Sem is a village in Øvre Eiker Municipality, in Buskerud, Norway. Sem lies at 36 m above sea level, 2.0 km from the Finnemarka mountains. The nearest city is Kongsberg, 15.2 km to the west. Among the landmarks around are Blaafarveværket (18.2 km), Drammen Museum of Art and Cultural History (18.6 km) and Fiskum old Church (6.5 km). Among the natural features are Hellefossen (4.5 km) and Labrofossen (18.3 km).