Author
- Iacopo da Benevento1
- Innocent III1
- Innocent IV1
- Innocent XI1
- Isaac Alfasi1
- Isaac Israeli ben Joseph1
- Isaac of Troki1
- Israel Sarug1
- Jabir ibn Hayyan1
- Jacob Israel Karmi1
- Jacob Saphir1
- Jacob ben David ben Yom Tov1
- Jacob ben Jacob, ha-Kohen, -approximately 12701
- Jacobus de Cessolis1
- Jacopo Ragone1
- Jacopone da Todi1
- Jacques de Vitry1
- James of Viterbo1
- Jean de Roquetaillade1
- Jewish Community of Pitigliano, Italy1