| Abbreviation | Definition |
|---|---|
| AB | Air Bike |
| ABA | Alberta Bicycle Association |
| ABA | American Bicycle Association |
| ABAC | Arlington Bicycle Advisory Committee |
| ABATE | Alaska Bikers Advocating Training And Education |
| ABATE | American Bikers for Awareness, Training, and Education |
| ABCDE | Anabolic Burst Cycling of Diet and Exercise |
| ABCE | All British Cycling Event |
| ACA | Adventure Cycling Association |
| ACA | Austin Cycling Association |
| ACE | Academy of Cycling Excellence |
| ADCC | Australian Defence Cycling club |
| ADRA | Alberta Dirt Riders Association |
| AICL | Arizona Interscholastic Cycling League |
| AMB | Australian Mountain Bike |
| AMBG | Annadel Mountain Biking Group |
| APB | All Purpose Bicycle |
| APC | Association Professional Cycliste |
| APCA | Andhra Pradesh Cycling Association |
| ATB | All Terrain Bicycle |