Author
- Johannes Nider2
- John Mandeville2
- John Montgomery2
- John of Wales2
- Josef ibn Tabul2
- Joseph ben Gorion2
- Juana I of Castile2
- Judah Leib Pukhovitser2
- Judah Rosanes2
- Jérôme Lalande2
- Kauṇḍa Bhaṭṭa2
- Khalīl ibn Isḥāq al-Jundī2
- Khalīl ibn Rasūl Sīnūbī2
- Khaṭīb, ʻAlāʼ al-Dīn ibn ʻAbd al-Bāqī, fl. 15952
- Khwaja Abdullah Ansari2
- Koca Ragıp Pasha2
- Kāśīnātha Bhaṭṭācārya2
- Lactantius2
- Latîfî2
- Leo X2