The Tønsberg–Eidsfoss Line or TEB is an abandoned railway between Eidsfoss and Tønsberg in Vestfold county, Norway. In use from 21 October 1901 to 31 May 1938, the private railway connected the area of Hof to Tønsberg, the coast and the Vestfold Line of the Norwegian State Railways. The main purpose of the 48.10-kilometre (29.89 mi) narrow gauge railway was to connect Eidsfos Verk to the mainline, although the railway also operated passenger trains. The line shares 6 kilometres (3.7 mi) with the Holmestrand–Vittingfoss Line (HVB), the two which from 1934 were operated by the same company, Vestfold Privatbaner.

Eidsfoss is a village in Holmestrand Municipality in Vestfold county, Norway. The village is located at the southern end of the lake Eikeren, about 7 kilometres (4.3 mi) north of the village of Hof and about 20 kilometres (12 mi) southeast of the village of Vestfossen. The village itself is mostly located on a small isthmus of land between two lakes, with a river connecting them.