Human beings, each considered as a single actor within society
Featured Individuals
- Aristotle (Ἀριστοτέλης; 384-322 BCE) - Ancient Greek philosopher, author of the Nicomachean Ethics
Notable Individuals
- Activists - Individuals who take direct action to achieve a social or political end
- Adams, John (1735-1826) - Second president of the United States
- Armentano, Dominick T. (1940- ) - Economics professor (emeritus) at the University of Hartford
- 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 (1925-2010) - Founder of the Universidad Francisco Marroquín, Guatemala
Other Individuals
- Acheson, Dean (1893-1971) - American political official, United States Secretary of State (1949-1953
- Acosta, José de (1539-1600) - Jesuit missionary in Peru and Mexico, author of Historia natural y moral de las Indias (1590)
- Adams, Charles (1930-2013) - Attorney and tax historian, author of For Good and Evil: The Impact of Taxes on the Course of Civilization (1993))
- Adams, Joseph P. (1907-2003) - United States Marine Corps brigadier general, member of the Civil Aeronautics Board
- Adams, Samuel (1722-1803) - American revolutionary leader, organizer of the Boston Tea Party
- Adams, Sherman (1899-1986) - Politician, governor of New Hampshire (1949-1953), White House Chief of Staff (1953-1958)
- Agrippina, Julia (IVLIA AGRIPPINA; 15-59) - Granddaugher of Roman emperor Augustus, sister of Caligula, fourth wife of Claudius and mother of Nero
- Ainsworth, Henry (1571-1622) - English Nonconformist clergyman and Hebrew scholar
- Alberdi, Juan Bautista (1810-1884) - Argentine jurist, considered the "Father" of the Argentine Constitution
- Aleandro, Norma (1936- ) - Argentine actress, winner of Cannes Award for best actress in La Historia Oficial
- Alexander the Great (Ἀλέξανδρος; 356-323 BCE) - King of Macedonia, who built an empire from Greece to the Indus river and south into Egypt
- Alger, Bruce (1918-2015) - Politician, member of the United States House of Representatives from Texas (1955-1965)
- Allen, Charles (1797-1869) - Politician, member of the United States House of Representatives from Massachusetts (1849-1853)
- Allen, Woody (1935- ) - American director, actor and screenwriter, won Best Director Oscar for Annie Hall
- Almodovar, Norma Jean (1951- ) - Los Angeles traffic officer turned call girl, and subsequently activist and author
- Amery, L. S. (1873-1955) - British Conservative politician
- Amiel, Barbara (1940- ) - British/Canadian journalist and author
- Andersen, Hans Christian (1805-1875) - Nineteenth-century Danish writer, author of dozens of fairy tales
- Anderson, Benjamin M. (1886-1949) - 19th/20th century American economist of the Austrian School
- Anderson, Clinton (1895-1975) - Politician, United States senator from New Mexico (1949-1973)
- Anderson, C. W. - Businessman, trustee of The Institute for Humane Studies
- Anderson, Gary M. (1955-2015) - Professor of economics at California State Universiy, Northridge
- Anderson, Poul (1926-2001) - American science fiction author, winner of several Prometheus Awards
- Anderson, William L. - Professor of economics at Frostburg State University
- Andrews, T. Coleman (1899-1983) - American accountant and politician, Comissioner of Internal Revenue (1953-1955), 1956 presidential candidate of the States' Rights Party
- Angell, Norman (1872-1967) - English Member of Parliament, awarded 1933 Nobel Peace Prize
- Aquinas, Thomas (Tommaso d'Aquino; 1225-1274) - Italian theologian and philosopher, author of Summa Theologiae
- Arends, Leslie C. (1895-1985) - Politician, member of the United States House of Representatives from Illinois (1935-1974)
- Aristogeiton (Ἀριστογείτων; -514 BCE) - Older lover of Harmodius; the two Athenians assassinated Hipparchus (brother of the tyrant Hippias) and became celebrated as the Tyrannicides
- Armentano, Paul (1972- ) - American activist, deputy director of the National Organization for the Reform of Marijuana Laws
- Armstrong, Billie Joe (1972- ) - Singer and guitarist with punk band Green Day
- Artaxerxes II (Ἀρταξέρξης; -358 BCE) - King of the Achaemenid Empire (404-358 BCE)
- Ashcroft, John (1942- ) - Governor of Missouri, U. S. Senator and U.S. Attorney General
- Ashford, Nigel (1952- ) - British political scientist, officer of the Institute for Humane Studies
- Asimov, Isaac (1920-1992) - American science fiction writer, postulated the Three Laws of Robotics
- Attenborough, Richard (1923-2014) - British actor, director and producer
- Auld Jr., Hugh (1799-1861) - Master of Frederick Douglass, forbade his wife Sophia to teach reading to Douglass
- Auld, Sophia (1797-1880) - Hugh Auld's wife, taught alphabet and reading to Frederick Douglass
- Ayittey, George (1945-2022) - Professor of economics at American University, president of the Free Africa Foundation
- Ayres, Lew (1908-1996) - American actor, known for starring role in in All Quiet on the Western Front