- Ibn al-Hāʼim, Aḥmad ibn Muḥammad, d. 1412. Tuḥfah al-qudsīyah fī al-farāʼiḍ1
- Ibn al-Muṭahhar al-Ḥillī, al-Ḥasan ibn Yūsuf, 1250-1325. Tahdhīb al-wuṣūl ilá ʻilm al-uṣūl1
- Ibn al-Najjār, Taqī al-Dīn Muḥammad ibn Aḥmad, 1492 or 3-1564 or 5. Muntahá al-irādāt1
- Ibn al-Qāḍī, ʻAbd al-Raḥmān ibn Abī al-Qāsim, 1590 or 1591-1671 or 1672. Khilāf wa-al-tashhīr wa-al-istiḥsān1
- Ibn al-Shahīd al-Thānī, al-Ḥasan, 1551or 2-1602 or 3. Maʻālim al-dīn wa-malādhdh al-mujtahidīn1
- Ibn al-Shihnah, Abū al-Walīd Muḥammad ibn Muḥammad, 1348-1412. Manẓūmah fī al-farāʼiḍ1
- Ibn al-Uqlīshī, Aḥmad ibn Maʻadd, -1155 or 11561
- Ibn ḥajar al-Haythamī, Aḥmad ibn Muḥammad, approximately 1503-approximately 15666. Iʻlām li-qawāṭiʻ al-Islām1
- Ijtihād (Islamic law)1
- Illumination of books and manuscripts1
- Illumination of books and manuscripts, Arab1
- Illustrated works1
- Imamate1
- Imāmʹzādah, Muḥammad ibn Abī Bakr, 1097 or 1098-1177 or 1178. Shirʻat al-Islām1
- India--Hyderabad1
- Interest (Islamic law)1
- Iqnāʼ (Ḥujāwī, Mūsá ibn Aḥmad)1
- Iqtirāḥ fī ʻilm uṣūl al-naḥw wa-jadalih (Suyūṭī)1
- Iraq--Mosul1
- Ishārāt wa-al-tanbīhāt (Avicenna)1