| Abbreviation | Definition |
|---|---|
| CTBA | Chinese Taipei Baseball Association |
| CTC | Canadian Tennis Centre |
| CTC | Capture The Chicken |
| CTC | Cyclists Touring Club |
| CTE | Countdown To Extinction |
| CTID | Chelsea Till I Die |
| CTMP | Canadian Tire Motorsport Park |
| CTMSF | Council of The Malta Shooting Federation |
| CTP | Closest To The Pin |
| CTR | Crash Team Racing |
| CTRT | Camel Toe Race Team |
| CTT | Certified Technology Trainer |
| CU | Cross Up |
| CUAD | Concordia University Athletic Department |
| CUB | Concordia University Baseball |
| CUBS | Chicago's United Baseball Society |
| CUNT | Cambridge University Netball Team |
| CUOC | Cambridge University Orienteering Club |
| CUPID | Cutting Up Playas In Dozens |
| CUSP | Community Urban Sports Project |