Author
- Jerónimo Román y Zamora1
- Joachim Bendel1
- Joanna I of Naples1
- Joannes Dominicus de Marchis1
- Joannes Thomas Beltamino1
- Joham de Vernoils1
- Johann Hertzhaimer1
- Johann Neudörffer the Elder1
- Johannes Cnipius1
- Johannes Lemp1
- Johannes Lichtenberger1
- Johannes Mellarinus1
- Johannes Schöner1
- Johannes Tostius1
- Johannes de Sacrobosco1
- John Cornelius1
- John Crosse1
- John Eyr1
- John Felton1
- John Frederick II of Saxony1