Adolph I, Count of Nassau-Wiesbaden-Idstein

{{Unreferenced|date=September 2021}}

{{short description|German nobleman}}

{{Infobox noble

| name = Adolph I, Count of Nassau-Wiesbaden-Idstein

| image = Tekening van het grafmonument van Adolf I van Nassau-Wiesbaden en Margarethe van Neurenberg.jpg

| caption =

| noble family = Nassau

| father = Gerlach I of Nassau-Wiesbaden

| mother = Agnes of Hesse

| spouse = Margaret of Nuremberg

| birth_date = {{birth year|1307}}

| birth_place =

| death_date = {{death date and age|1370|1|17|1307|df=y}}

| death_place =

}}

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)