- Kabāʼir (Muḥammad ibn ʻAbd al-Wahhāb)1
- Kaffawī, Muḥammad ibn Ḥumayd, -1760 or 1761. Ādāb al-baḥth1
- Kalbī, Diḥyah ibn Khalīfah, -approximately 6701
- Karaite calendar1
- Karaite philosophy1
- Karaites--Controversial literature1
- Karaites--Doctrines1
- Kardarī, Ibn al-Bazzāz, -1424. Fatāwá al-Bazzāzīyah1
- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Karo, Joseph ben Ephraim, 1488-15751
- Karshuni1
- Kashmir Śaivism--Doctrines1
- Kavaca1
- Kavvanot (Cabala)1
- Kaydānī. Maṭālib al-muṣallī1
- Kaʻb al-Aḥbār, -655 or 6561
- Kaʻbah (Mecca, Saudi Arabia)1
- Kedushah1
- Kedushah. Rosh ha-Shanah1
- Kekchi language1