Otto I, Count of Nassau | |
|---|---|
| Born | 1224 |
| Died | between 3 May 1289 and 19 March 1290 |
| Noble family | House of Nassau |
| Spouse(s) | Agnes of Leiningen |
| Father | Henry II of Nassau |
| Mother | Matilda of Guelders and Zutphen |
Otto I of Nassau (German: Otto I. von Nassau; born in 1224[1] and died between 3 May 1289 and 19 March 1290)[2][3] was Count of Nassau and is the ancestor of the Ottonian branch of the House of Nassau.