| CTIS | Crawler-Transporter Intercom System | In English | |
| CTL | Controller Tape Location | In English | |
| CTL | Combat Training Launch | In English | |
| CTL | Component Test Laboratory | In English | → Research institutes |
| CTL | Critical To Launch | In English | |
| CTL | Canoga Test Laboratory | In English | → Research institutes |
| CTL | C-Type Lectin | In English | → Biochemistry, biophysics |
| CTL | Computational Tree Logic | In English | → Software → Mathematics |
| CTM | Contract Technical Manager | In English | → 3474 |
| CTM | Crystalline Transitional Material | In English | |
| CTM | Combustion Theory Modelling | In English | → Serial publications, periodicals → Thermodynamics |
| CTM | Cordless Terminal Mobility | In English | → Telecommunications |
| CTMPC | Cambridge Topics in Mineral Physics and Chemistry | In English | → Serial publications, periodicals → Mineralogy |
| CTN | Canton Island | In English | |
| CTN | Certification Test Network | In English | |
| CTP | Communications Timing Procedure | In English | |
| CTP | Cyclic Time Processor | In English | |
| CTP | Course of Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| CtP | Computer to Plate | In English | → Computer science |
| CTPBEC | Chinese Taipei Pacific Basin Economic Committee | In English | → Economics |
| CTPD | Crew Training and Procedures Division | In English | |
| CTPECC | Chinese Taipei Pacific Economic Cooperation Committee | In English | → Economics |
| CTPhy | Classical Theoretical Physics | In English | → Serial publications, periodicals → Physics |
| CTR | Certification Test Requirement | In English | |
| CTR | Certification Test Review | In English | |
| CTR | Contract Technical Representative | In English | → 3474 |
| CTR | Carinthian Tech Research | In English | |
| CTR | Computing Tabulating Recording (Corporation) | In English | → Hardware → Knowledge management |
| CTRS | Component Test Requirements Specification | In English | |
| CTS | Command and Telemetry Subsystem | In English | |
| CTS | Computer Test Set | In English | → Computer science |
| CTS | Communications Technology Satellite | In English | → Spaceflight engineering, astronautics → Telecommunications |
| CTS | Communications and Tracking System | In English | |
| CTS | Console Test Set | In English | |
| CTS | Change Tracking System | In English | |
| CTS | Canadian Technology Satellite | In English | → Spaceflight engineering, astronautics |
| CTS | Coordinate Transformation System | In English | |
| CTS | Contractor Technical Service | In English | |
| CTS | Computerized Training System | In English | |
| CTS | Comprehensive Transponder Systems | In English | → Telecommunications |
| CTSA | Central Tibetan Schools Administration | In English | → Public administration, government → Education |
| CTSB | Cape Town Society for the Blind (www.ctsb.co.za) | In English | → Organizations and associations |
| CTSB | Community Television of the Southern Berkshires (www.ctsbtv.org) | In English | → Telecommunications |
| CTSB | Cycle Training Standards Board (www.ctsb.org.uk) | In English | → Sport, physical exercises |
| CTT | Command Transfer Tape | In English | |
| CTU | Central Timing Unit | In English | |
| CTU | Command (and) Telemetry Unit | In English | |
| CU | Crystal Unit | In English | |
| CU | Control Unit | In English | |
| CUB | Commonality Usage Board | In English | |
| CUC | Computer Usage Control | In English | → Computer science |
| CUDS | Cumulative Data Statistics | In English | |
| CUE | Common Usage Equipment | In English | |
| CUE | Command Uplink Electronics | In English | → Electronics |
| CUE | Command Use Equipment | In English | |
| CUE | Communication Unit Executor | In English | |
| CUED | Cambridge University Engineering Department (www.eng.cam.ac.uk) | In English | → 278 → Engineering, technology |
| CUF | Cross-Utilization File | In English | |
| CUG | Cray User Group | In English | → Computer simulation |
| CUHK | Chinese University of Hong Kong | In English | → Higher education, universities |
| CUI | Common Usage Item | In English | |
| CUI | Common User Interface | In English | → Human-computer interaction |
| CUIL | Common Usage Item List | In English | |
| CUL | Common Use List | In English | |
| CUP | Commonality Usage Proposal | In English | |
| CUP | Canadian University Press | In English | → Higher education, universities → Graphic industries, printing, publishing |
| CUP | California University of Pennsylvania | In English | → Higher education, universities |
| CUP | Constructor of Useful Parsers | In English | |
| CUP | Cambridge University Press | In English | → Higher education, universities → Graphic industries, printing, publishing |
| CURE | Connecticut United for Research Excellence (www.curenet.org) | In English | → Organizations and associations → Biological sciences → Medicine |
| CURE | Center for Usability Research and Engineering | In English | → Human-computer interaction |
| CUSIP | Committee on Uniform Security Identification Procedures | In English | |
| CUT | Coordinated Universal Time | In English | |
