- Manuscripts, English1
- Manuscripts, European4
- Manuscripts, Hebrew3
- Manuscripts, Italian2
- Manuscripts, Latin (Medieval and modern)1
- Manuscripts, Medieval4
- Manuscripts, Portuguese10
- Manuscripts, Renaissance6
- Manuscripts, Spanish2
- Maria Anna Josefa, Queen, consort of John V, King of Portugal, 1683-17541
- Meneses, Pedro de, Conde de Vila Real, -14371
- Missing leaves3
- Missions1
- Missions, Portuguese1
- Monasteries1
- Monasticism and religious orders1
- Mosteiro de S. Mónica (Lisbon, Portugal)1
- Musical notation5
- Nautical charts1
- Netherlands1