Author
- Imam Birgivi1
- Innocent III1
- Isaac Israeli ben Solomon1
- Ismail ibn Hammad al-Jawhari1
- Jacobus de Voragine1
- Jacopone da Todi1
- Jacques Bruyant1
- Jalal al-Din Davani1
- Jalal al-Din al-Suyuti1
- Jean Barthélémy1
- Jean de Wavrin1
- Jerome1
- Johannes Milis1
- Johannes de Sacrobosco1
- John Chrysostom1
- John Dominici1
- John Larry England1
- John Lydgate1
- John of Saxony1
- John of Wales1