- Islamic magic1
- Islamic rosary1
- Islamic sects1
- Ismāʻīl ibn ʻAbd Allāh, 1792 or 1793-18631
- Isra' and Mi`raj of the Prophet Muhammad1
- Iʻrāb ʻan qawāʻid al-iʻrāb (Ibn Hishām, ʻAbd Allāh ibn Yūsuf)1
- Iẓhār al-asrār (Birgivî Mehmet Efendi)1
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jārūdī, Nāṣir ibn Muḥammad, active 18th century1
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Risālat al-Tawḥīd1
- Kabāʼir (Muḥammad ibn ʻAbd al-Wahhāb)1
- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Khabīṣī, Muḥammad ibn Abī Bakr, active 14th century. Muwashshaḥ1
- Khalwatīyah1
- Kharijites1
- Khiḍr (Legendary character)1
- Kisāʼī, ʻAlī ibn Ḥamzah, -804 or 8051
- Knowledge, Theory of (Islam)1
- Language and languages--Philosophy1
- Leather doublures1