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'William IV' may refer to:

★ William IV of Aquitaine (937–994).

★ William IV of Provence (died 1030).

★ William, Margrave of Meissen (died 1062), also William IV of Weimar.

★ William IV of Toulouse (c. 1040–1094).

★ William IV of Montferrat (1030–1100).

★ William IV of Ponthieu (1179–1221).

★ William IV, Lord of Douglas (died 1333).

★ William II, Count of Hainaut (1307–1345), also William IV of Holland.

★ William II, Duke of Bavaria-Straubing (ruled 1404–1417), also William IV of Hainault.

★ William IV, Duke of Brunswick-Lüneburg (died 1495 or 1503).

★ William IV, Duke of Bavaria (1493–1550).

★ Wilhelm, Duke of Jülich-Cleves-Berg (1516–1592).

★ William IV, Landgrave of Hesse-Kassel (1532–1592).

★ William IV, Prince of Orange (1711–1751).

★ William IV of the United Kingdom (1765–1837).

★ William IV, Grand Duke of Luxembourg (1852–1912).

★ A possible regnal name for Willem-Alexander, Prince of Orange (born 1967), if and when he succeeds to the throne of the Netherlands.