- Jārūdī, Nāṣir ibn Muḥammad, active 18th century1
- Jīlī, ʻAbd al-Karīm ibn Ibrāhīm, 1365 or 1366- Risālat al-Tawḥīd1
- Kalanbawī, Ismāʻīl ibn Muṣṭafá, -1790 or 1791. Burhān fī ʻilm al-mīzān1
- Kalbī, Diḥyah ibn Khalīfah, -approximately 6701
- Kamāl al-Dīn Muḥammad ibn Muḥammad, -1418. Naẓm Nukhbat al-fikar fī muṣṭalaḥ ahl al-athar1
- Kamāl al-Dīn al-Bakrī, Muḥammad ibn Muṣṭafá, 1730 or 1731-1781 or 1782. Fatḥ al-ilāh fī madḥ Rasūl Allāh1
- Kapitalbünde1
- Karaites (Jewish law)1
- Karmī, Marʻī ibn Yūsuf, -1623 or 16241
- Karshuni1
- Kashmir Śaivism1
- Kaydānī. Maṭālib al-muṣallī1
- Kaʻbah (Mecca, Saudi Arabia)1
- Kemalpaşazade, 1468 or 1469-15341
- Kemalpaşazade, 1468 or 1469-1534. Risālah fī al-haykal al-insānī1
- Kemalpaşazade, 1468 or 9-1534. Risālah fī al-haykal al-insānī1
- Keśavācārya Daivajña, active 16th century. Jātakapaddhati1
- Khadījah, -approximately 6191
- Khafrī, Muḥammad, -1407 or 1408. Ḥāshīyah ʻalá Sharḥ al-Qūshjī ʻalá al-Tajrīd1
- Khalifa ben Shemuʹel, 17th century1