Vasstveit is a village in Tinn Municipality, in Telemark, Norway. Vasstveit lies at 192 m above sea level, at the foot of the Blefjell mountains. The nearest city is Kongsberg, 40 km to the east. Among the landmarks around are Heddal Stave Church (30 km), Vemork (30 km) and Flesberg Stave Church (24 km). Among the natural features are Rjukan Falls (30 km) and Bletoppen (8.2 km).