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- Kaʻb al-Aḥbār, -655 or 6561
- Khabīṣī, Muḥammad ibn Abī Bakr, active 14th century. Muwashshaḥ1
- Khalwatīyah1
- Khalīl ibn Isḥāq al-Jundī, -1365? Mukhtaṣar Bāb al-yamīn1
- Khamti language1
- Kharijites1
- Khādimī, Muḥammad ibn Muṣṭafá, 1701 or 2-1762 or 3. Majāmiʻ al-ḥaqāʼiq wa-al-qawāʻid wa-jawāmiʻ al-raqāʼiq wa-al-fawāʼid1
- Khānī, Qāsim ibn Ṣalāḥ al-Dīn, 1618 or 1619-1697 or 1698. ʻIlm al-manṭiq1
- Kimonos1
- Kings and rulers--Duties1
- Kinship (Islamic law)1
- Knowledge, Theory of (Islam)1
- Korea1
- Kālī (Hindu deity)1
- Kārttikeya (Hindu deity)1
- Kāshī, Jamshīd ibn Masʻūd, -approximately 1436. Miftāḥ al-ḥussāb1
- Kūrānī, Ṭānā ibn Aḥmad, d. 1884? Naẓm Mukhtaṣar al-Manār1
- Ladino language1
- Ladino literature1