William of Nassau
William of Nassau may refer to:
- William I, Count of Nassau-Siegen, William the Rich
- William the Silent, count of Nassau ; later Willem of Orange
- * Alternative title for Het Wilhelmus, the Dutch national anthem
- William of Nassau (1601–1627), grandson of the above
- William of Nassau (1620–1679), son of the above
- William, Count of Nassau-Siegen
- William of Nassau-Weilburg, duke of Nassau
- William I of the Netherlands, Count of Nassau, Prince of Nassau-Orange-Fulda, Prince of Orange-Nassau