| C | A Programming Language Used Extensively In Systems Software | - | Business and Finance |
| C&C | Consultation And Cooperation Agreement | - | Business and Finance |
| C&DH | Command And Data Handling | - | Business and Finance |
| C&DM | Configuration And Data Management | - | Business and Finance |
| C++ | An Object-oriented Programming Language Based On C | - | Business and Finance |
| C/D | Integrated Phase C And Phase D Contract | - | Business and Finance |
| C2F3CL3 | CFC-113 | - | Business and Finance |
| C2FBR2 | Halon 2402 | - | Business and Finance |
| CA | Citizen Act | - | Business and Finance |
| CAA | Clean Air Act | - | Business and Finance |
| CAA | Concepts Analysis Agency | - | Business and Finance |
| CAAA | Clean Air Act Amendments | - | Business and Finance |
| CAAC | Civil Aviation Administration Of China | - | Business and Finance |
| CAALS | Consortium On Automated Standards | - | Business and Finance |
| CAAP | Composition And Acidity Of SE Asian Precipitation | - | Business and Finance |
| CAB | CCSM Advisory Board | - | Business and Finance |
| CABALS | Carrier Balloon System | - | Business and Finance |
| CAC | Central Analysis Center (NMC) | - | Business and Finance |
| CAC | Climate Analysis Center | - | Business and Finance |
| CAC | California Administrative Code | - | Business and Finance |
| CACGP | Commission On Atmospheric Chemistry And Global Pollution | - | Business and Finance |
| CACM | Communications Of The ACM | - | Business and Finance |
| CACR | Commission On Air Chemistry And Radioactivity | - | Business and Finance |
| CAD | Computer-Aided Design | - | Business and Finance |
| CAD | Computer-Aided Dispatch | - | Business and Finance |
| CAD | Control Alternate Delete (PC Keyboard Reset Sequence) | - | Business and Finance |
| CAD | Coronary Artery Disease | - | Business and Finance |
| CAD/CAM | Computer-design/computer-aided Manufacturing | - | Business and Finance |
| CADD | Computer-Aided Design And Drafting | - | Business and Finance |
| CADRE | Center For Analysis Of Dynamics Of Atmospheric Regions | - | Business and Finance |
| CADRE | Center For Analysis Of The Dynamics Of Regional Ecosystems | - | Business and Finance |
| CAE | Cooler | - | Business and Finance |
| CAE | Computer Aided Engineering | - | Business and Finance |
| CAENEX | Complex Atmospheric Energetics Experiment | - | Business and Finance |
| CAFE | Corporate Average Fuel Economy | - | Business and Finance |
| CAG | Carcinogen Assessment Group | - | Business and Finance |
| CAG | Convective Airspace Guidance | - | Business and Finance |
| CAG | Computing Advisory Group | - | Business and Finance |
| CAGE | Continental Africa GATE Experiment | - | Business and Finance |
| CAGEX | CERES/ARM/GEWEX Experiment | - | Business and Finance |
| CAI | Computer-aided Instruction | - | Business and Finance |
| CAI | Controlled Air Incinerator | - | Business and Finance |
| CAL | Computer-aided Learning | - | Business and Finance |
| CAL | Cray Assembly Language | - | Business and Finance |
| CAL | Continental Air Lines | - | Business and Finance |
| CAL/VAL | Calibration/Validation | - | Business and Finance |
| CALCOMP | California Computer Products | - | Business and Finance |
| CALCRUST | Consortium For Study Of The California Crust | - | Business and Finance |
| CALLS | California Academia Libraries List Of Serials | - | Business and Finance |
| CALS | Computer-aided Acquisition And Logistics Support | - | Business and Finance |
| CALTECH | California Institute Of Technology | - | Business and Finance |
| CALUTRON | California University Cyclotron | - | Business and Finance |
| CAM | Computer Aided Machining | - | Business and Finance |
| CAM | Cost Account Manager | - | Business and Finance |
| CAM | Computer-aided Manufacturing | - | Business and Finance |
| CAM | Constant Air Monitor | - | Business and Finance |
| CAM | Cost Account Manager | - | Business and Finance |
| CAMAC | Computer-automated Measurement And Control | - | Business and Finance |
| CAMEX | Coastal AMOS (Experiment) | - | Business and Finance |
| CAMP | Committee On Aeronautical Meteorological Problems | - | Business and Finance |
| CAO | Central Aerological Observatory | - | Business and Finance |
| CAOS | Center For Atmosphere/Ocean Studies | - | Business and Finance |
| CAP | Civil Air Patrol | - | Business and Finance |
| CAP | Corporate Affiliates Program | - | Business and Finance |
| CAP | Cost Account Plan | - | Business and Finance |
| CAP | CGD Advisory Panel | - | Business and Finance |
| CAPE | Convection And Precipitation/Electrification Experiment | - | Business and Finance |
| CAPE | Convective Available Potential Energy | - | Business and Finance |
| CAPOS | Chemistry And Production Of Smoke | - | Business and Finance |
| CAPP | Center For Applied Parallel Processing | - | Business and Finance |
| CAPPPI | Citizen Ambassador Program Of People To People International | - | Business and Finance |
| CAPS | Center For The Analysis And Prediction Of Storms | - | Business and Finance |
| CAPS | Cassini Plasma Spectrometer | - | Business and Finance |
| CAPTEX | Cross-Appalachian Tracer Experiment | - | Business and Finance |
| CAR | Central African Republic | - | Business and Finance |
| CARA | Center For Astrophysical Research In Antarctica | - | Business and Finance |
| CARB | California Air Resources Board | - | Business and Finance |
| CARD | Citizens Against Radioactive Dumping | - | Business and Finance |
| CARL | Colorado Alliance Of Research Libraries | - | Business and Finance |
| CARP | Carpenter Research Project | - | Business and Finance |
| CARP | Colorado-Amudarya Rivers Project | - | Business and Finance |
| CARS | Coherent Anti-Stokes Raman Spectroscopy | - | Business and Finance |
| CARSS | Center For Atmospheric And Remote Sounding Studies | - | Business and Finance |
| CART | Cloud And Radiation Testbed | - | Business and Finance |
| CAS | Cooperative Application Satellite | - | Business and Finance |
| CAS | Committee On Atmospheric Sciences | - | Business and Finance |
| CAS | Commission For Atmospheric Science | - | Business and Finance |
| CAS | Climate Analysis Section | - | Business and Finance |
| CAS | Center For Automotive Safety | - | Business and Finance |
| CAS | Chemical Abstract Service | - | Business and Finance |
| CASAC | Clean Air Scientific Advisory Committee | - | Business and Finance |
| CASC | Coalition For Academic Supercomputer Centers | - | Business and Finance |
| CASE | Computer Aided Software Engineering | - | Business and Finance |
| CASES | Cooperative Atmosphere Surface Exchange Study | - | Business and Finance |
| CASH | Commercial Aviation Sensing Humidity Program | - | Business and Finance |
| CASH | Commercial Aviation Sensing Of Humidity | - | Business and Finance |
| CASI | Canadian Aerospace Institute | - | Business and Finance |
| CASP | Canadian Atlantic Storms Project (or Program) | - | Business and Finance |
| CASS | Computer-Assisted Surveillance System | - | Business and Finance |
| CAST | Council For Agricultural Science And Technology | - | Business and Finance |
