Snarumselva is a river in Buskerud county, Norway. It flows north to south from Krøderen, a lake in Krødsherad municipality, to Geithus, a village in Modum municipality, where it joins the Drammenselva river. The total length of Snarumselva is about 50 km (31 mi) and the total altitude loss is about 100 m (330 ft).