| Abbreviation | Definition |
|---|---|
| CTHA | Canadian Tamils Humanitarian Association |
| CTHF | Canadian Team Handball Federation |
| CTHS | Canadian Thoroughbred Horse Society |
| CTHS | Canadian Tire Hockey School |
| CTL | Canadian Threadall Limited |
| CTMP | Canadian Tire Motorsport Park |
| CTOT | Canadian Trade Office in Taipei |
| CTRA | Canadian Therapeutic Recreation Association |
| CTRF | Canadian Tobacco Research Foundation |
| CTRS | Canadian Therapeutic Recreation Specialist |
| CTSA | Canadian Table Soccer Association |
| CTSB | Canada Transportation Safety Board |
| CTTA | Canadian Tactical Training Academy |
| CTTC | Canadian Toy Testing Council |
| CTVG | Canadian Technical and Vocational Group |
| CTVNN | Canadian TeleVision News Network |
| CUA | Canadian Urological Association |
| CUAJ | Canadian Urological Association Journal |
| CUC | Canadian Ultimate Championships |
| CUC | Canadian University College |