- Alfonso I King of Asturias, 693-7561
- Alfonso III, King of Asturias and Leon, approximately 848-approximately 9101
- 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
- Alfonso X, King of Castile and Leon, 1221-12843
- Alfīyah (Ibn Mālik, Muḥammad ibn ʻAbd Allāh)43
- Alfīyah fī muṣṭalaḥ al-Ḥadīth (Suyūṭī)1
- Alfīyat al-ʻIrāqī (ʻIrāqī, ʻAbd al-Raḥīm ibn al-Ḥusayn)11
- Algebra11
- Algeria1
- Alids3
- Alimony (Islamic law)1
- Aljamía1
- Allegories6
- Almagest (Ptolemy)2
- Almanach perpetuum celestium motuum (Zacuto, Abraham ben Samuel)1
- Almanacs3