Abaelardus, Petrus (1079-1142)
Abubacer/Abentofail/Ibn Tufayl, Abu Bakr Muhammad ibn cAbd al-Malik ibn Muhammad (1561-1626)
Aeschylus (520-456 B.C.)
Agricola, Rodolphus (Phrisius)/Huysman, Roelof (1443/44-1485)
Agrippa, Cornelius/Nettesheim, Heinrich Cornelis von (1486-1535)
Alberti, Leon Battista (1404-1472)
Albertus Magnus, S. (1206/7-1280)
Albinus Philosophus/Smyrnaeus/Platonicus/Alcinous (2nd cent.)
Alcuin/us, Albinus Flaccus/Alcuinus de York/Ealhvine (ca. 735-804)
Alhazen/Alhacen, Ibn al-Haitham, Abu-Ali al-Hasan ibn al-Hasan (965-1039/40)
Alembert, Jean-Baptiste Le Rond d' (1717-1783)
Alanus ab (de) Insulis/Alain de l'Isle/Alain de Lille (ca. 1128-1203)
Alexander Aphrodisiensis (2nd-3rd cent.)
Alighieri, Dante (1265-1321)
Alphanus Salernitanus (1015/20-1085)
Alpharabius/Abunaser/Al-Farabi, Muhammad ibn Muhammad ibn Tarhan/Abu-Nasr (870-950)
Althusser, Louis (1918-1990)
Ambrosius Mediolanensis, S. (340-397)
Anaxagoras (496-428 B.C.)
Anaximander (616-547 B.C.)
Anaximenes (585/84-528/524 B.C.)
Angela de Fulginia/Angela da Foligno (1248-1309)
Anselmus Cantuariensis/Anselmo d'Aosta, S. (1033/34-1109)
Apollonios/us Rhodios (ca. 290-ca. 230)
Apuleius, Lucius (ca. 125-ca. 170/180)
Aratus Solensis/de Soles (ca. 310-245 B.C.)
Aristophanes (ca. 445-ca. 385)
Aristoteles (384-322 B.C.)
Arnobius Siccensis/de Sicca (255-327)
Auger, Louis-Simon (1772-1829)
Augustinus Hipponensis, Aurelius, S. (354-430)
Averroës/Ibn Rusd, Abu 'l-Walid Muhammad ibn Ahmad ibn Muhammad (1126-1198)
Avicenna/Ibn Sina, Abu cAli al-Husayn ibn cAbdallah (980-1037)