Otto, Duke of Austria
| Otto the Merry | |
|---|---|
Portrait by Anton Boys, c. 1580 | |
| Duke of Austria and Styria (jointly with Albert II) | |
| Reign | 1330–1339 |
| Predecessor | Frederick the Fair |
| Successor | Albert II (alone) |
| Duke of Carinthia (jointly with Albert II) | |
| Reign | 1335–1339 |
| Predecessor | Henry of Bohemia |
| Successor | Albert II (alone) |
| Born | 23 July 1301 Vienna, Austria |
| Died | 17 February 1339 Neuberg Abbey, Duchy of Styria |
| Spouses | Elizabeth of Bavaria Anne of Bohemia |
| Issue | Frederick II, Duke of Austria Leopold II, Duke of Austria |
| House | Habsburg |
| Father | Albert I of Germany |
| Mother | Elisabeth of Carinthia |
Otto, known as the Merry (German: der Fröhliche; 23 July 1301 – 17 February 1339), was Duke of Austria and Styria from 1330, as well as Duke of Carinthia from 1335 until his death. A member of the House of Habsburg, he ruled jointly with his elder brother Duke Albert II.