Encyclopedias, Almanacs, Transcripts, and Maps
- Atatürk, Mustafa Kemal (1881–1938)
- Aten
- Atget, Eugène
- Atkins, Vera
- Atlanta Compromise
- Atlanta Riot of 1906
- Atlantic Colonial Commerce
- Atlantic Crossing
- Atlantic Fisheries
- Atlantic Slave Trade
- Atomic Energy Acts
- Attlee, Clement (1883–1967)
- Attlee, Clement R.
- Attucks, Crispus
- Auchinleck manuscript
- Auclert, Hubertine
- Auden, W. H. (1907–1973)
- Audley End
- Augier, Roy
- Augsburg, Religious Peace of (1555)