Otto IV (January 3, 1307 – December 14, 1334 in Munich) was a Duke of Lower Bavaria.
His maternal grandparents were Bolko I, Duke of Jawor and Świdnica and Beatrix of Brandenburg.
Bolko was a son of Bolesław II the Bald and his first wife Hedwig of Anhalt.
Beatrix was a daughter of Otto V, Margrave of Brandenburg-Salzwedel and Jutta of Hennenberg.
In 1322 he was in war with his co-regents, in 1331 Lower Bavaria was finally partitioned among them.