| William Howard Taft | William Howard Taft |
| William Huggins | William Huggins |
| William Hurt | William Hurt |
| William Hyde Wollaston | William Hyde Wollaston |
| William I | Guillaume Ier d'Allemagne |
| William I of England | Guillaume le Conquérant |
| William I of Montferrat | Guillaume le Conquérant |
| William I of Normandy | Guillaume Ier de Normandie |
| William I of Provence | Guillaume Ier de Provence |
| William I of Sicily | Guillaume Ier de Sicile |
| William I of the Netherlands | Guillaume Ier des Pays-Bas |
| William I of Württemberg | Guillaume Ier de Wurtemberg |
| William II | Guillaume II d'Allemagne |
| William II of Aquitaine | Guillaume II des Pays-Bas |
| William II of Dampierre | Guillaume II de Dampierre |
| William II of Holland | Guillaume Ier du Saint-Empire |
| William II of Provence | Guillaume II de Provence |
| William II of Sicily | Guillaume II de Sicile |
| William II of the Netherlands | Guillaume II des Pays-Bas |
| William II of Villehardouin | Guillaume II de Villehardouin |
| William II of Württemberg | Guillaume II de Wurtemberg |
| William II Sánchez of Gascony | Guillaume Sanche |
| William III | Guillaume III |
| William III of Aquitaine | Guillaume III de Poitiers |
| William III of Dampierre | Guillaume III de Dampierre |
| William III of Ponthieu | Guillaume Ier Ponthieu |
| William III of Provence | Guillaume III de Provence |
| William III of Sicily | Guillaume III de Sicile |
| William III of the Netherlands | Guillaume III des Pays-Bas |
| William III of Toulouse | Guillaume III des Pays-Bas |
| William Iron Arm | Guillaume Bras-de-Fer |
| William IV | Guillaume IV |
| William IV of Aquitaine | Guillaume IV de Poitiers |
| William IV of Ponthieu | Guillaume II de Ponthieu |
| William IV of Provence | Guillaume IV de Provence |
| William IV of the United Kingdom | Guillaume IV du Royaume-Uni |
| William IV of Toulouse | Guillaume IV du Royaume-Uni |
| William IX of Aquitaine | Guillaume IX de Poitiers |
| William Jackson Hooker | William Jackson Hooker |
| William James | William James |
| William James Sidis | William James Sidis |
| William Jennings Bryan | William Jennings Bryan |
| William Jones | William Jones |
| William Joseph Chaminade | Guillaume Chaminade |
| William Joseph Donovan | William Joseph Donovan |
| William Kamm | William Kamm |
| William Kapell | William Kapell |
| William Kemmler | William Kemmler |
| William Kidd | William Kidd |
| William Kirby | William Kirby |
| William Langland | William Langland |
| William Lassell | William Lassell |
| William Lawrence Bragg | William Lawrence Bragg |
| William Levada | William Joseph Levada |
| William Lipscomb | William Nunn Lipscomb |
| William Luther Pierce | William Luther Pierce |
| William Makepeace Thackeray | William Makepeace Thackeray |
| William Martin Leake | William Martin Leake |
| William McKinley | William McKinley |
| William McMaster Murdoch | William McMaster Murdoch |
| William Miller | William Miller |
| William Morgan | William Morgan |
| William Morris | William Morris |
| William Moseley | William Moseley |
| William Nylander | Wilhelm Nylander |
| William Oefelein | William Oefelein |
| William of Blois | Guillaume de Boulogne |
| William of Brandenburg | Guillaume de Prusse |
| William of Champeaux | Guillaume de Champeaux |
| William of Conches | Guillaume de Conches |
| William of Gellone | Guillaume de Gellone |
| William of Jumièges | Guillaume de Jumièges |
| William of Malmesbury | Guillaume de Malmesbury |
| William of Moerbeke | Guillaume de Moerbeke |
| William of Ockham | Guillaume d'Ockham |
| William of Poitiers | Guillaume de Poitiers |
| William of Rubruck | Guillaume de Rubrouck |
| William of Tudela | Guillaume de Tudèle |
| William of Tyre | Guillaume de Tyr |
| William of Volpiano | Guillaume de Volpiano |
| William Orbit | William Orbit |
| William Oughtred | William Oughtred |
| William Paley | William Paley |
| William Patrick Hitler | William Patrick Hitler |
| William Penn | William Penn |
| William Peter Blatty | William Peter Blatty |
| William Petty | William Petty |
| William Phillips | William Phillips |
| William Pitt the Younger | William Pitt le Jeune |
| William Quantrill | William Quantrill |
| William Ramsay | William Ramsay |
