Author
- John of Ibelin1
- John of Lancaster, 1st Duke of Bedford1
- John, Duke of Berry1
- Joseph Yitzchak Hakohen Poppers1
- Joshua Benzion Segre1
- José Romero de Tejada y Artacho1
- João Gomes da Silva1
- Juan Alvarez1
- Juan Antonio de Hozes Sarmiento1
- Juan Baptista de Gatica1
- Juan Félix de Rújula1
- Juan Ortiz Campoy1
- Juan Perez Barahona1
- Juan Vicente de Güemes, 2nd Count of Revillagigedo1
- Juan de Foxá1
- Juan de Zumárraga1
- Karaçelebizade Abdülaziz1
- Khalīl ibn Shāhīn1
- Khālid ibn ʻAbd Allāh al-Azharī1
- Kingdom of Naples1