- Kekchi language1
- Khalīl ibn Isḥāq al-Jundī, -1365? Mukhtaṣar. Bāb al-yamīn1
- Khayālī, Aḥmad ibn Mūsá, -1457? Ḥāshiyah ʻalá sharḥ al-Taftāzānī1
- Khiḍr (Legendary character)1
- Khānaqāh-i Niʻmat Allāhī1
- Kifāyat al-ḥuffāẓ (Ibn al-Hāʼim, Aḥmad ibn Muḥammad)1
- Kirchmair, Georg, 1481-15541
- Knights and knighthood1
- Knowledge, Theory of1
- Kārtavīryārjuna (Hindu deity)1
- Ladino language1
- Land titles--Registration and transfer1
- Land value taxation1
- Language and languages--Philosophy1
- Languages, Secret1
- Latin drama (Comedy)1
- Latin drama (Tragedy)1
- Latin language--Grammar1
- Latin letters, Medieval and modern1
- Lazari, Marlinus Micarias1