Bagn is the administrative centre of Sør-Aurdal Municipality in Innlandet county, Norway. The village is located in the Begnadalen valley, about 25 kilometres (16 mi) to the southeast of the town of Fagernes. The river Begna runs through the village on its way through the Valdres region. The river has a 16-metre (52 ft) tall waterfall at Bagn. The European route E16 highway passes through the village on its way between Bergen and Oslo. The 0.86-square-kilometre (210-acre) village has a population (2021) of 627 and a population density of 731 inhabitants per square kilometre (1,890/sq mi).