| Abbreviation | Definition |
|---|---|
| AIOC | The Atlanta International Olympic Committee |
| AIR | Across Indiana Run |
| AIR | Aerial Inversion Ride |
| AIS | active isolated stretching |
| AISC | Adelaide Indoor Sports Center |
| AISC | Adelaide Indoor Sports Centre |
| AISC | Atlanta Inland Sailing Club |
| AISC | Auckland Indian Sports Club |
| AISL | Adult Indoor Soccer league |
| AIT | Azzurra Italian Tourney |
| AITA | All India Tennis Association |
| AITS | Alliance of Independent Tae Kwon Do Schools |
| AIYAH | All 'Illini' Yell At Halftime! |
| AJ | Australian Junior |
| AJC | Australian Jockey Club |
| AJPHA | American Junior Paint Horse Association |
| AJR | Alex Job Racing |
| AJV | Austin Junior Volleyball |
| AJX | President's Choice AJaX Pan Am Ballpark |
| AKA | American Karate Association |