- Kanz al-wuṣūl ilá maʻrifat al-uṣūl (Bazdawī, ʻAlī ibn Muḥammad)1
- Karaite manuscripts1
- Karaitic literature1
- Kaʻbah (Mecca, Saudi Arabia)1
- Kemalpaşazade, 1468 or 1469-15341
- Ketubah1
- Khamrīyah (Ibn al-Fāriḍ, ʻUmar ibn ʻAlī)1
- Khaṭīb al-Baghdādī, Abū Bakr Aḥmad ibn ʻAlī, 1002-1071. Asmāʼ al-mubhamah fī al-anbāʼ al-muḥkamah1
- Kings and rulers--Duties1
- Kings and rulers--Heraldry1
- Kirchmair, Georg, 1481-15541
- Kirmānī, Maḥmūd ibn Muḥammad, 1329?-1404 or 1405. Farāʼiḍ al-ījāz1
- Lacquered bindings1
- Ladron de Guevara family1
- Lamberto, Jacopo di1
- Lamucci, Corso1
- Lanaiolo, Gherardo1
- Land value taxation1
- Laterino, Cristoforo1
- Laterino, Pietro1