| Abbreviation | Definition |
|---|---|
| CSPA | California Sportfishing Protection Alliance |
| CSPO | Canadian Scenario Paintball Operations |
| CSR | Community Sports and Recreation |
| CSR | Composite Speed Rating |
| CSSD | Certified Specialist In Sports Dietetics |
| CSSI | Collegiate Shooting Sports Initiative |
| CST | Carthage Skate Team |
| CST | Cox Sports Television |
| CST | Custom Sports Truck |
| CSU | Carlisle Skater Union |
| CSUA | Calgary Softball Umpires Association |
| CSUA | Collegiate Softball Umpires Association |
| CSVA | Colorado Senior Volleyball Association |
| CSVA | Colorado Springs Velodrome Association |
| CSVB | Club Superior VolleyBall |
| CSVC | Cincinnati Sand Volleyball Club |
| CSVC | Cut Shot Volleyball Club |
| CSVV | ClubSport Valley Vista |
| CSYW | Colorado State Youth Wrestling |
| CTA | Colorado Tennis Association |