William VI

• William VI, [Duke of Aquitaine]
• William VI, [Count of Auvergne]
• William VI of Montpellier
• William VI, [Marquess of Montferrat]
• William [II, Duke of Bavaria], also William VI of Holland
• William the [Younger, Duke of Brunswick-Lüneburg]
• William VI, [Landgrave of Hesse-Kassel]
• William I of the Netherlands, also William VI of Orange