The Duchy of Franken was a short-lived vassal state in the Kingdom of Bavaria existing between 1643 and 1656. Led by Maria-Sofia von Wittelsbach, the Duchy was centered in the Bishopric of Würzburg and included the smaller states of Bamberg and Burggrafschaft.
In 1656, the Duchy was absorbed into Greater Saxony and formed the Grand Duchy of Sachsen-Franken.