| AAB | American Association for Bronchology |
|---|---|
| AAB | American Association of Bioanalytics |
| AACO | American Association of Certified Orthoptists |
| 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.) |
| AAS | American Association of Suicidology |
| AAVA | American Association of Veterinary Anatomists |
| ABA | American Basketball Association |