Author
- William IV, Landgrave of Hesse-Kassel1
- William Langland1
- William Lyndwood1
- William Perault1
- William of Auvergne1
- William of Montlauzun1
- William of Paris1
- William of Saliceto1
- William of Tyre1
- Ya'qub al-Jarkhi1
- Yaakov de Castro1
- Yajnavalkya1
- Yakov Sikily1
- Yamagata Daini1
- Yazıcıoğlu Mehmet1
- Yaʻaḳov Samut1
- Yaʻaḳov ben Daṿid ʻAntebi1
- Yaʻaḳov ben Ḳalonimus Segal1
- Yaʻqūb ibn Muḥammad Ṭāʼūsī1
- Yaʻqūb ibn ʻAlī Burūsawī1