William II may refer to:
- William II of Aquitaine (died 926)
- William II of Montferrat (died c. 961)
- William II Sánchez of Gascony (died after 996)
- William II of Provence (c. 987–1019)
- William II of Besalú (died 1066)
- William I of England (c. 1028–1087), also William II of Normandy
- William II of England (c. 1056–1100)
- William III of England (1650–1702), also known as William II of Scotland
- William-Jordan (died 1109), also William II of Cerdanya
- William II, Duke of Apulia (1095–1127)
- William de Warenne, 2nd Earl of Surrey (died 1138)
- William II of Nevers (1098–1147)
- William II of Bures (died 1158)
- William II of Sicily (1153–1189)
- William II of Dampierre (1196–1231)
- William II Longespee (c. 1204–1250)
- William II of Cagliari (died 1254)
- William II of Holland (1228–1256)
- William II of Agen, 13th century Latin Patriarch of Jerusalem
- William II of Villehardouin (died 1278)
- William de Wickwane, Archbishop of York (1279–1285)
- William II de Soules (died c. 1320)
- Uilleam II, Earl of Ross (ruled 1274–1323)
- William II of Athens (1312–1338)
- William II, Count of Hainaut (1307–1345)
- William II, Duke of Bavaria-Straubing (ruled 1404–1417)
- Guillaume d'Estouteville (1403–1483)
- William II, Landgrave of Hesse (1469–1509)
- William II de la Marck (1542–1578)
- William II, Prince of Orange (1626–1650)
- William III of England (1650–1702), also William II of Scotland
- William II of the Netherlands (1792–1849)
- William II of Bimbia (died 1882), popularly known as Young King William
- William II of Württemberg (1848–1921).
- William II, German Emperor (1859–1941)
Famous quotes containing the word william:
“It’s a pity you didn’t know when you started your game of murder, that I was playing, too.”
—Robb White, and William Castle. Frederick Loren (Vincent Price)