Mjøndalen is a built up area in Drammen municipality in Buskerud county, Norway.

[1] Mjøndalen has a friendly sports rivalry with the neighbouring communities of Solbergelva and Krokstadelva.

In football, Mjøndalen IF Fotball plays in Eliteserien, the top tier in the Norwegian league system.

[3] Portåsen is a museum honouring the life and writing of Herman Wildenvey, a prominent Norwegian poet.

He lived in Mjøndalen as a young child and later moved to a farm near the village.