Kazimierz III of Gniewkowo (ca. 1280/84 – 22 August 1345/13 May 1350), was a Polish prince member of the House of Piast, Duke of Inowrocław during 1287-1314 (under the regency of his mother until 1294 and his brother during 1294–1296), since 1306 vassal of the Kingdom of Poland, Governor of the Duchy of Pomerelia (Gdańsk Pomerania) during 1306-1309 (on behalf of his uncle Władysław I the Elbow-high), after 1314 ruler over Gniewkowo (between 1332 and 1343 deposed by the Teutonic Order).
| Kazimierz III of Gniewkowo | |
|---|---|
| Issue | Elizabeth |
He was the third and youngest son of Ziemomysł of Inowrocław and Salomea, daughter of Sambor II, Duke of Pomerelia.