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Wilhelm II was German emperor and King of Prussia from 1888 to 1918.
Wilhelm II may also refer to:
- William II of Isenburg-Wied (reigned 1383–88)
- William II, Duke of Bavaria (reigned 1404–17)
- William II, Landgrave of Hesse (reigned 1493–1509)
- William II, Elector of Hesse (reigned 1821–47)
- William II of Württemberg (reigned 1891–1918)