- Iʻrāb ʻan qawāʻid al-iʻrāb (Ibn Hishām, ʻAbd Allāh ibn Yūsuf)1
- Jamālī, Fuḍayl ibn ʻAlī, 1514-1583. ʻAwn al-rāʼiḍ fī fann al-farāʼiḍ1
- Japan1
- Jesuits1
- Jewish courts1
- Jewish diaspora1
- Jewish ethics1
- Jewish travelers1
- Jews--Dietary laws1
- Jews--Persecutions1
- Jiménez de Cisneros, Francisco, 1436?-15171
- Joachim, Saint1
- John I, King of Portugal, 1357-14331
- John II, King of Aragon, 1397-14791
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- John VIII Palaeologus, Emperor of the East, 1392-14481
- Judaism--Ari rite1
- Judaism--Customs and practices1