- Khabbāzī, ʻUmar ibn Muḥammad, 1231 or 2-1292. Mughnī fī uṣūl al-fiqh1
- Khalīl ibn Isḥāq al-Jundī, -1365? Mukhtaṣar. Bāb al-yamīn1
- Khamrīyah (Ibn al-Fāriḍ, ʻUmar ibn ʻAlī)1
- Khayālī, Aḥmad ibn Mūsá, -1457? Ḥāshiyah ʻalá sharḥ al-Taftāzānī1
- Khiḍr (Legendary character)1
- Khulāṣat al-ḥisāb (ʻĀmilī, Bahāʼ al-Dīn Muḥammad ibn Ḥusayn)1
- Khwājahʹzādah, Muṣṭafá ibn Yūsuf, -1487 or 14881
- Kifāyat al-ḥuffāẓ (Ibn al-Hāʼim, Aḥmad ibn Muḥammad)1
- Kings and rulers--Genealogy1
- Kings and rulers--Heraldry1
- Knights and knighthood1
- Kyi︠e︡vo-Pechersʹka lavra1
- Kyriales1
- Kyrie eleison (Music)1
- Kātī, Ḥusām al-Dīn al-Ḥasan, -1358 or 1359. Qāla aqūl1
- Lacquered bindings1
- Ladino language1
- Lamaʻāt (ʻIrāqī, Fakhr al-Dīn Ibrāhīm)1
- Land tenure (Germanic law)1
- Land use1