- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Kashshāf (Zamakhsharī, Maḥmūd ibn ʻUmar)1
- Kemalpaşazade, 1468 or 1469-1534. Risālah fī al-haykal al-insānī1
- Khadījah, -approximately 6191
- Khamrīyah (Ibn al-Fāriḍ, ʻUmar ibn ʻAlī)1
- Khiḍr (Legendary character)1
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)1
- Ladino literature1
- Ladino poetry1
- Language and languages--Philosophy1
- Latin poetry1
- Laylat al-Qadr1
- Legacies (Islamic law)1
- Legal instruments (Jewish law)1
- Letter writing1
- Lettering pieces1
- Lumʻah al-Dimashqīyah (Shahīd al-Awwal, Muḥammad ibn Makkī)1
- Mahdi1
- Malchus, Saint1
- Manuscripts, American1