Author
- Hai Gaon1
- Ibrāhīm al-Ḥalabī1
- Immanuel Bonfils1
- Isaac Alfasi1
- Isaac of Troki1
- Isaac the Blind1
- Israel Alnaqua1
- Issachar ben Mordecai ibn Susan1
- Jacob Berab1
- Jacob ben Asher1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacob ibn Habib1
- Joachim Heinrich Campe1
- John of Seville ?1
- Joseph Nasi1
- Joseph ben Abraham Gikatilla1
- Joshua ben Israel Benveniste1
- Joshua ibn Shuaib1
- Judah Leib Prossnitz1
- Judah ben Saul ibn Tibbon1