Author
- Immanuel Bonfils1
- Innocent IV1
- Isaac Albalag1
- Isaac Israeli ben Joseph1
- Isaac Israeli ben Solomon1
- Isaac ibn Ezra1
- Isaac ibn Ghiyyat1
- Isidore of Seville1
- Ismail ibn Hammad al-Jawhari1
- Ivo of Chartres1
- Jacob HaLevi of Marvège1
- Jacobus Balbi1
- Jacobus Dinetus1
- Jacobus de Voragine1
- Jacopo Nannis de Piccolomini1
- Jacopo Ragone1
- Jacques Lempereur1
- Jacques Millet1
- Jagannāth, Svāmī1
- Jagannātha Dīkṣita (Son of Yādava Dīkṣita)1