- Ibn al-Muṭahhar al-Ḥillī, al-Ḥasan ibn Yūsuf, 1250-1325. Mabādiʼ al-wuṣūl ilá ʻilm al-uṣūl1
- Ibn al-Nāẓim, Muḥammad ibn Muḥammad, d. 1287 or 8. Sharḥ al-Alfīyah1
- Ibn al-Shahīd al-Thānī, al-Ḥasan, 1551 or 1552-1602 or 1603. Maʻālim al-dīn wa-malādhdh al-mujtahidīn1
- Ibn al-ʻArabī, 1165-12401
- Ibrāhīm ibn Adʹham, -approximately 7771
- Idra zuta1
- Ijtihād (Islamic law)1
- Illumination of books and manuscripts, Arab1
- Imamate1
- Incantations, Hebrew1
- India--Delhi1
- India--Hyderabad1
- India--Kerala1
- India--Tirupati1
- Inheritance and succession (Jewish law)1
- Initials (Abbreviations)1
- Ink stamps1
- Intellect--Religious aspects--Islam1
- Interest (Islamic law)1
- International relations1