Skaupsjøen is a lake in the municipalities of Eidfjord in Hordaland county and Nore og Uvdal in Buskerud county, Norway. The 2.88-square-kilometre (1.11 sq mi) lake lies just north of the Hardangervidda National Park on the vast Hardangervidda plateau. The lake outflows to the river Skaupa, which flows into the larger lake Halnefjorden to the northeast.