| CA | Certificate Authority | - | Human Genome |
| CAD | Computer-Aided Design | - | Human Genome |
| CAE | Computer-Aided Engineering | - | Human Genome |
| CASE | Computer-Aided Software Engineering | - | Human Genome |
| CAV | Constant Angular Velocity | - | Human Genome |
| CBT | Computer-Based Training | - | Human Genome |
| CCD | Charge-Coupled Device | - | Human Genome |
| CCI | Common Content Inspection | - | Human Genome |
| CCITT | Consultative Committee For International Telephony And Telegraphy | - | Human Genome |
| CD | Carrier Detect | - | Human Genome |
| CD-I | Compact Disc-Interactive | - | Human Genome |
| CD-PROM | Compact Disc-Programmable Read Only Memory | - | Human Genome |
| CD-R | Compact Disc-Recordable | - | Human Genome |
| CD-ROM | Compact Disc, Read Only Memory | - | Human Genome |
| CD-RW | Compact Disc-Rewritable | - | Human Genome |
| CDC | Cult Of The Dead Cow | - | Human Genome |
| CDDI | Copper Data Distribution Interface | - | Human Genome |
| CDF | Channel Definition Format | - | Human Genome |
| CDFS | Compact Disk File System | - | Human Genome |
| CDI | Common Data Interface | - | Human Genome |
| CDIF | CASE Definition Interchange Facility | - | Human Genome |
| CDMA | Code Division Multiple Access | - | Human Genome |
| CDPD | Cellular Digital Packet Data | - | Human Genome |
| CDRAM | Cached Dynamic Random Access Memory | - | Human Genome |
| CERN | Conseil Europeen Pour Le Recherche Nucleaire | - | Human Genome |
| CERT | Character Error Rate Testing (European Organization For Nuclear Research) As In, Large Hadron Collider | - | Human Genome |
| CERT | The CERT Coordination Center | - | Human Genome |
| CFI | Common Flash Interface | - | Human Genome |
| CGA | Color Graphics Adapter | - | Human Genome |
| CGI | Common Gateway Interface | - | Human Genome |
| CGM | Computer Graphics Metafile | - | Human Genome |
| CHAP | Challenge Handshake Authentication Protocol | - | Human Genome |
| CHRP | Common Hardware Reference Platform | - | Human Genome |
| CIDR | Classless Inter-Domain Routing | - | Human Genome |
| CIE | Color Model = Commission Internationale De L'Eclairage Color Model | - | Human Genome |
| CIFF | Camera Image File Format | - | Human Genome |
| CIR | Committed Information Rate | - | Human Genome |
| CISC | Complex Instruction-Set Computing | - | Human Genome |
| CISC | Creative Integrated Solutions Consortium, LLC | - | Human Genome |
| CIX | Commercial Internet Exchange Association | - | Human Genome |
| CLEC | Competitive Local Exchange Carriers | - | Human Genome |
| CLV | Constant Linear Velocity | - | Human Genome |
| CME | Common Malware Enumeration | - | Human Genome |
| CMIP | Common Management Information Protocol | - | Human Genome |
| CML | Chemical Markup Language | - | Human Genome |
| CMMI | Capability Maturity Model Integration | - | Human Genome |
| CMOS | Complementary Metal-Oxide Semiconductor | - | Human Genome |
| CMS | Color Management System | - | Human Genome |
| CMS | Content Management System | - | Human Genome |
| CMTS | Cable Modem Termination System | - | Human Genome |
| CMYK | Cyan Magenta Yellow Black (Key) | - | Human Genome |
| CNG | Calling Tone | - | Human Genome |
| COBOL | Common Business Oriented Language | - | Human Genome |
| CODASYL | Conference On Data Systems Languages | - | Human Genome |
| CODEC | Compression/Decompression | - | Human Genome |
| COM | Component Object Model | - | Human Genome |
| COMDEX | Communications And Data Processing Exposition | - | Human Genome |
| CORBA | Common Object Request Broker Architecture | - | Human Genome |
| CP/M | Control Program For Microprocessors (Control Program/Monitor) | - | Human Genome |
| CPE | Customer Premises Equipment | - | Human Genome |
| CPS | Characters Per Second | - | Human Genome |
| CPU | Central Processing Unit | - | Human Genome |
| CR | Carriage Return | - | Human Genome |
| CRAM | Card RAM | - | Human Genome |
| CRAM | Computational RAM | - | Human Genome |
| CRC | Cyclic Redundancy Check (Code) | - | Human Genome |
| CRM | Customer Relationship Management | - | Human Genome |
| CRT | Cathode-Ray Tube | - | Human Genome |
| CSDGM | Content Standard For Digital Geospatial Metadata | - | Human Genome |
| CSMA/CA | Carrier Sense Multiple Access/Collision Avoidance | - | Human Genome |
| CSMA/CD | Carrier Sense Multiple Access/Collision Detection | - | Human Genome |
| CSS | Cascading Style Sheets | - | Human Genome |
| CSTN | Color Supertwist Nematic | - | Human Genome |
| CSU | Channel Service Unit | - | Human Genome |
| CSV | Comma-Separated Value / Variable | - | Human Genome |
| CTI | Computer-Telephony Integration | - | Human Genome |
| CTP | Community Technical Preview | - | Human Genome |
| CTR | Click-Through Ratio | - | Human Genome |
| CUA | Common User Access | - | Human Genome |
| CWM | Common Warehouse Metadata | - | Human Genome |
| CWR | Congestion Window Reduced | - | Human Genome |
| CYA | Cover Your Ass | - | Human Genome |
| CYBORG | Cybernetic Organism | - | Human Genome |
| CYMK | Cyan Yellow Magenta Black (Key) | - | Human Genome |
| C&A | Certification and Accreditation
| - | Human Genome |
| CAD-CAM | computer-aided design and computer-aided manufacturing
| - | Human Genome |
| CALEA | Communications Assistance for Law Enforcement Agencies
| - | Human Genome |
| CAP | II computer access protocol number II
| - | Human Genome |
| CAS | channel associated signaling
| - | Human Genome |
| CBB | common backbone
| - | Human Genome |
| CBD | commercial business district
| - | Human Genome |
| CBR | constant bit rate
| - | Human Genome |
| CBS | committed burst size
| - | Human Genome |
| CBWFQ | class based weighted fair queuing
| - | Human Genome |
| CCAMP | common control and measurement plane
| - | Human Genome |
| CCB | Change Control Board
| - | Human Genome |
| CCE | call control element
| - | Human Genome |
| CCEP | NSA Commercial ComSec Endorsement Program
| - | Human Genome |
| CCIR | International Radio Consultative Committee
| - | Human Genome |
| Committee | | - | Human Genome |
