- Anscombe, G. E. M.
- Albertus Magnus@
- al-Kindi, Yaqub ibn Ishaq
- Alexander, Samuel
- Anselm of Canterbury, St.@
- Albert of Saxony
- Althusser, Louis@
- Ajdukiewicz, Kazimierz
- Adelard of Bath
- Abelard, Peter
- Anaxarchus
- Aquinas, St. Thomas@
- Apel, Karl-Otto
- Alexander of Hales@
- Alexander of Aphrodisias
- Abramowski, Edward
- Austin, John Langshaw
- Aristippus of Cyrene
- Ammonius Saccas
- Alston, William P.
- Agamben, Giorgio
- Arcesilaus
- Anaximenes
- Astell, Mary
- Ambrose of Milan, St.@
- Anaximander
- Alexander Polyhistor@
- Aenesidemus
- Arnauld, Antoine
- Adorno, Theodor W.
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- Adorno, Theodor W.
- Adler, Mortimer J.
- Antiphon
- Auriol, Peter
- Austin, John
- Alcott, Amos Bronson
- Archytas of Tarentum
- Andronicus of Rhodes
- Anaxagoras
- Aune, Bruce
- al-Ghazali, Abu Hamid
- Antisthenes
- Augustine of Hippo, St.@
- Avicenna
- Abrabanel, Judah
- Arendt, Hannah
- Alembert, Jean le Rond d'
- Alcmaeon of Croton
- Agrippa, Heinrich Cornelius@
- Aristotle
- al-Farabi, Abu Nasr
- Averroes
- Armstrong, David M.
- al-Razi, Abu Bakr
- Apuleius of Madaura@
- Ayer, Alfred Jules
- Archelaus
- Abravanel, Isaac
- Alighieri, Dante@
- Adamson, Robert
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