| Abbreviation | Definition |
|---|---|
| CCF | Component Cooling Filter |
| CCNB | Concerned Citizens for the Nuclear Breeder |
| CCNS | Concerned Citizens For Nuclear Safety |
| CDF | Collider Detector Facility |
| CDTN | Centro de Desenvolvimento da Tecnologia Nuclear |
| CDTN | Centro de Desenvolvimento de Tecnologia Nuclear |
| CFNS | Center for Frontiers in Nuclear Science |
| CLND | Civil Liability for Nuclear Damage |
| CMNG | Centro de Medicina Nuclear da Guanabara |
| CMPO | Creation Mathematics Parameter Operator (CMP-O):- The GOD’S 4 Basic Creation Mathematics Parameter O |
| CND | Campaign Nuclear Disarmament |
| CNFC | Closed Nuclear Fuel Cycle |
| CNIC | Citizens Nuclear Information Center |
| CNIC | Citizen's Nuclear Information Center |
| CNIC | Citizens' Nuclear Information Center |
| CNL | Canadian Nuclear Laboratories |
| CNLS | Classical Nuclear Localization Signal |
| CNMB | Central Nuclear Measurements Bureau |
| CNMT | Certification in Nuclear Medicine Technology |
| CNN | Central Nuclear Network |