- Ibn Nawbakht, Ibrāhīm, 10th cent. Yāqūt1
- Ibn Nujaym, Zayn al-Dīn ibn Ibrāhīm, -1563. Fatāwá al-Zaynīyah1
- Ibn Qaḍīb al-Bān, ʻAbd Allāh ibn Muḥammad, -1684 or 1685. Dālīyah1
- Ibn Quṭlūbughā, al-Qāsim ibn ʻAbd Allāh, 1399 or 1400-1474 or 1475. Ḥawālah1
- Ibn al-Fāriḍ, ʻUmar ibn ʻAlī, 1181 or 1182-12351
- Ibn al-ʻArabī, 1165-1240. Works1
- Ibn ʻAbd al-Razzāq, ʻAbd al-Raḥmān ibn Ibrāhīm, -1727. Qalāʻid al-manẓūm1
- Ibn ʻAllān, Muḥammad ʻAlī ibn Muḥammad, 1588-1648. Ḍawābiṭ al-taqṭīʻ1
- Ibn ʻĀbidīn, Muḥammad Amīn ibn ʻUmar, 1783 or 1784-1836. ʻUqūd rasm al-muftī1
- Imaginary letters1
- Imām al-Ḥaramayn al-Juwaynī, ʻAbd al-Malik ibn ʻAbd Allāh, 1028-1085. Irshād ilá qawāṭiʻ al-adillah fī uṣūl al-iʻtiqād1
- India1
- India--Hyderabad1
- Intention--Religious aspects--Islam1
- Iran--Qazvīn1
- Iran--Shīrāz1
- Iraq1
- Iraq--Kāẓimīyah1
- Ishārāt wa-al-tanbīhāt (Avicenna)1
- Islam--Apologetic works1