- Jābir ibn Sālim Shihāb al-Baghdādī1
- Jīlānī, Ibn Muḥammad Yūsuf, active 17th century1
- Kamal al-Din al-Ghazzi1
- Karmiyānī, Aḥmad ibn Muḥammad1
- Kastamūnī, ʻAbd al-Raḥmān1
- Khalid Balti1
- Khalkhālī, Masʻūd ibn Saʻd al-Dīn, active 16th century1
- Kharrāṭ, Ismāʻīl ibn Abī Bakr, active 17th century1
- Khān Muḥammad Maḥmūd ibn Ḥusayn ibn Muḥammad1
- Khūjah, Muḥammad Aḥmad1
- Kinānī, Ibrāhīm ibn Muṣṭafá, active 19th century1
- Kâtip Boşnāḳ Ibrāhīm ibn Aḥmet1
- Kāśīnātha1
- Kāśīnātha Devadhara (Son of Rāmabhaṭṭa Devadhara)1
- Kīrtidhara1
- Ladrāwī, ʻAbd al-Karīm ibn Muḥammad, active 14th century?1
- Lena suor1
- Leonhard Bernecker1
- Lorenzo da Pisa1
- Luxeuil Abbey1