Ellen Widder (born 8 September 1955) is a German historian.
With Heinz Stoob she received her doctorate at the University of Münster in 1986 with a thesis on the rule of travel Karls IV.
Eine Beitrag zur Strukturgeschichte der spätmittelalterlichen Landesherrschaft, which is now augmented and published as Kanzler und Kanzleien im Spätmittelalter.
Eine Histoire croisée fürstlicher Administration im Südwesten des Reiches.
Since October 1997 she has taught as Professor of Medieval History at the University of Tübingen.