- Italy--Prato1
- Italy--Siena1
- Izmīrī, Muṣṭafá ibn Rajab, active 17th century1
- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)1
- Iṣbāḥ1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʾid fī sharḥ Tajrīd al-qawāʻid1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tashyīd al-Qawāʻid1
- Jammāʻīlī, ʻAbd al-Ghanī ibn ʻAbd al-Wāḥid, 1146-12031
- Jamʻ bayna al-ṣaḥīḥayn (Ḥumaydī, Muḥammad ibn Fattūḥ)1
- Jawharat al-tawḥīd (Laqānī, Ibrāhīm ibn Ibrāhīm)1
- Jawshan al-kabīr1
- Jesus Christ1
- Jews1
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221? Qānūnchah1
- Jighmīnī, Maḥmūd ibn Muḥammad, -1221?. Qānūnchah1
- Judas Iscariot1
- Juhd al-muqill (Sājaqlīzādah, Muḥammad ibn Abī Bakr)1
- Julian, of Eclanum, Bishop, 380-approximately 4551
- Jurisprudence1