- Iran--Qazvīn2
- Iraq2
- Isfarāyīnī, Muḥammad ibn Muḥammad, d. 1285. Lubāb al-iʻrāb2
- Islam--Apologetic works2
- Islam--Terminology2
- Islamic (culture or style)2
- Islamic heresies2
- Islamic illumination of books and manuscripts2
- Islamic interpretations of sacred works2
- Islamic law--Language2
- Islamic legends2
- Islamic literature, Arabic2
- Islamic religious education2
- 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
- Jawī Zādah, Muḥammad ibn Ilyās, -1547 or 1548. Risālah fī al-masḥ ʻalá al-khuffayn2
- Jaʻbarī, Ṣāliḥ ibn Thāmir, d. 1306. Naẓm al-laʼālī2
- Jinn2