Author
- Hüseyn Uşaki1
- Hāmī, Ibrāhīm1
- Ibn Abī Sharīf1
- Ibn Rajab1
- Ibrāhīm ibn Muḥammad ʻIṣām al-Asfarāyīnī1
- Isaac the Blind1
- Isidore of Seville1
- Jacob Anatoli1
- Jacob Berab1
- Jacob Israel Karmi1
- Jacob Meyer1
- Jacob ben Hayyim Zemah1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jalal al-Din al-Suyuti1
- Jerome de Prado1
- Johannes ab Indagine1
- John XXII1
- Josef ibn Tabul1
- Joseph ben Gorion1
- Joseph ben Judah ibn Aknin1