Otto the Illustrious | |
|---|---|
| Duke of Saxony | |
 Depiction of Otto I Dux, in the Chronica Sancti Pantaleonis, Cologne (c. 1237) | |
| Reign | 880 - 912 |
| Predecessor | Bruno, Duke of Saxony |
| Successor | Henry the Fowler |
| Born | c. 830/51 Saxony, Germany |
| Died | 30 November 912 Wallhausen, Saxony |
| Buried | Gandersheim Abbey |
| Noble family | Ottonian dynasty |
| Spouse(s) | Hathui of Babenberg |
| Issue | Thankmar Liudolf Henry the Fowler Oda of Saxony |
| Father | Liudolf, Duke of Saxony |
| Mother | Oda |
Otto (c. 830/835/51 – 30 November 912), called the Illustrious (German: Otto der Erlauchte) by later authors, was a notable member of the Ottonian dynasty and Duke of Saxony from 880 until his death in 912. He played an important role in early medieval history of Germany during the 9th and 10th centuries, known for his military campaigns and diplomatic efforts.