| Acronym | Meaning |
| CBRN | Chemical |
| CBRNE | Chemical, Biological, Radiological, Nuclear, Explosive |
| CBS | Columbia Broadcasting System - Corps Battle Simulation |
| CBT | Cognitive Behaviour Therapy -Combat |
| CC | Many |
| CCA | Counter Command Activity |
| CCC | Corpus Christi College |
| CCCP | Central Committee Of The Communist Party - Cyrillic For SSSR (Soyuz Sovetskikh Sotsialisticheskikh Respublik |
| CCD | Charge-Coupled Device |
| CCG | Canadian Coast Guard - Collectible Card Game |
| CCH | Computer-Controlled Hostile |
| CCIF | Comit? Consultatif International Des Communications T?l?phoniques ? Grande Distance (French For International Telephone Consultative Committee |
| CCII | Command And Control Information Infrastructure |
| CCIR | Comit? Consultatif International Pour La Radio (French For Consultative Committee On International Radio |
| CCIT | Comit? Consultatif International T?l?graphique (French For International Telegraph Consultative Committee |
| CCITT | Comit? Consultatif International T?l?phonique Et T?l?graphique (French For International Telegraph And Telephone Consultative Committee |
| CCK | Cholecystokinin -Cocos (Keeling) Islands (ISO 3166 Trigram) |
| CCOC | Canadian Children's Opera Chorus |
| CCOP | Coalition Common Operating/Operational Picture |
| CCP | Casualty Collection Point - Communications Checkpoint - Contingency Communications Package |
| CCRAP | Canadian Conservative Reform Alliance Party |
| CCRP | Command And Control Research Program |
| CCRTS | Command And Control Research And Technology Symposium |
| CCSCS | Consultative Committee For Space Data Systems |
| CCSIL | Command And Control Simulation Interface Language (cecil) |
| CCSK | Cyclic Code Shift Keying |
| CCT | Current Commitments Team |
| CCTT | Close Combat Tactical Trainer |
| CD | Cadmium |
| CD | Candela |
| CD | Many |
| CD1 | Cluster Of Differentiation 1 (a Small Gene Family) |
| CDA | UK Centre For Defence Analysis |
| CDC | Centers For Disease Control And Prevention - Control Data Corporation - Cult Of The Dead Cow |
| CDD | Capabilities Development Document |
| CDE | Chemical Defence Equipment |
| CDEC | U.S. Combat Development Experimentation Center |
| CDF | California Department Of Forestry [and Fire Protection] - Common Data Format -Democratic Republic Of Congo Franc Congolais (ISO 4217 Currency Code) |
| CDIAC | Carbon Dioxide Information Analysis Center (see-dee-ack) |
| CDIPAF | Certified Diploma In Accounting And Finance |
| CDM | Clean Development Mechanism (Kyoto Protocol) - Cold Dark Matter (astronomy) |
| CDMA | Code Division Multiple Access |
| CDMSII | Cryogenic Dark Matter Search II |
| CDR | Commander |
| CDS | Chief Of The Defence Staff |
| CDT | Central Daylight Saving Time (UTC-5 Hours) |
| CDT | Commandant |
| CE | Cerium |
| CE | Chechen Language (ISO 639-1 Code) |
| CE | Many |