Thomas Kingsmill Abbott
H.B. Acton
John Emerich Edward Dalberg, Lord Acton
Abigail Adams
Charles Francis Adams
Henry Adams
John Adams
John Quincy Adams
Samuel Adams
Joseph Addison
Jonathan H. Adler
Mortimer J. Adler
Aeschylus
Thomas Ahnert
K Narayanaswami Aiyar
Mustafa Akyol
Armen A. Alchian
John Alcorn
Lucie Alden
Jean Le Rond d’ Alembert
Alexander the Great
Rev. B.H. Alford
Maulvi Muhammed Ali
Syed Nawab Ali
William Richard Allen
William Allen
William Barclay Allen
William Talbot Allison
Johannes Althusius
John Alvis
Elizabeth Amato
Ambrose
Fisher Ames
Joshua D. Ammons
Amos
Rasmus B. Anderson
Charles M. Andrews
An American (Anonymous)
Saint Anselm
Marcus Aurelius Antoninus
Joyce Oldham Appleby
St. Thomas Aquinas
Arthur John Arberry
Archimedes
Aristophanes
Aristotle
David Armitage
Thomas Henry Arnold (the younger)
Nigel Ashford
Sir William James Ashley
Robert Ashton
Saint Francis of Assisi
Edward Atkinson
Saint Augustine
Edward Aveling
Averroes (Ibn Rushd)
Avicenna
Manuel Ayau