William VI

William VI may refer to:

• William VI, Duke of Aquitaine (1004–1038)
• William VI, Count of Auvergne (1096–1136)
• William VI of Montpellier (before 1120–after 1161)
• William VI, Marquess of Montferrat (–1226)
• William II, Duke of Bavaria (died 1417), also William VI of Holland
• William the Younger, Duke of Brunswick-Lüneburg (1535–1592)
• William VI, Landgrave of Hesse-Kassel (or Hesse-Cassel) (1629–1663)
• William I of the Netherlands (1772–1843), also William VI of Orange

See also

• King William (disambiguation)
• Prince William (disambiguation)
• List of people named William#Royalty and nobility