Count John Louis II of Nassau-Wiesbaden-Idstein (born: 21 May 1596; died: 9 June 1605 at Dillenburg) was the youngest and only surviving son of John Louis I and Maria of Nassau-Dillenburg. He was only a few weeks old when his father died and he inherited Nassau-Wiesbaden and Nassau-Idstein. However, he died when he was nine years old. With his death, the Nassau-Wiesbaden-Idstein line died out. Wiesbaden and Idstein fell back to Nassau-Weilburg, thereby reuniting all the territories of the Nassau-Walram ΙΙ line in one hand.