- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Kyi︠e︡vo-Pechersʹka lavra1
- Kölner Dom1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin poetry, Medieval and modern1
- Letters, Papal1
- Lollards1
- Ludwig IV, Holy Roman Emperor, 1282?-13471
- Magnificat (Music)1
- Manicules1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts1
- Manuscripts, Arabic1
- Manuscripts, European1
- Manuscripts, Italian1
- Manuscripts, Portuguese1
- Manuscripts, Spanish1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541