| Abbreviation | Definition |
|---|---|
| CJN | Commission on Judicial Nomination |
| CLAAC | Commission latino-américaine de l’aviation civile (French: LatiAmerican Civil Aviation Commission) |
| CLEST | Commission on Law Enforcement Standards and Training |
| CMAC | California Medical Assistance Commission |
| CMC | Crime and Misconduct Commission |
| CMEC | Child Maintenance and Enforcement Commission |
| CMG | Commission on Mathematical Geophysics |
| CMTW | Commission on Mineral and Thermal Waters |
| CNAA | Commission on Native American Affairs |
| CNAA | Commission on North American Affairs |
| CNAD | Commission Nationale Anti Dopage |
| CNDS | Commission |
| CNESST | Commission des Normes, de l’Équité, de la Santé et de la Sécurité du Travail |
| CNESST | Commission des Normes, de lÉquité, de la Santé et de la Sécurité du Travail |
| CNFC | Commission Nationale de la Flotte Côtière |
| CNGR | Commission on the National Guard and Reserves |
| CNIL | Commission nationale de l'informatique et des libertés |
| CNOIA | Commission Nationale des Opérations Immobilières et de l'Architecture (French: National Commission on Real Estate Transactions and Architecture) |
| CNPU | commission on Nomenclature Properties and Units |
| CNSC | Canadian Nuclear Safety Commission |