Otto III | |
|---|---|
| Duke of Carinthia | |
 | |
| Born | c. 1265 |
| Died | 25 May 1310 |
| Noble family | Meinhardiner |
| Spouse(s) | Euphemia of Legnica |
| Father | Meinhard, Duke of Carinthia |
| Mother | Elisabeth of Bavaria |
Otto III (c. 1265 – 25 May 1310), a member of the House of Gorizia (Meinhardiner dynasty), was Duke of Carinthia and Count of Tyrol from 1295 until his death. He ruled jointly with his younger brothers Louis and Henry VI.