- Jewish religious poetry, Ladino1
- Jewish sermons, Italian1
- Jewish sermons, Yiddish1
- Jews--Folklore1
- Jidd Ḥafṣī, ʻAlī ibn Luṭf Allāh, active 17th century-18th century1
- Jinn1
- Judeo-Arabic literature1
- Jāmiʻ al-ṣaḥīḥ (Muslim ibn al-Ḥajjāj al-Qushayrī)1
- 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
- Kanz al-daqāʼiq (Nasafī, ʻAbd Allāh ibn Aḥmad)1
- Karaite calendar1
- Karaite philosophy1
- Karaites--Doctrines1
- Karaitic literature1
- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Kashmir Śaivism--Doctrines1
- Kavaca1
- Kaʻb al-Aḥbār, -655 or 6561