is a town in Notodden Municipality in Telemark county, Norway. It is also the administrative centre of the municipality. The town is located at the north end of the lake Heddalsvatnet, at the mouth of the river Tinnelva. The villages of Heddal and Yli lie about 5 kilometres (3.1 mi) to the west of the town. The villages of Hjuksebø and Hjuksevelta both lie about 8 kilometres (5.0 mi) to the south of the town. The town of Kongsberg is located about 28 kilometres (17 mi) to the east of the town. The village of Bolkesjø is located about 20 kilometres (12 mi) to the north of the town.