AAB
- ABN AMRO
- AaB A/S
- Aab (surname)
- Aalborg Boldspilklub
- Abelag Aviation
- Aboriginal Arts Board
- Acetic acid bacteria
- Act Against Bullying
- Adyar Ananda Bhavan
- Air Assault Badge
- Akbar Al Baker
- Akita Asahi Broadcasting
- Alice Bailey
- Alumu language
- Android App Bundle
- Aniline Yellow
- Antigua and Barbuda
- Arrabury Airport
- Arubaanse Atletiek Bond
- Association of Applied Biologists
- Athletics Association of Barbados
- Bar form