Author
- Gregory I1
- Hunayn ibn Ishaq1
- Immanuel Bonfils1
- Isaac of Troki1
- Isaac the Blind1
- Isidore of Seville1
- Israel Alnaqua1
- Issachar ben Mordecai ibn Susan1
- Jacob Berab1
- Jacob ben Asher1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob ibn Habib1
- Jerome1
- Joseph Nasi1
- Joseph ben Abraham Gikatilla1
- Joseph ben Judah ibn Aknin1
- Joshua ben Israel Benveniste1
- Joshua ibn Shuaib1
- Judah Leib Prossnitz1
- Leʼon di Belentish1