| Acronym | Meaning |
| CCDTL | Coupled-cavity Drift-tube Linac |
| CCDW | Commensurate Charge-density Wave |
| CCDW | Coupled-channel Distorted-wave (quantum Method) |
| CCDZP | Correlation-consistent Double-zeta (plus) Polarization (basis Set) |
| CCE | Charge Composition Explorer |
| CCE | Capacitative Calcium Entry |
| CCE | Charge-collection Efficiency |
| CCE | Counterflow Centrifugal Elutriation |
| CCEA | Conventional Combustion Environmental Assessment |
| CCEH | Center For Coastal Ecosystem Health |
| CCF | Correlation Crystal Field |
| CCFET | Capacitively Controlled Field Effect Transistor |
| CCFL | Cold Cathode Fluorescent Lamp |
| CCFL | Countercurrent Flow Limitation |
| CCFO | Charge-charge Flux Overlap (model In Mol.-property Calcns.) |
| CCFOM | Charche-charge Flux-overlap Modified (model In IR Spectra Calcn.) |
| CCG | Constant Crystal Growth (model) |
| CCG | Continental Collision Granitoids |
| CCGF | Coupled Cluster Green Function |
| CCGM | Cabrera-Celli-Goodman-Manson (at. Scattering Theory) |
| CCGT | Closed Cycle Gas Turbine |
| CCGT | Combined Cycle Gas Turbine |
| CCHF | Crimean Congo Hemorrhagic Fever |
| CCHW | Citizens Clearinghouse For Hazardous Wastes |
| CCI | Charge Contrast Imaging |
| CCI | Chronic Constriction Injury |
| CCI | Complete Configuration Interaction |
| CCI | Contracted Configuration Interaction |
| CCI | Crevice Corrosion Index |
| CCID | Confidential Chemicals Identification System |
| CCIIM | Clearinghouse For Chemical Information Instructional Materials |
| CCIX | Continuous Countercurrent Ion Exchange |
| CCL | Drinking Water Contaminant Candidate List |
| CCL | Carotenoid-carrying Lipoprotein |
| CCLGO | Catalytic Cracked Light Gas Oil |
| CCLRC | Council For The Central Laboratory Of The Research Councils |
| CCM | Channeling Contrast Microscopy |
| CCM | Chemical Cleavage Of Mismatch |
| CCM | Complex Coordinate Method (in Calcns. On Quantum Tunneling) |
| CCM | Coupled-cluster Method (for Energy Level Calculations) |
| CCM | Crucible Ceramic Mold |
| CCM | Cyclic Cluster Model (in CNDO For Deep Levels In Solids) |
| CCM2 | Community Climate Model Version 2 |
| CCMC | Coupled-cluster Method With Multiconfiguration Reference State |
| CCMC-T2 | Coupled-cluster Multiconfigurational (double-excitation Method With Cluster Operator Approximated By T2) |
| CCME | Canadian Council Of Ministers Of The Environment |
| CCMET | Coupled-cluster Many-electron Theory |
| CCMGA | Core-corrected Modified Glauber Approxn. (for Scattering) |
| CCMP | Capacitively Coupled Microwave Plasma |
| CCMS | Committee On Challenges Of Modern Society (NATO) |