- Jesuit drama, Spanish1
- Jewish sermons, Hebrew1
- 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
- Justa, Saint, -approximately 2871
- Karo-Batak dialect1
- Knotesford, John, -15891
- Kāsānī, Aḥmad Khvājagī1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Lang, Matthäus, 1468-15401
- Language and languages1
- Lapidaries (Medieval literature)1
- Latin language--Grammar1
- Laudatory poetry, Latin1
- Laude1
- Law1
- Legal documents1
- Legal petitions1