- Agrimony
- Agrionia
- Agrippa
- Agrippa, Herod, I.
- Agrippa, Herod, II.
- Agrippa, Marcus Vipsanius
- Agrippa Von Nettesheim, Henry Cornelius
- Agrippina (elder)
- Agrippina (younger)
- Agroteras Thusia
- Aguadilla
- Aguado, Alexandre Marie
- Aguascalientes
- Ague
- Aguesseau, Henri François d'
- Aguilar, Grace
- Aguilar
- Águilas
- Aguilera, Ventura Ruiz
- Aguillon, François D'
- Ahab
- 'Ahai
- Ahasuerus
- Ahaz
- Ahaziah
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- Aidan (bishop)
- Aide-de-Camp
- Aidin
- Aidone
- Aids
- Aigrette
- Aigues-Mortes
- Aiguille
- Aiguillette
- Aiguillon, Emmanuel Armand de Wignerod ... , Duc d'
- Aiguillon, Marie Madeleine de Wignerod ... , Duchesse d'
- Aigun
- Aiken
- Aikin, Arthur
- Aikin, John
- Aikman, William
- Ailanthus
- Ailly, Pierre D'
- Ailsa Craig
- Aimak
- Aimard, Gustave
- Aimoin
- Ain
- Ainger, Alfred
- Ainmuller, Maximilian Emmanuel
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- Ainsworth, Henry
- Ainsworth, Robert
- Ainsworth, William Harrison
- Aintab
- Ainu
- Air (country)
- Air
- Airay, Henry
- Aird, Thomas
- Airdrie
- Aire (Landes)
- Aire (Pas-De-Calais)
- Air-Engine
- Airey, Richard Airey
- Air-Gun
- Airy, Sir George Biddell
- Aislabie, John
- Aisle
- Aisne
- Aïssé, Mademoiselle
- Aiton, William
- Aitzema, Lieuwe Van
- Aivali
- Aiwan
- Aix
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