Flathus is a village in Midt-Telemark Municipality, in Telemark, Norway. Flathus lies at 204 m above sea level, in the Scandinavian mountains. The nearest city is Kongsberg, 33 km to the northeast. Among the landmarks around are Heddal Stave Church (20 km), Old Bø Church (15.7 km) and Nes Church (8.2 km). Among the natural features are Nybufjellet (5.2 km) and Skrim (18.1 km).