- Kirmānī, Maḥmūd ibn Muḥammad, 1329?-1404 or 1405. Farāʼiḍ al-ījāz1
- Kisāʼī, ʻAlī ibn Ḥamzah, -804 or 8051
- Kitāb (Sībawayh, ʻAmr ibn ʻUthmān)1
- Kumayl ibn Ziyād, 633 or 634-7011
- Kāfī al-mubtadiʼ min al-ṭullāb (Ibn Balabān, Muḥammad ibn Badr al-Dīn)1
- Kāfī fī al-ʻarūḍ wa-al-qawāfī (Tibrīzī, Yaḥyá ibn ʻAlī)1
- Land tenure1
- Languages, Secret1
- Latin language1
- Laughter--Religious aspects--Islam1
- Laylat al-Barāʼah1
- Laylat al-Qadr1
- Learning1
- Lebanon--Tripoli1
- Legacies (Islamic law)1
- Legal instruments1
- Letter writing, Arabic1
- Letter writing, Persian1
- Letter writing, Turkish1
- Libel and slander--Religious aspects--Islam1