Author
- Walerand ap Adam1
- Walter Burley1
- Walter Map1
- Wernigerode1
- William Babington1
- William Bonyngton1
- William Brito1
- William Lee1
- William Perault1
- William Rothwell1
- William de Montibus1
- William of Auxerre1
- William of Montlauzun1
- William of Ockham1
- William of Pagula1
- Xenophon1
- Yaḥyá ibn Aḥmad Kāshānī1
- Zayn al-Din Gorgani1
- knight of the Teutonic Order1
- Étienne de Poncher1