- Alfonso V, King of Aragon, 1396-14581
- Alfonso V, King of Asturias and León, 994-1027 or 10281
- Alfonso VI, King of Castile and Leon, 1030-11091
- Alfonso VII, The Emperor, King of Castile, 1104-11571
- Alfonso VIII, King of Castile, 1155-12141
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)1
- Allegory1
- Almanacs1
- Amadori, Bartolomeo1
- Amadori, Lorenzo1
- Amadori, Niccolo1
- Amulets1
- Ana, Queen, consort of Philip II, King of Spain, 1549-15801
- Anaya, Pedro1
- Animal culture1
- Annals and chronicles1
- Anthologies1
- Antiphons (Music)1
- Apologetic writings1
- Appendix Vergiliana1