Author
- Ibrāhīm ibn Ḥusayn2
- Ikhtiyār al-Dīn ibn Ghiyāth al-Dīn2
- Immanuel Frances2
- Isaac Newton2
- Isaac ben Mordekhai Kimḥi2
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 13462
- Ishmael ben Abraham Isaac ha-Kohen2
- Jacob ben Asher2
- Jacobus de Teramo2
- Jagadīśatarkālaṅkāra2
- Jalal Al-Din Al-Khabazi2
- Jamāl al-Dīn Ḥaṣīrī2
- Jarmakī, Abū Bakr ibn al-Ṭāhir, 18th cent2
- Johann Herolt2
- Johannes Nider2
- John of Wales2
- Josef ibn Tabul2
- Joshua Benzion Segre2
- Judah Leib Pukhovitser2
- Judah Rosanes2