Author
- Isaac of Troki1
- Isaac the Blind1
- Isidore of Seville1
- Israel Alnaqua1
- Jacob Berab1
- Jacob ben Asher1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob ibn Habib1
- Jacobus de Voragine1
- James of Lausanne1
- Jerome1
- Joachim Heinrich Campe1
- John Chrysostom1
- John of Damascus1
- John of Seville ?1
- Joseph Nasi1
- Joseph ben Abraham Gikatilla1
- Joseph ben Gorion1
- Joseph ben Judah ibn Aknin1
- Joshua ben Israel Benveniste1