- Islamic occultism1
- Islamic stories, Arabic1
- Istiṣḥāb (Islamic law)1
- Italy--Sicily1
- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)1
- Iṣbāḥ1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Maṭāliʻ al-anẓār1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-qawāʼid fī sharḥ Tajrīd al-ʻaqāʼid1
- Jabbārīyah1
- Jahmīyah1
- Jawharī, Ismāʻīl ibn Ḥammād, -1003? Tāj al-lughah wa-ṣiḥāḥ al-ʻArabīyah1
- Jawshan al-kabīr1
- Jaʻbarī, Arslān ibn Yaʻqūb, -1300. Risālat al-tawḥīd1
- Jewish Rebellion (66-73 A.D.)1
- Jews1
- Jinn1
- John, the Baptist, Saint1
- Joseph (Son of Jacob)1
- Joseph (Son of Jacob) in the Qurʼan1
- Judaism1