William IV

• William II, Count of Hainaut
• William II, Duke of Bavaria
• William IV of Provence
• William IV of the United Kingdom
• William IV, Count of Jülich
• William IV, Count of Nevers
• William IV, Count of Ponthieu
• William IV, Count of Toulouse
• William IV, Duke of Aquitaine
• William IV, Duke of Bavaria
• William IV, Duke of Brunswick-Lüneburg
• William IV, Grand Duke of Luxembourg
• William IV, Landgrave of Hesse-Kassel
• William IV, Lord of Douglas
• William IV, Marquess of Montferrat
• William IV, Prince of Orange
• William, Duke of Jülich-Cleves-Berg
• William, Margrave of Meissen