- Jewish diaspora1
- John IV, King of Portugal, 1604-16561
- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Judgment Day (Islam)1
- Jumʻah1
- Kansas--Lawrence1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin America2
- Law1
- Logic1
- Maghribī, Aḥmad ibn ʻAbd al-Razzāq, -1684 or 1685. Manẓūmat al-shuhadāʼ1
- Malikites1
- Manicules1
- Manners and customs3
- Manuel I, King of Portugal, 1469-15211
- Manuscript maps1
- Manuscripts1
- Manuscripts, Arabic5