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Otto IV  (January 3, 1307 –  December 14, 1334 in Munich) was a Duke  of Lower Bavaria .
He was a son of Stephen I, Duke of Bavaria  and Jutta of Schweidnitz .
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.
He succeeded as Duke of Lower Bavaria  from 1310 until 1334 as co-regent of his brother Henry XIV  and his cousin Henry XV . In 1322 he was in war with his co-regents, in 1331 Lower Bavaria was finally partitioned among them. Otto then governed Burghausen , Traunstein  and several other Bavarian cities. Otto, who hated his brother made his cousin Emperor Louis IV, Holy Roman Emperor  his contracted heir.
Otto IV married Richardis of Jülich . She was a daughter of Gerhard V of Jülich  and Elisabeth of Brabant-Aarschot. They had one known child:
Albert of Wittelsbach. Born in 1332. Predeceased his father. 
Garibald I  (555–591) Tassilo I  (591–610) Garibald II  (610–625) Theodo  (c.680–716) Theodbert  (c.716–c.719) Theobald  (c.716–c.719) Tassilo II  (c.716–c.719) Grimoald  (715–725) Hugbert  (725–736) Odilo  (736–748) Grifo  (748) Tassilo III  (748–788) Louis II the German  (King: 817–843) Carloman  (King: 876–880) Louis III the Younger  (King: 880–882) Charles the Fat  (King: 882–887) Engeldeo  (Margrave: 890–895) Luitpold  (Margrave: 895–907) Arnulf  (907–937) Eberhard  (937–938) Berthold  (938–947) Henry I  (947–955) Henry II the Quarrelsome  (955–976, 985–995) Otto I  (976–982) Henry III the Younger  (983–985) Henry IV  (995–1004, 1009–1017) Henry V  (1004–1009, 1017–1026) Henry VI  (1026–1042) Henry VII  (1042–1047) Conrad I  (1049–1053) Henry VIII  (1053–1054, 1055–1061) Conrad II  (1054–1055) Otto of Nordheim  (1061–1070) Welf I  (1070–1077, 1096–1101) Henry VIII  (1077–1096) Welf II  (1101–1120) Henry IX the Black  (1120–1126) Henry X  (1126–1138) Leopold I  (1139–1141) Henry XI Jasomirgott  (1143–1156) Henry XII the Lion  (1156–1180) Otto the Redhead  (1180–1183) Agnes of Loon  (Regent: 1183–1191) Louis I  (1183–1231) Otto the Illustrious  (1231–1253) Louis II the Strict  (1253–1255; Upper: 1255–1294) Henry XIII  (Lower: 1253–1290) Louis III  (Lower: 1290–1296) Stephen I  (Lower: 1290–1310) Otto III  (Lower: 1290–1312) Matilda  (Upper: Regent: 1294–1302) Rudolph I  (Upper: 1294–1317) Henry XV the Natternberger  (Lower: 1312–1333) Otto VI  (Lower: 1310–1334) Henry XIV  (Lower: 1310–1339) John I the Child  (Lower: 1339–1340) Louis IV  (Upper: 1301–1340; 1340–1347) Otto V ,  (1347–1349; Upper: 1349–1351; Landshut: 1373–1379) Louis V the Brandenburger ,  (1347–1349; Upper: 1349–1361) Meinhard I  (Upper: 1361–1363) Louis VI ,  (1347–1365) Stephen II ,  (1347–1349; Lower: 1349–1353; Landshut: 1353–1375; Upper: 1363) William I ,  (1347–1349; Lower: 1349–1353; Straubing: 1353–1388) Albert I ,  (1347–1349; Lower: 1349–1353; Straubing: 1353–1404) Albert II  (Straubing: 1389–1397) William II  (Straubing: 1404–1417) Jacqueline  (Straubing: 1417-1429) John III the Pitiless  (Straubing: 1417-1425) William III  (Munich: 1397–1435; Straubing: 1429–1435) Ernest  (Munich: 1397–1438; Straubing: 1429–1438) Frederick I the Wise  (1375–1392; Landshut: 1392–1393) John II  (1375–1392; Munich: 1392–1397) Stephen III the Magnificent  (1375–1392; Ingolstadt: 1392–1413) Louis VII the Bearded  (Ingolstadt: 1413–1443) Louis VIII the Hunchback  (Ingolstadt: 1443–1445) Henry XVI the Rich  (Landshut: 1393–1450; Ingolstadt: 1447–1450) Albert III  (Munich: 1438–1460) John IV  (Munich: 1460–1463) Sigismund  (Munich: 1460–1467; Dachau: 1467–1501) Louis IX the Rich  (Landshut: 1450–1479) George I the Rich  (Landshut: 1479–1503) Albert IV the Wise  (Munich: 1465–1505; 1505–1508) William IV the Steadfast  (Munich: 1460–1508; Landshut: 1503–1508; 1508–1550) Louis X , Duke (1516–1545) Albert V the Magnanimous  (1550–1579) William V the Pious  (1579–1597) Maximilian I  (1597–1623)