Abelio, Raymond
Aboim, Diogo Guerreiro Camacho de
Acton, Lord
Adams, Henry
Adams, John
Adams, John Quincy
Adler, Alfred
Adorno, Theodor Wiesengrund
Aflak , Michel
Agassiz, Jean Louis Rodolphe
Agostinho, Santo
Ahrens, Heinrich
Aires, Matias
Alain
Alberto Magno, Santo
Alembert
Alexander, Samuel
Alfieri, Vittorio Amadeo
Almond, Gabriel
Althusius
Althusser, Louis
Ameal, João
Ames, Fisher
Amin Samir
Ammirato, Scipione
António de Lisboa Santo
Aquino São Tomás de
Aranguren, Jose Luis
Araújo, João Salgado
Ardrey, Robert
Arendt, Hannah
Aristóteles
Aron Robert
Aron, Raymond
Arrais, D. Frei Amado
Arrow Kenneth Joseph
Aurélio, Marco
Austin, John
Averróis
Avicena
Azcárate Gumersindo de