| Abbreviation | Definition |
|---|---|
| ADRL | American Drag Racing League |
| ADRL | Arabian Drag Racing League |
| AER | American Endurance Racing |
| AERO | Alternative Energy Racing Organization |
| AGCO | Alcohol and Gaming Commission of Ontario |
| AGF | Amazing Grace Fellowship |
| AGRC | Amazing Grace Resource Center |
| AGRC | Anti Gravity Racing Championship |
| AITG | An Invitation to Grace |
| AJR | Alex Job Racing |
| ALMS | American LeMans Series |
| AMGA | Alpinestars Motorcycle Gear & Apparel |
| AMRA | American Motor Racing Association |
| AMRA | American Motorcycle Racing Association |
| AMRA | American Mud Racing Association |
| AMRA | Automotive Manufacturers Racing Association |
| AMRC | Asian Marble Racing Confederation |
| ANRA | American Nostalgia Racing Association |
| AOR | Apex Online Racing |
| AORC | Association of Official Racing Chemists |