The Duchy of Inowrocław () was one of the territories created during the period of the fragmentation of Poland. It was originally part of the Duchy of Kuyavia, but was separated by Ziemomysł and Władysław I the Elbow-high, upon the death of Duke Casimir I in 1267.
The Inowrocław Voivodeship was established on the territory of duchy in 1364.
Dukes of Inowrocław 1267–1287 Ziemomysł of Kuyavia 1287–1320/24 Leszek of Kuyavia, son 1287–1314 Przemysł of Sieradz, younger brother, with Leszek 1320/24-1327 Przemysł of Sieradz, again 1327–1333 Władysław I the Elbow-high, brother of Ziemomysł of Kuyavia 1333-1370 Casimir III the Great, son 1370-1377 Casimir IV, Duke of Pomerania, adopted son 1378-1392 Władysław Opolczyk, great-grandson of Władysław I the Elbow-high
Sources Inowrocław is the pearl of Kujawy