| AAB | American Association for Bronchology |
|---|---|
| AAB | American Association of Bioanalytics |
| AAB | Anglo American Book |
| AAD | American Academy of Denturity |
| AAD | American Academy of Dermatology |
| AAE | American Association of Engineers (skr.) |
| AAF | American Advertising Federation |
| AAI | Alliance of American Insurers |
| AAI | American Alpine Institute (skr.) |
| AAI | American Alpine Institution |