was higher and the waterways more numerous, but as recently as 2004 a boatdrag was done to commemorate the old traditions. Nowadays, however, one has to transport the boats by road for a fairly long stretch. The first element Namdals- was added around 1550. It is the genitive case of the old region name Namdalen.

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