Author
- Ibrāhīm ibn ʻAlī Ṭaraṣūṣī1
- Ikhtiyār al-Dīn ibn Ghiyāth al-Dīn1
- Imad al-Din Mahmud ibn Mas‘ud Shirazi1
- Inayet Efendi1
- Isaac Luria1
- Isaac Newton1
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 13461
- Isḥāq1
- Isḥāq ibn Yūsuf Ṣardafī1
- Izz al-Din ibn 'Abd al-Salam1
- Jacob Berab1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jean-François Roussin1
- Joannes Oliva1
- John Skyrrow1
- Josef ibn Tabul1
- Joseph ben Abraham Gikatilla1
- Joseph ben Gorion1
- Joshua ibn Shuaib1
- Juan Ortiz Campoy1