Author
- Jordan von Quedlinburg1
- Joseph Nasi1
- Joseph ben Moses Sarfati1
- Joshua ben Israel Benveniste1
- Joshua ibn Shuaib1
- José Pellicer1
- Juan Gallo1
- Juan Páez de Castro1
- Juan de Foxá1
- Juan de Torquemada1
- Juana I of Castile1
- Judah Leib Prossnitz1
- Kamal al-Din ibn al-Humam1
- Kamalākara Bhaṭṭa1
- Kamāl al-Dīn ibn Āsāyish Shirwānī1
- Kanada1
- Kara Fazlî1
- Karakaşzade Ömer1
- Karaçelebizade Abdülaziz1
- Kaygusuz Abdal1