- Ibn al-Sarrāj, Aḥmad ibn Abī Bakr, active 14th century1
- Ibn al-ʻArabī, 1165-12401
- Illustrated works1
- Imāmʹzādah, Muḥammad ibn Abī Bakr, 1097 or 1098-1177 or 1178. Shirʻat al-Islām1
- Ishrāqīyah1
- Islam--Customs and practices1
- Islam--Rituals1
- Islamic civilization1
- Iṣfahānī, Maḥmūd ibn ʻAbd al-Raḥmān, 1275 or 1276-1348 or 1349. Tashyīd al-Qawāʻid1
- Iẓhār al-asrār (Birgivî Mehmet Efendi)1
- Judgment Day (Islam)1
- Khalwatīyah1
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)1
- Language and languages--Philosophy1
- Loans (Islamic law)1
- Logic, Medieval1
- Magic squares1
- Maṣābīḥ al-sunnah (Baghawī, al-Ḥusayn ibn Masʻūd)1
- Mevleviyeh1
- Mihrabs1