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