| Abbreviation | Definition |
|---|---|
| AMRAP | As Many Rounds As Possible |
| AMRD | Atlanta Men's Roller Derby |
| AMRD | Automated Map Reading Detection |
| AMS | Athletic Management System |
| AMSAC | Australian Motor Sport Appeal Court |
| AMSL | Aurora Minor Soccer League |
| AMT | American Match Target |
| AMTA | Anderson Mill Tennis Association |
| AMU | Anti Manchester United |
| AMZ | Athletic Munduan Zehar |
| ANCC | Army Navy Country Club |
| ANG | ANGus Glen Golf Club |
| ANSA | Australian National Saddlehorse Association |
| ANSA | Australian National Sportfishing Association |
| ANSL | American National Sports League |
| AO | Amateur Owner |
| AOA | Age Of Apocalypse |
| AOA | Alberta Orienteering Association |
| AOC | Adidas Outdoor Championships |
| AOD | Arena Of Death |