- Kings and rulers1
- Lafões, Pedro Henrique de Bragança, Duque de, 1718-17611
- Law1
- Liturgics8
- Lyric poetry1
- Manuel I, King of Portugal, 1469-15211
- Manuscripts3
- Manuscripts, English1
- Manuscripts, Italian2
- Manuscripts, Latin (Medieval and modern)1
- Manuscripts, Portuguese5
- Manuscripts, Renaissance5
- Manuscripts, Spanish2
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Missing leaves3
- Missions1
- Missions, Portuguese1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Musical notation5
- Netherlands1