- Ismāʻīl II, Shah of Iran, 1533 or 1534-15771
- Ismāʻīl ibn ʻAbd Allāh, 1792 or 1793-18631
- Isnawī, ʻAbd al-Raḥīm ibn al-Ḥasan, 1305-13701
- Italy--Ferrara1
- Italy--Florence1
- Italy--Mantua1
- Italy--Morimondo1
- Italy--Naples1
- Italy--Prato1
- Italy--Siena1
- Izmīrī, Muṣṭafá ibn Rajab, active 17th century1
- Iṣbāḥ1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-ʻaqāʾid fī sharḥ Tajrīd al-qawāʻid1
- Jahmīyah1
- 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
- Jews1
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1