William III

William III may refer to:

Kings

• William III of Sicily (1190–1198)
• William III of England or William III of Orange or William II of Scotland (1650–1702)
• William III of the Netherlands and Luxembourg (1817–1890)

Nobles

• William III, Duke of Aquitaine (915–963)
• William II, Count of Provence, also numbered William III of Provence, (c. 981 – 1018)
• William III, Count of Toulouse, also styled William III of Provence (died 1037)
• William III, Marquess of Montferrat (970–1042)
• William III, Lord of Montpellier (died 1058)
• William V, Count of Angoulême, also known as William Taillefer III (1084–1118)
• William III, Count of Ponthieu (c. 1095 – 1172)
• William III, Count of Burgundy (1110–1127)
• William II, Count of Flanders, also styled William III of Dampierre (1224–1251)
• William III Giudice of Cagliari (ruled 1256–1258)
• William I, Count of Hainaut or William III of Holland (1286–1337)
• William III, Earl of Ross, known as Uillearn, 5th 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, Landgrave of Thuringia (1425–1482)

See also

• William (disambiguation)