Modum is a municipality in Buskerud county, Norway. It is part of the traditional region of Hallingdal. The administrative centre of the municipality is the town of Vikersund. The municipality of Modum was established on 1 January 1838 (see formannskapsdistrikt).
The area has a long tradition of skiing with several famous skiers. Modum is home to one of the largest Ski jumping hills in the World, Vikersundbakken. The hill record, established in 2004 is an amazing jump of 219 metres (719 ft).
The municipality (originally the parish) is named after the old Modum farm (Old Norse: Móðheimr), since the first church was built here. The first element is móða which means "river" (here the Drammenselva river) and the last element is heimr which means "home", "homestead", or "farm". The name of the farm was later changed to Buskerud.