Author
- Ibrāhīm ibn Muṣṭafá Ḥalabī2
- Ibrāhīm ibn Ḥusayn2
- Immanuel Frances2
- Isaac Newton2
- Isaac ben Mordekhai Kimḥi2
- Ishmael ben Abraham Isaac ha-Kohen2
- Jacob ben Asher2
- Jacobus de Teramo2
- Jagadīśatarkālaṅkāra2
- Jamāl al-Dīn Ḥaṣīrī2
- Jehiel ben Jekuthiel ben Benjamin Anav2
- Johann Herolt2
- Johannes Nider2
- John of Wales2
- Josef ibn Tabul2
- Joshua Benzion Segre2
- Judah Leib Pukhovitser2
- Judah Rosanes2
- Judah ben Saul ibn Tibbon2
- Jérôme Lalande2