| AAAL | american academy of arts and letters |
|---|---|
| AAB | Advertising Association of Baltimore |
| AAB | American Association of Bioanalytics |
| AAB | Annals of Applied Biology |
| AAB | Association of Aircraft Brokers, Združenie sprostredkovateľov v leteckej doprave (angl.skr.) |
| AAB | Association of Applied Biologists |
| AACO | AIDS Activities Coordinating Office |
| AACO | Amaryllis Avakian Clinica Oftalmologica |
| AACO | American Association of Certified Orthoptists |
| AACO | Arizona Association of Counties (skr.) |