- Ismāʻīl ibn ʻAbd Allāh, 1792 or 1793-18631
- Israel--Acre1
- Iʻrāb ʻan qawāʻid al-iʻrāb (Ibn Hishām, ʻAbd Allāh ibn Yūsuf)1
- Jawharat al-tawḥīd (Laqānī, Ibrāhīm ibn Ibrāhīm)1
- Joseph (Son of Jacob)1
- Joseph (Son of Jacob) in the Qurʼan1
- Jāmiʻ al-ṣaghīr (Suyūṭī)1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- Jāmī, 1414-14921
- Jārabardī, Aḥmad ibn al-ḥusayn, d. 1346. Sharḥ al-Shāfiyah1
- Kabāʼir (Muḥammad ibn ʻAbd al-Wahhāb)1
- Khabīṣī, Muḥammad ibn Abī Bakr, active 14th century. Muwashshaḥ1
- Khamrīyah (Ibn al-Fāriḍ, ʻUmar ibn ʻAlī)1
- Khiḍr (Legendary character)1
- Khūjahʹzādah, ʻAbd al-Naṣīr ibn ʻAbd Allāh, active 16th century. Taḥrīrāt ʻalá al-Ṭarīqah al-Muḥammadīyah1
- Kings and rulers1
- Kings and rulers--Duties1
- Kinship (Islamic law)1
- Kisāʼī, ʻAlī ibn Ḥamzah, -804 or 8051
- Knowledge, Theory of (Islam)1