- John Manuel, Prince of Portugal, 1537-15541
- John V, King of Portugal, 1689-17501
- Juana, of Austria, Princess of Portugal, 1535-15731
- Kingdom of God1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Latin (Latin Europe)1
- Law1
- Letters, Papal1
- Luxembourg1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts, Dutch1
- Manuscripts, Portuguese1
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Meditations1
- Missals1
- Missing leaves1
- Missions1
- Monastic and religious life of women1
- Morocco bindings1
- Mosteiro de S. Mónica (Lisbon, Portugal)1