William III

William III may refer to:

• William III of Aquitaine (915–963)
• William III of Toulouse (died 1037)
• William III of Provence (died after 1037)
• William III of Montferrat (970–1042)
• William III of Angoulême (1084–1118)
• William III of Ponthieu (c. 1095–1172)
• William III, Count of Burgundy (1110–1127)
• William III of Sicily (1190–1198)
• William III of Dampierre (1224–1251)
• William III of Cagliari (ruled 1256–1258)
• Sir William Douglas the Hardy (died c. 1298)
• William I, Count of Hainaut or William III of Holland (1286–1337)
• Uilleam III, Earl of Ross (died 1370)
• William I, Duke of Bavaria or William III of Hainaut (1330–1389)
• William III, Duke of Bavaria (1375–1435)
• William III, Duke of Luxembourg (1425–1482)
• William III of England or William III of Orange or William II of Scotland (1650–1702)
• William III of the Netherlands (1817–1890)

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