John III of Nassau may refer to:
- John III, Count of Nassau-Beilstein (1495-1561)
- John III, Count of Nassau-Saarbrücken (1511-1574)
- John III, Count of Nassau-Siegen (died 1430)
- John III, Count of Nassau-Weilburg (1441-1480)
This disambiguation page lists articles about people with the same name.
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