| CUTE | Clean Urban Transport Europe | In English | → Vehicle engineering → Transport and postal services |
| CUTM | Chemical Universal Turing Machine | In English | → Computer science → Chemistry |
| CUWAS | Customs Union of West African States | In English | → International economic cooperation |
| CV | Conventional Vehicle | In English | |
| CV | Core Vehicle | In English | |
| CV | Configuration Verification | In English | |
| CV | Deployable Payloads Operation | In English | |
| CV | Computer Vision | In English | |
| CV | Check Valve | In English | |
| CV | Cryptovariable | In English | |
| CV | Carrier Vehicle | In English | |
| CV | Coefficient of Variation | In English | |
| CVA | Convair Astronautics | In English | |
| CVAS | Configuration Verification Accounting System | In English | |
| CVCS | Chemical and Volume Control System | In English | → Nuclear technology |
| CVD | Chemical Vapor Deposition | In English | |
| CVDC | Cambridge Vehicle Dynamics Consortium | In English | → Organizations and associations → Vehicle engineering |
| CVE | Complete Vehicle Erector | In English | |
| CVF | Circular Variable Filter | In English | |
| CVF | Cobra Venom Factor | In English | → Biochemistry, biophysics |
| CVGIP | Computer Vision Graphics and Image Processing | In English | → Serial publications, periodicals → Computer-based techniques |
| CVI | Carbon Vapor Impregnation | In English | |
| CVI | Chemical Vapor Infiltration | In English | |
| CVI | Configuration Verification Inspection | In English | |
| CVIU | Computer Vision and Image Understanding | In English | → Serial publications, periodicals → Computer-based techniques |
| CVM | Christian Veterinary Mission (www.cvmusa.org) | In English | → Organizations and associations → Christianity → Veterinary medicine |
| CVMA | Canadian Veterinary Medical Association (www.canadianveterinarians.net) | In English | → Associations → Veterinary medicine |
| CVO | College of Veterinarians of Ontario (www.cvo.org) | In English | → Organizations and associations → Veterinary medicine |
| CVR | Configuration Verification Review | In English | |
| CVR | Change Verification Record | In English | |
| CVRD | Converter Variable Resistance to DC Voltage | In English | |
| CVS | Concurrent Versions System | In English | → Document processing |
| CVSD | Continuous Variable Slope Data | In English | |
| CVT | Concept Verification Testing | In English | |
| CVT | Communications Vector Table | In English | |
| CW | Command Word | In English | |
| CW | Continuous Waveform | In English | |
| CW | Continuous Wave | In English | |
| CWA | Controlled Work Area | In English | |
| CWA | Caution and Warning Annunciator | In English | |
| CWA | Clean Work Area | In English | |
| CWBS | Contract Work Breakdown Structure | In English | → 3474 |
| CWC | Chemical Weapons Convention = CAQ | Convención sobre las Armas Químicas | In Spanish = CAC | Convention sur les Armes Chimiques | In French = CAQ | Convenção sobre Armas Químicas | In Portuguese |
In English | → International relations → Military engineering |
| CWC | Concerned for Working Children | In English | → Organizations and associations → Labour, labour economics → Fundamental rights |
| CWDM | Coarse Wavelength Division Multiplexing | In English | → Networks, communication → Telecommunications |
| CWE | Caution and Warning Electronics | In English | → Electronics |
| CWE | Common Weakness Enumeration | In English | |
| CWE | Center for Women and Enterprise | In English | → Labour, labour economics → Feminism |
| CWE | Consortium for Worker Education | In English | → Labour, labour economics → Education |
| CWEA | Caution and Warning Electronic(s) Assembly | In English | → Electronics |
| CWEU | Caution and Warning Electronic(s) Unit | In English | → Electronics |
| CWFSP | Caution And Warning/Fire Suppression Panel | In English | |
| CWG | Constant-Wear Garment | In English | |
| CWG | Communications Working Group | In English | |
| CWG | Commonality Working Group | In English | |
| CWIHP | Cold War International History Project | In English | → History |
| CWIN | Child Workers in Nepal | In English | → Organizations and associations → Labour, labour economics → Fundamental rights |
| CWL | Campus-Wide Login (www.cwl.ubc.ca) | In English | → Networks, communication → Higher education, universities |
| CWL | Center for Women's Leadership (www3.babson.edu/cwl/) | In English | → Organizations and associations → Feminism |
| CWL | Catholic Women's League of Canada (www.cwl.ab.ca) | In English | → Organizations and associations → Roman catholic church |
| CWL | California Women Lawyers (www.cwl.org) | In English | → Organizations and associations → Law, jurisprudence |
| CWL | Cardiff International Airport (www.cwlfly.com) | In English | → Transport and postal services → Aeronautics, aircraft |
| CWLM | Caution and Warning Limit Module | In English | |
| CWM | Closed World Machine | In English | → Software |
| CWS | Caution and Warning System | In English | |
| CWSU | Condensate Water Servicing Unit | In English | → Environmental technology, water supply, waste management |
