| Abbreviation | Definition |
|---|---|
| AAHA | Appleton Area Hockey Association |
| AAIP | Anglers Advantage Insurance Program |
| AAIS | All American Indoor Sports |
| AAMYC | Ann Arbor Model Yacht Club |
| AAR | Able And Ready |
| AAR | After Action Rub |
| AAR | All American Racers |
| AAR | All American Racing |
| AARA | American Amateur Racquetball Association |
| AARC | American Association of Running Clubs |
| AARC | Ann Arbor Rowing Club |
| AAS | All America Selection |
| AAS | All America Selections |
| AASA | Alberta Amateur Softball Association |
| AASDA | Aikijujitsu Aikido Self Defense Academy |
| AASI | American Association of Snowboard Instructors |
| AAUA | Anne Arundel Umpire Association |
| AAUC | Amateur Athletic Union of Canada |
| AAWCS | All American Wrestling Camp System |
| AAYA | Anishinabe Athletic Youth Association |