- Italy--Treviso1
- Italy--Vicenza1
- Jamʻ al-jawāmiʻ fī al-uṣūl (Subkī, Tāj al-Dīn ʻAbd al-Wahhāb ibn ʻAlī)1
- Japanese poetry1
- Jewish illumination of books and manuscripts1
- Jewish law1
- Jewish sermons, Hebrew1
- Jews--Dietary laws1
- Jews--Education1
- Jews--Politics and government1
- John I, King of Portugal, 1357-14331
- John, King of England, 1167-12161
- Jugurthine War (111-105 B.C.)1
- Justa, Saint, -approximately 2871
- Justinian I, Emperor of the East, 483?-5651
- Kekchi language1
- Kings and rulers--Genealogy1
- Kufr (Islam)1
- Kāfiyah (Ibn al-Ḥājib, ʻUthmān ibn ʻUmar)1
- Ladino poetry1