| AAA | amateur athletic association (skr.) |
|---|---|
| AAB | Advertising Association of Baltimore |
| AAB | American Association for Bronchology |
| AAB | American Association of Bioanalytics |
| AACO | American Association of Certified Orthoptists |
| AACO | Association Astronomique de Côte d'Or |
| AAE | American Association of Engineers (skr.) |
| AAM | American Association of Museums |
| AAPA | American Association of Port Authorities, Americké združenie prístavných úradov (angl.skr.) |
| AAR | Association of American Railroads, Asociácia amerických železničných spoločností (angl.skr.) |