Author
- John of Seville1
- Joseph Haslewood1
- Joseph ben Moses Sarfati1
- Josephus1
- Juan de Torquemada1
- Juana I of Castile1
- Julianus Pomerius1
- Kalonymus ben Kalonymus1
- Kamal al-Din ibn al-Humam1
- Khaṭīb Qādā, ʻAbd Allāh ibn Muḥammad, active 15th century1
- Khvājah Muḥammad Pārsā1
- Konrad III. von Soltau1
- Laurentius Cynthius1
- Leo I1
- Leon Battista Alberti1
- Leontius of Costantinople1
- Lope de Espejo1
- Lorenzo Guglielmo Traversagni1
- Lorenzo Valla1
- Lorenzo de' Medici1