| Acronym | Meaning |
| CCMSD | Computational Center For Molecular Structure And Design |
| CCMST | Co-ordinating Committee On Marine Science And Technology (UK) |
| CCN | Cloud Condensation Nucleus |
| CCO | Coupled-channel-optical (potential |
| CCOHS | Canadian Centre For Occupational Health And Safety |
| CCOI | Coupled-channel Optical (potential Method With Only The) Imaginary (part Of The Complex Polarization Potential) |
| CCOM | Coupled Channel Optical Method |
| CCOSM | Chemistry And Circulation Occultation Spectroscopy Mission |
| CCP | Capacitively Coupled Plasma |
| CCPA | Canadian Chemical Producers Association |
| CCPA | Cemented Carbide Producers Association |
| CCPA | Cellular Coherent-potential Approximation (for Electronic Structure Calcns.) |
| CCPA | Cluster Coherent Potential Approximation (for Electronic Structure Calcns.) |
| CCPA | Constant Centrifugal Potential Approximation |
| CCPD | Charge-coupled Photodiode Device |
| CCPE | Charge Core Potential Energy Method (for Conformational Analysis) |
| CCPP | Calcium Carbonate Precipitation Potential |
| CCPP | Combined Cycle Power Plant |
| CCPP | Contagious Caprine Pleuropneumonia |
| CCPPA | Coupled-cluster Polarization-propagator Approxn. |
| CCPS | Center For Chemical Process Safety |
| CCQC | Center For Computational Quantum Chemistry |
| CCR | Conradson Carbon Residue |
| CCR | Council For Chemical Research |
| CCR | Close-coupled Representation |
| CCR | Close-coupling R-matrix |
| CCR | Complex Coordinate Rotation (method For Calcns. Of Resonances In Scattering) |
| CCR | Conventional Controlled Rolling |
| CCRIS | Chemical Carcinogenesis Research Information System |
| CCRM | Coupled-channel Reactance Matrix (in Atom Surface Scattering) |
| CCRMP | Canadian Certified Ref. Materials Project |
| CCRSP | California Cooperative Remote Sensing Project |
| CCS | Classical Centrifugal Sudden (in Calcns. On Reactions) |
| CCS | Cold Cranking Simulator |
| CCS | Contract Compliance Screening |
| CCS | Corrected Coupled-states (method For Mol.-scattering Calcns.) |
| CCSA | Classical Cintrifugal-sudden Approxn. |
| CCSA | Const. Current Stripping Anal. |
| CCSC | Charge And Configuration Self-consistency |
| CCSD | Coupled Cluster With Single And Double Excitation |
| CCSD(T) | Coupled-cluster (with) Single (and) Double (and Perturbative) Triple (excitations) |
| CCSD-ED | Coupled-cluster Method With Single And Double Excitations-energy Derivative |
| CCSD-EH | CCSD-effective Hamiltonian |
| CCSD-GF | CCSD-green Function |
| CCSD-UED | CCSD-unrelaxed Energy Derivative |
| CCSDS | Consultative Committee For Space Data Systems |
| CCSDT | Coupled Cluster With Single |
| CCSDTQ | CCSDT (with) Quadruple (excitations) |
| CCSDTQP | CCSDTQ (and) Pentuple (excitations) |
| CCSEM | Computer-controlled Scanning Electron Microscopy |