Author
- Juan Ortiz Campoy1
- Juan Páez de Castro1
- Juan de Mena1
- Juan de Torquemada1
- Juan de Zumárraga1
- Judah Leib Ben Zeev1
- Judah Rosanes1
- Julius III1
- Jullien Gervais1
- Junayd ibn Sandal Baghdādī1
- Jñānamṛtapata1
- Jörg Muelich1
- Kabbāshī, Aḥmad1
- Kalyanamalla1
- Kamal Khujandi1
- Kamāl al-Dīn Turkumānī1
- Kamāl al-Dīn ibn Āsāyish Shirwānī1
- Kanada1
- Kanō Gensen1
- Karakaşzade Ömer1