- Ibn al-Hāʼim, Aḥmad ibn Muḥammad, -1412. Lumaʻ al-yasīrah fī ʻilm al-ḥisāb2
- Ibn al-Jazarī, Muḥammad ibn Muḥammad, 1350-1429. Arbaʻūn masʼalah min masāʼil muskhilah2
- Indexes2
- Intellect--Religious aspects--Islam2
- Iran--Tabrīz2
- Iraq2
- Islam--Apologetic works2
- Islam--Terminology2
- Islamic heresies2
- Islamic interpretations of sacred works2
- Islamic legends2
- Isnawī, ʻAbd al-Raḥīm ibn al-Ḥasan, 1305-1370. Sharḥ al-Minhāj2
- Italy--Sicily2
- Iḥyāʼ ʻulūm al-dīn (Ghazzālī)2
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tasdīd al-qawāʼid fī sharḥ Tajrīd al-ʻaqāʼid2
- Jaʻbarī, Arslān ibn Yaʻqūb, -1300. Risālat al-tawḥīd2
- Jaʻbarī, Ṣāliḥ ibn Thāmir, d. 1306. Naẓm al-laʼālī2
- Jinn2
- Judaism--Liturgy2
- Judaism--Liturgy--Texts2