William of Orange

William of Orange usually refers to either:
William the Silent, William I, (1533–1584), Prince of Orange, founder of the House Orange-Nassau and the Netherlands as a state
William III of England, William III of Orange-Nassau, William II of Scotland, (1650–1702)

William of Orange may also refer to:

Middle Ages
 Saint William of Gellone (755—c.812), courtier of Charlemagne who defeated the Saracens at Orange
 William, Bishop of Orange joined the First Crusade. After the death of Adhemar of Le Pu