| Abbreviation | Definition |
|---|---|
| AAF | Azerbaijan Automobile Federation |
| AAGR | All American Girl Racing |
| AAGR | All-American Girl Racing |
| AAR | All American Racers |
| AAR | All American Racing |
| AARA | Allied Auto Racing Association |
| AARA | Antique Auto Racing Association |
| AARN | Area Auto Racing News |
| ABJG | Anybody But Jeff Gordon |
| ABR | American Bicycle Racing |
| ABRC | Asheville Bicycle Racing Club |
| ACBR | Atlantic Coast Barrel Racing |
| ACPRC | Australian Conference of Principal Race Clubs |
| ACR | American Chopper Racing |
| ACR | American Classic Racing |
| ACR | American Club Racer |
| ACR | American Club Racing |
| ACR | Automotive Club Racer |
| ACR | Average Crappy Racecar |
| ACRC | Atlantic City Race Course |