Otto of Brunswick may refer to:
Otto IV, Holy Roman Emperor (1175–1218) Otto I, Duke of Brunswick-Lüneburg (1204 – 1252), also called Otto the Child Otto the Mild, Duke of Brunswick-Lüneburg (1292–1344) Otto II, Duke of Brunswick-Lüneburg (1266–1330), also called Otto the Strict Otto III, Duke of Brunswick-Lüneburg (1296–1352) Otto IV, Duke of Brunswick-Lüneburg (d. 1446), also called Otto the Lame Otto V, Duke of Brunswick-Lüneburg (1439–1471), also called Otto the Victorious Otto, Duke of Brunswick-Grubenhagen (1320–1398), also called Otto the Tarantine Otto I, Duke of Brunswick-Harburg (1495–1549) Otto II, Duke of Brunswick-Harburg (1528–1603) Otto III, Duke of Brunswick-Harburg (1572–1641) Otto II, Duke of Brunswick-Osterode (1396-1452) Duke Otto Henry of Brunswick-Harburg (1555-1591) Francis Otto, Duke of Brunswick-Lüneburg (1530–1559) Otto II of Brunswick-Wolfenbüttel (c. 1364–1406), Archbishop of Bremen