| John II, Count of Nassau-Wiesbaden-Idstein | |
| Noble Family: | House of Nassau |
| Father: | Adolph II, Count of Nassau-Wiesbaden-Idstein |
| Mother: | Margaret of Baden |
| Spouse: | Mary of Nassau-Siegen |
| Birth Date: | 1419 |
John II of Nassau-Wiesbaden-Idstein (born: 1419; died: 9 May 1480) was a son of Adolph II, Count of Nassau-Wiesbaden-Idstein and his wife Margarete of Baden, a daughter of Margrave Bernard I, Margrave of Baden-Baden en Anna of Oettingen. After his father's death in 1426, he ruled Nassau-Wiesbaden and Nassau-Idstein.
In 1437, he married Mary (1418–1472), daughter of Engelbert I of Nassau.They had the following children:
After his death, the inheritance was divided: Adolf III received Wiesbaden; Philip received Idstein. When Philip died childless in 1509, Idstein reverted to Adolf.