| Abbreviation | Definition |
|---|---|
| AGU | Australian Golf Union |
| AH | Ace of Hearts |
| AHAI | Amateur Hockey Association of Illinois |
| AHHA | American Heritage Horse Association |
| AHHA | American Holsteiner Horse Association |
| AHL | Ahl Hockey League |
| AHL | American Hockey League |
| AHL | Asian Hockey League |
| AHS | American HIking Society |
| AHW | The Amature Hardcore Wrestling |
| AI | Athletic Instructor |
| AIA | Athletes In Action |
| AIB | Aberdeen IronBirds |
| AIDA | Association Internationale pour le D??veloppement de l'Apn??e (free-diving) |
| AIFF | All India Football Federation |
| AIHF | Australian Ice Hockey Federation |
| AIK | Allm??nna Idrotts Klubben |
| AILTA | All India Lawn Tennis Association |
| AIM | Anglers Inshore Members |
| AIO | Aikido Instructors Organization |