Fellen is a municipality located in the Main-Spessart district within the Regierungsbezirk of Lower Franconia (Unterfranken) in the German state of Bavaria. It serves as a local administrative unit and is a member of the Verwaltungsgemeinschaft of Burgsinn.
The town is situated in the regional landscape of Lower Franconia, characterized by its integration into the surrounding municipal associations of the Main-Spessart area.