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| Otto I (III) | |
|---|---|
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| King of Hungary and Croatia Contested by Charles I | |
| Reign | 6 December 1305 - June 1307 |
| Coronation | 6 December 1305, Székesfehérvár |
| Predecessor | Wenceslaus |
| Successor | Charles I |
| Duke of Lower Bavaria | |
| Reign | 3 February 1290 – 9 November 1312 |
| Predecessor | Henry XIII |
| Successor | Henry XV |
| Born | 11 February 1261 Burghausen |
| Died | 9 November 1312 (aged 51) Landshut |
| Burial | |
| Spouse | Catherine of Habsburg Agnes of Glogau |
| Issue among others... | Henry XV, Duke of Bavaria |
| House | House of Wittelsbach |
| Father | Henry XIII, Duke of Bavaria |
| Mother | Elizabeth of Hungary |
| Religion | Roman Catholicism |
Otto III (11 February 1261 – 9 November 1312), a member of the Wittelsbach dynasty, was the Duke of Lower Bavaria from 1290 to 1312 and the King of Hungary and Croatia between 1305 and 1307. His reign in Hungary was disputed by Charles Robert of the Angevin dynasty.