Encyclopedias, Almanacs, Transcripts, and Maps
- Aquinas, Thomas c. 1225–1274
- Arab World Immigration
- Arabian Nights
- Arabs and Arab Americans
- Arbitration, Mediation, and Conciliation
- Archaeogenetics
- Argentinean Americans
- Aristotle 384–322 BCE
- Armed Neutralities
- Armenian Americans
- Arms Transfers and Trade
- Art and Society
- Art, Drama/Performance
- Artemis Diana
- Artificial Social Life
- Artists, Women
- Asexuality
- Asian Indian, Korean, and Southeast Asian Immigration
- Asian-American Feminism
- Asian-American Studies