Human beings, each considered as a single actor within society
- Activists - Individuals who take direct action to achieve a social or political end
- Acton, Lord John - British historian, known as Lord Acton
- Actors and Actresses - Performers on film, television or plays
- Adams, Charles - Attorney, tax historian and author
- Adams, John - Second President of the United States
- Adams, Samuel - American revolutionary leader, organizer of the Boston Tea Party
- Alberdi, Juan Bautista - Argentine jurist, considered the "Father" of the Argentine Constitution
- Allen, Woody - American director, actor and screenwriter, won Best Director Oscar for Annie Hall
- Almodovar, Norma Jean - Los Angeles traffic officer turned call girl, and subsequently activist and author
- Andersen, Hans Christian - Nineteenth-century Danish writer, author of dozens of fairy tales
- Anderson, Poul - American science fiction author, winner of several Prometheus Awards
- Aristotle - Greek philosopher, tutor of young Alexander the Great
- Armentano, Dominick T. - Economics professor (emeritus) at the University of Hartford
- Athletes - Professional or amateur sportsmen and sportswomen
- Authors - Fiction and non-fiction writers of books, stories and other literature
- Authors, Science Fiction - Writers of fictional accounts with scientific or pseudo-scientific bases
- Ayau, Manuel F. - Founder of the Universidad Francisco Marroquín, Guatemala
- Ayittey, George B. N. - Professor of economics at American University, president of the Free Africa Foundation
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