- Jābir ibn Ḥayyān1
- Jāmiʻ al-Azhar1
- Jārabardī, Aḥmad ibn al-ḥusayn, d. 1346. Sharḥ al-Shāfiyah1
- Kalāʼī, Muḥammad ibn Sharaf, d. 13751
- Karaites1
- Karaites--Liturgy1
- Karaitic literature1
- Kavvanot (Cabala)1
- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 2-1292. Mughnī fī uṣūl al-fiqh1
- Khawāfī, Muḥammad ibn Muḥammad, 1356-1435. Awrād al-Zaynīyah1
- Kifāyat al-ḥuffāẓ (Ibn al-Hāʼim, Aḥmad ibn Muḥammad)1
- Kings and rulers--Genealogy1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Land grants1
- Land value taxation1
- Languages, Secret1
- Latin drama (Tragedy)1
- Latin literature--Study and teaching1
- Latin poetry, Medieval and modern1