See William (name) for information about the name.

Royalty

• William of Albania, reigning king/prince
• King William I of Bimbia, king of the Isubu
• King William II of Bimbia, son of above
• King William I of England (William the Conqueror, William the Bastard)
• King William II of England
• King William III of England (Prince William III of Orange, King William II of Scotland, William of Orange)
• Emperor William I of Germany
• Emperor William II of Germany
• William I, Count of Holland (see also William of Holland)
• William II, Count of Holland
• William III, Count of Holland
• William IV, Count of Holland
• William V, Count of Holland
• William VI, Count of Holland
• King William I of the Netherlands
• King William II of the Netherlands
• King William III of the Netherlands
• Prince William I of Orange (William the Silent)
• Prince William II of Orange
• Prince William III of Orange (King William III of England)
• Prince William IV of Orange
• Prince William V of Orange
• Count William of Poitiers
• King William I of Scotland (William the Lion)
• King William II of Scotland (King William III of England)
• King William I of Sicily
• King William II of Sicily
• King William III of Sicily
• King William IV of the United Kingdom
• Prince William of Wales
• Prince William II Villehardouin
• Duke William IV "The Rich" of Cleves
• William, Archbishop of Mainz
• William, Count of Poitiers

Philosophers, theologians, and saints

• William of Auxerre (d. 1231), theologian
• William of Champeaux (1070 - 1121), theologian
• William de Corbeil, English bishop
• William of Conches (1080 - 1154), philosopher
• William of Gellone, saint
• William of Mainz, German bishop
• William of Malmesbury, English historian
• William of Moerbeke (1215 - 1286)
• William of Norwich (1132 - 1144), saint and supposed martyr
• William of Ockham, English friar, philosopher and originator of Occam's Razor
• William of Sodor and Man, 11th Bishop of Sodor and Man
• William de la Pole, English nobleman
• William of St. Carilef, English bishop
• William of St. Thierry (1085 - 1148), theologian
• William of Tyre, Bishop in the Holy Land
• William Waynflete (1395 - 1486), bishop
• William of Wied, German nobleman
• William of Wykeham, English bishop
• Saint William of York, English bishop

Others:

• William, bishop of Zaragoza (Spain) in 1137.

Also, will.i.am of The Black Eyed Peas appears to come from "William".

William

Wilhelm | Guillaume | Gulielmus | Willem | ウィリアム | William | Wilhelm | 威廉