Adolph I, Count of Nassau-Wiesbaden-Idstein
Born	1307 (1307)
Died	17 January 1370(1370-01-17) (aged 62–63)
Noble family	Nassau
Spouse(s)	Margaret of Nuremberg
Father	Gerlach I of Nassau-Wiesbaden
Mother	Agnes of Hesse

Adolph I, Count of Nassau-Wiesbaden-Idstein (1307 – 17 January 1370) was a son of Count Gerlach I and Agnes of Hesse. In 1344, his father abdicated in favor of his sons. They ruled jointly until 1355, then divided their inheritance:

• Adolph I inherited Nassau-Wiesbaden-Idstein (this line died out in the male line in 1605)
• John I inherited Nassau-Weilburg (this line died out in the male line in 1912)
• Rupert inherited Nassau-Sonnenberg (he died childless in 1390)

In 1322 Adolph married Margaret, the daughter of Frederick IV, Burgrave of Nuremberg. They had the following children:

• Gerlach II (1333–1386), inherited Nassau-Wiesbaden
• Frederick (d. 1376) was minister in Mainz
• Agnes (d. 1376), married Werner IV, Count of Wittgenstein
• John
• Margaret was abbess of Klarenthal Monastery
• Elisabeth (d. 1389), married in 1361 to Diether VIII, Count of Katzenelnbogen
• Adolph I of Nassau (1353–1390), Archbishop of Mainz from 1379
• John II (1353–1420), Archbishop of Mainz from 1397
• Anna was abbess of Klarenthal Monastery
• Walram IV (1354–1393), inherited Nassau-Idstein
• Catherine (d. 1403), married in 1373 to Reinhard IV, Count of Westerburg
• Frederick
• Walram II
• Joanna