Flatdal is a village in Seljord Municipality, in Telemark, Norway. Flatdal lies at 170 m above sea level, at the foot of the Lifjell mountains. It has 485 inhabitants. The nearest city is Kongsberg, 62 km to the east. Among the landmarks around are Heddal Stave Church (35 km), Seljord Church (9.5 km) and Flatdal Church (0.8 km). Among the natural features are Rjukan Falls (34 km).