| Gerlach II, Count of Nassau-Wiesbaden | |
| Noble Family: | House of Nassau |
| Father: | Adolph I, Count of Nassau-Wiesbaden-Idstein |
| Mother: | Margaret of Nuremberg |
| Spouse: | Agnes of Veldenz |
| Birth Date: | 1333 |
| Death Date: | 1386 |
Gerlach II, Count of Nassau-Wiesbaden (1333–1386) was the eldest son of Adolph I, Count of Nassau-Wiesbaden-Idstein and his wife Margaret of Nuremberg. When his father died in 1370, he inherited Nassau-Wiesbaden.
He married Agnes, a daughter of Henry II of Veldenz. The marriage remained childless. After his death, his younger brother, Walram IV, inherited Wiesbaden.