- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Lamucci, Corso1
- Law1
- Logic1
- Lorraine, Nicolas-François, duc de, 1609-16701
- Manuel I, King of Portugal, 1469-15211
- Manuele, Luigi1
- Manuscripts1
- Manuscripts, 16th century1
- Manuscripts, Arabic1
- Manuscripts, Oriental1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Merchants1
- Meschiati, Giovanni1
- Michele, Lorenzo de'1
- Missions1