Author
- Ibn al-Shatir2
- Ibrāhīm ibn Hibat Allāh Lakhmī2
- Ibrāhīm ibn Muṣṭafá Ḥalabī2
- Ibrāhīm ibn Ḥusayn2
- Ikhtiyār al-Dīn ibn Ghiyāth al-Dīn2
- Immanuel Bonfils2
- Immanuel Frances2
- Innocent V2
- Isaac ben Mordekhai Kimḥi2
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 13462
- Jacob ben Asher2
- Jacobus de Teramo2
- Jacopone da Todi2
- James of Lausanne2
- Jamāl al-Dīn Ḥaṣīrī2
- Jarmakī, Abū Bakr ibn al-Ṭāhir, 18th cent2
- Jayakr̥ṣṇa2
- Jayāditya2
- Jean Germain2
- Jews2