| Abbreviation | Definition |
|---|---|
| CCGF | Calvary Chapel Grace Fellowship |
| CCR | Cone Count Racing |
| CDRA | Canadian Dory Racing Association |
| CDRA | Central Drag Racing Association |
| CDRO | China Drag Racing Open |
| CDSR | California Dual Sport Riders |
| CDSR | Chicagoland Dual Sport Riders |
| CES | Companies Embracing Sustainability |
| CFDR | Canadian Federation for Drone Racing |
| CFR | Canyon Factory Racing |
| CFRA | Checkered Flag Racing Association |
| CGB | Clinton Graceville Beardsley |
| CGRA | Columbia Gorge Racing Association |
| CGRT | Chip Ganassi Racing Teams |
| CGRT | Corner Grass Racing Team |
| CHRA | Continental Historic Racing Association |
| CHRB | California Horse Racing Board |
| CHRF | Club Handicap Racing Fleet |
| CHRIMS | California Horse Racing Information Management Systems |
| CIDB | Center for Intracelluar Delivery of Biologics |