| Abbreviation | Definition |
|---|---|
| AA | All American |
| AA | All Around |
| AA | Ancient Anguish |
| AA | Average Attendance |
| AAA | Anglers of All Abilities |
| AAA | Australian Anglers Association |
| AAA | Average Amateur Attempt |
| AAAA | Athleticism Attitude Academics And Adversity |
| AAABA | American Amateur Athletic Baseball Association |
| AAAD | Alamo Area Aquatics Diving |
| AAB | Adjusted At Bats |
| AAB | All Amateur Basketball |
| AABA | All American Baseball Alliance |
| AABC | American Amateur Baseball Congress |
| AABF | Athletic Association of Black Forest |
| AAC | Another Asteroids Clone |
| AAC | Athletes Advisory Council |
| AAFI | Amateur Athletic Federation of India |
| AAGA | Asian American Golf Association |
| AAGP | Approved Adoption Group Program |