Otto I, Duke of Bavaria

Otto I Wittelsbach (c. 1117–1183), called the Redhead, was the first Wittelsbach Duke of Bavaria. Son of Count Palatine Otto IV of Wittelsbach, he succeeded his father as Count Palatine of Bavaria in 1156 and became a trusted military ally of Emperor Frederick Barbarossa. In 1155 he captured a position above a defile near Verona, securing the imperial army's return across the Alps.

After Henry the Lion was deposed, Barbarossa enfeoffed Otto with Bavaria at Altenburg in 1180. He died suddenly at Pfullendorf in 1183, after the Peace of Constance. His son Louis succeeded him.