- Iran--Ardabīl1
- Iran--Tabrīz1
- Iraq--Karbalāʼ1
- Irshād al-adhhān ilá aḥkām al-īmān (Ibn al-Muṭahhar al-Ḥillī, al-Ḥasan ibn Yūsuf)1
- Isbījābī, Aḥmad ibn Manṣūr, -approximately 1087. Sharḥ al-Mukhtaṣar fī al-fiqh1
- Islam and politics1
- Islamic New Year1
- Islamic cosmology1
- Islamic heresies1
- Islamic interpretations of Jesus Christ1
- Islamic poetry, Arabic1
- Islamic sermons1
- Ismāʻīl ibn ʻAbd Allāh, 1792 or 1793-18631
- Isnawī, ʻAbd al-Raḥīm ibn al-Ḥasan, 1305-13701
- Israel--Tsefat1
- Istiṣḥāb (Islamic law)1
- Jammāʻīlī, ʻAbd al-Ghanī ibn ʻAbd al-Wāḥid, 1146-12031
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jinn1
- Judges (Islamic law)1