| CWT | Code Walk-Through | In English | |
| CXX | Chicago Climate Exchange | In English | → Meteorology, climatology |
| CY | Calendar Year | In English | |
| CYC | Cyclic Mission-Unique Process | In English | |
| CYEL | Creative Young Entrepreneur Luxembourg | In English | → Economics |
| CYI | Canary Islands | In English | |
| CYS | Cyprus Organization of Standardisation | In English | → Standardization |
| CYSDV | Cucurbit Yellow Stunting Disorder Virus | In English | → Virology → Agricultural sciences |
| CYSF | Cape York Space Facility | In English | → Astronomy → Spaceflight engineering, astronautics |
| CySys | Cybernetics and Systems | In English | → Serial publications, periodicals → 5197 |
| CZCS | Coastal Zone Color Scanner | In English | |
| CzJPh | Czechoslovak Journal of Physics | In English | → Serial publications, periodicals → Physics |
| CzMJ | Czechoslovak Mathematical Journal | In English | → Serial publications, periodicals → Mathematics |
| D | Aspartic Acid = D | অ্যাস্পার্টিক অ্যাসিড | In Bengali = D | Kyselina asparagová | In Czech = D | Asparaginsäure | In German = D | Ácido aspártico | In Spanish = D | Asparta acido | In Esperanto = D | Acide aspartique | In French = D | 아스파르트산 | In Korean = D | Asam aspartat | In Indonesian = D | Acido aspartico | In Italian = D | Àcid aspàrtic | In Catalan = D | חומצה אספרטית | In Hebrew = D | Asparagīnskābe | In Latvian = D | Asparto rūgštis | In Lithuanian = D | Aszparaginsav | In Hungarian = D | Asparaginezuur | In Dutch = D | アスパラギン酸 | In Japanese = D | Kwas asparaginowy | In Polish = D | Ácido aspártico | In Portuguese = D | Аспарагиновая кислота | In Russian = D | Asparagiinihappo | In Finnish = D | Asparaginsyra | In Swedish = D | Aspartat | In Turkish = D | Аспарагінова кислота | In Ukrainian |
In English | → Biochemistry, biophysics |
| DAA | Designated Approval Authority | In English | |
| DAAT | Distributed Architecture Analysis Tool | In English | |
| DAB | Docking And Berthing | In English | |
| DAB | Defense Acquisition Board | In English | → Military affairs |
| DAB | Digital Audio Broadcasting | In English | → Telecommunications |
| DABM | Defense Against Ballistic Missiles | In English | → Military affairs → Military engineering |
| DABS | Discrete Address Beacon System | In English | |
| DAC | Days After Contract | In English | → 3474 |
| DAC | Data Acquisition Camera | In English | |
| DAC | Data Acquisition and Control | In English | |
| DAC | Digital-To-Analog Converter | In English | → Computer science → Electronics |
| DAC | Delayed Action Command | In English | |
| DACB | Data Acquisition Control Buffer | In English | |
| DACBU | Digital Acquisition and Control Buffer Unit | In English | |
| DACBU | Data Acquisition and Control Buffer Unit | In English | |
| DACP | Data Acquisition, Control, and Processing | In English | → Data |
| DACP | Data Acquisition (and) Control Processor | In English | → Data |
| DACS | Data Acquisition and Control System | In English | → Data |
| DACS | Digital Acquisition and Control System | In English | |
| DACS | Data Acquisition and Control Subsystem | In English | |
| DACT | Disposable Absorption Collection Trunk | In English | |
| DAD | Data Acquisition and Distribution | In English | → Data |
| DAD | Due At Department | In English | |
| DADE | Data Acquisition and Documentation Equipment | In English | → Data |
| DADS | Dual Air Density Satellite | In English | → Spaceflight engineering, astronautics |
| DAE | Data Acquisition Equipment | In English | → Data |
| DAF | Data Analysis Facility | In English | → Data |
| DAFT | Data Acquisition Frequency Table | In English | → Data |
| DAFZA | Dubai Airport Free Zone Authority | In English | → 33972 |
| DAG | Directed Acyclic Graph | In English | |
| DAI | Deferred Acceptance Item | In English | |
| DAIS | Data Avionics Information System | In English | → Data → Aeronautics, aircraft |
| DAL | Data Acquisition List | In English | → Data |
| DAL | Data-Aided Loop | In English | |
| DAM | Draft Amendment | In English | |
| DAM | Double-Aluminized Mylar | In English | → Chemical technology |
| DAM | Digital Asset Management | In English | → Document processing → Knowledge management |
| DAMA | Data Management Association (www.dama.org) | In English | → Associations → Knowledge management → Data |
| DAMA | Demand Assigned Multiple Access | In English | → Telecommunications → Spaceflight engineering, astronautics |
| DAML | DARPA Agent Markup Language | In English | → Programming languages → Data |
| DAMMPS | Damping And Metal Matrix For Precision Structure | In English | |
| DANASAT | Direct-Ascent Nuclear ASAT | In English | → Nuclear technology |
| DANTE | Delivery of Advanced Network Technology to Europe | In English | → Networks, communication |
| DAOAR | Dominion Astrophysical Observatory Annual Report | In English | → Serial publications, periodicals → Astronomy |
| DAOJ | Directory of Open Access Journals | In English | → Libraries → Serial publications, periodicals → Networks, communication |
| DAP | Directory Access Protocol | In English | |
| DAP | Digital Autopilot | In English |
|