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) stadtholder of the Dutch Republic

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 Puy, he was recognized as leader of the clergy

William of Orange in the House of Baux and the House of Chalon-Arlay

 * William I of Baux (c. 1155 – 1218)
 * William II of Baux (died 1239)
 * William III of Baux (died 1256)
 * William VII of Chalon (c. 1415 – 1475)

United Provinces of the Netherlands

 * William II, Prince of Orange (1626–1650), stadtholder of the United Provinces of the Netherlands from 1647
 * William IV, Prince of Orange (1711–1751), first hereditary stadtholder of the Netherlands
 * William V, Prince of Orange (1748–1806), last Stadtholder of the Dutch Republic and leader of the conservative faction

Kingdom of the Netherlands

 * William I of the Netherlands (1775–1843) also known as William Frederik of Orange-Nassau or William VI of Orange before his accession
 * William II of the Netherlands (1792–1849) (The Prince of Orange who fought at the Battle of Waterloo, sometimes known as William VII)
 * William III of the Netherlands (1817–1890), King of the Netherlands and Grand Duke of Luxembourg
 * William, Prince of Orange, eldest son of William III, died before his father and therefore never succeeded as king
 * Willem-Alexander, King of the Netherlands, current King of the Netherlands, eldest child of former Queen Beatrix

Other

 * William of Orange (pigeon), pigeon used by British military in Battle of Arnhem in September 1944