Otto III, Count of Ravensberg

Otto III (c. 1246–1306) was count of Ravensberg from 1249. As his father Louis died while he was a minor, Bernard III of Lippe held the regency and occupied Ravensberg Castle before Otto was installed. In 1267 he fought for Archbishop Engelbert II of Cologne at the Battle of Zülpich.

On 5 March 1271 he married Hedwig of Lippe, and in 1293 founded a canonry at Bielefeld, where he and his wife were buried. His son Otto IV succeeded him.