| AAAL | american academy of arts and letters |
|---|---|
| AAB | American Association for Bronchology |
| AAB | American Association of Bioanalytics |
| AACO | American Association of Certified Orthoptists |
| AACO | Armenian American Christian Outreach |
| AACO | Asian Americans for Community Outreach |
| AAE | American Association of Engineers (skr.) |
| AAF | American Advertising Federation |
| AAI | Alliance of American Insurers |
| AAI | American Alpine Institute (skr.) |