Author
- Ildibrandinus1
- Imam Birgivi1
- Immanuel Tremellius1
- Innocent IV1
- Izz al-Din ibn 'Abd al-Salam1
- Jacobo Bellenden1
- Jacopo Nannis de Piccolomini1
- Jacques Lempereur1
- Jahangir Mirza Qajar1
- Jakob Christoph Blarer von Wartensee1
- Jalal Al-Din Al-Khabazi1
- Jalaluddin al-Mahalli1
- James V of Scotland1
- Jami1
- Jerónimo de Vivar1
- Jews1
- Jiang Zhi1
- Jiménez de Enciso, Andrés1
- Joanna I of Naples1
- Joanna of Austria, Princess of Portugal1