| Abk. | Bedeutung | Kontext |
| C | Country | X.400-Adressierung, Land |
| C | Kollektor | Transistor |
| C | privater Konsum | VWL |
| C | Kohlenstoff | Chemisches Element |
| Ca | Calcium | Chemisches Element |
| CA | Certificate Authority | Zertifizierung |
| CACM | Communication of the ACM | Zeitschrift |
| CAD | Computer Aided Design | BWL |
| CAE | Computer Aided Engineering | BWL |
| CAI | Computer Aided Industry | BWL |
| CAM | Common Access Method | ANSI |
| CAM | Content Addressable Memory | |
| CAM | Computer Aided Manufacturing | BWL |
| CAO | Computer Aided Office | BWL |
| CAP | Computer Aided Planning | BWL |
| CAP | Computer Aided Production | BWL |
| CAPISCE | Computer Architecure for Production Information Systems in a Competitive Environment | |
| CAPP | Computer Auded Process Planning | |
| CAQ | Computer Aided Quality Assurance | BWL |
| CASE | Computer Aided Software-Engineering | |
| CBC | Cipher Block Chaining | Kryptographie |
| CBD | Commerce Business Daily | |
| CBIS | Computer Based Information Systems | |
| CBOT | Chicage Board Of Trade | Finanzmarkt |
| CC | Carbon Copy | |
| CC | Chip-Carrier | Montagerahmen für Chip |
| CC | Clearing Center | EDI |
| CCC | Chaos Computer Club | |
| CCD | Charge Coubled Device | |
| CCEP | Commercial COMSEC Endorsement Program | |
| CCITT | Comité Consultatif International Télégraphique et Téléphonique | heute ITU |
| CCR | Central Contractor Registration | FACNET |
| CCS | Common Control Set | |
| CCSR | Centre for Computing and Social Responsibility, Leicester | |
| Cd | Cadmium | Chemisches Element |
| CD | Compact Disc | |
| CD | Corps Diplomatique | |
| CD | Corporate Design | |
| CD-ROM | Compact Disc-Read Only Memory | |
| CDDI | Copper Distributed Data Interface | |
| CDF | Channel Defintion Format | CDF |
| CDL | Component Definition Language | Corba |
| CDO | Collaboration Data Objects | |
| CdTe | Cadmiumtellurid | Solarzellen |
| CDU | Christlich Demokratische Union | |
| CEFIC | Conseil Européen des Féderations de líndustrie Chimique | |
| CEO | Chief Executive Officer | |
| CEPIS | Council of European Professional Informatics Societies | |
| CEPT | Conference Europeenne des administrations des Postes et des Telecommunications | |
| CERN | Conseil Européen pour la Recherche Nucléaire | |
| Cf | Californium | Chemisches Element |
| CFF | Compagnie Francaise de Ferraille S.A. | |
| CGI | Common Gateway Interface | |
| CGI | Computer Graphics Interface | |
| CH | Schweiz | Autokennzeichen |
| CFR | Cost and Freight | Incoterms |
| CI | Corporate Identity | |
| CIAO | Critical Infrastructure Assurance Center | |
| CIB | Computer Integrated Business | BWL |
| CIDCAM | CIM System with Distributed Data Base and Configurable Moduls | |
| CIDF | Control Interval Definition Field | VSAM |
| Cie | Companie | kaufmännische Gesellschaft |
| CIF | Cost, Insurance, Freight | Incoterms |
| CIM | Computer integrated manufacturing | BWL |
| CIMOSA | CIM Open System Architecture | Informatik |
| CIO | Chiefe Information Officer | |
| CIP | Carriage and Insurcance Paid | Incoterms |
| CIP | Computer Integrated Processing | |
| CIS | Kupferindiumdiselenid | Solarzellen |
| CISC | Complex Instruction Set Computer | |
| CKD | Count-Key-Data | Festplatten-Architektur |
| Cl | Chlor | Chemisches Element |
| CL | Capability List | |
| CLAA | Carry-Look-Ahead Adder | |
| CLAG | Carry-Look-Ahead Generator | |
| CLSR | Computer Law & Security Report | Zeitschrift |
| CLNP | Connection-Less Networking Protocol | |
| cm | Zentimeter | |
| cm | Controller Magazin | Zeitschrift |
| Cm | Curium | Chemisches Element |
| CMAR | Control Memory Address Register | |
| CMC | Common Messaging Calls | |
| CML | Chemical Markup Language | XML |
| CMOS | Complementary Metal Oxide Semiconductor | |
| CN | Common Name | X.400-Adressierung, Allgemeiner Name |
| CNC | Computerized Numerical Control | BWL |
| CNE | Certified Novell Engineer | |
| CNF | Chomsky Normalform | theoretische Informatik |
| Co | Kobalt | Chemisches Element |
| COBOL | Common Business Oriented Language | |
| COBRAS | Client-Oriented Branch Reporting and Analysis System | Informatik |
| CODASYL | Conference on Data Systems Languages | |
| COMECON | Council for Mutual Economic Assistance/Aid | |
| COMN | Common Object Modelling Language | |
| CONQUEST | Conference on Quality Engineering in Software Technology | |
| CORBA | Common Object Request Broker Architecture | |
| CORDIS | Community Research and Development Information Service | |
| COS-MOS | Complementary Symmetry Metal Oxide Semiconductor | |
| c.p. | ceteris paribus | |
| CPDE | Computer Products Distribution & Logistics Europe | |
| CPDP | Cellular Digital Packet Data | |
| CPM | Critical Path Method | |
| CPU | Central Processing Unit, Prozessor, Zentraleinheit | |
| CPT | Carriage Paid To | Incoterms |
| CPV | Common Procurement Vocabulary | SIMAP |
| Cr | Chrom | Chemisches Element |
| CR | Computer und Recht | Zeitschrift |
| CRA | Current Record of Area | |
| CRC | Cyclic Redundancy Check | |
| CRC | Class Responsibility Collaboration | Softwaremodellierung |
| CRM | Customer Relationship Management | |
| CRR | Current Record of Record | |
| CRS | Current Record of Set | |
| CRU | Current Record of Run Unit | |
| Cs | Cäsium | Chemisches Element |
| CSCD | Current Sensing Completition Detection | Elektrotechnik |
| CSG | Constuctive Solid Geometry | |
| CSLIP | Compressed Serial Line Internet Protocol | |
| CSMA/CD | Carrier-Sense Multiple Access with Collision Detection | Ethernet |
| CSNW | Client Service for Netware | Microsoft Windows NT |
| CSP | Cross System Production | IBM |
| CSS | Cascading Style Sheets | Internet |
| CSSR | Ceskosolvenská Socialistická Republica, Tschechsolowakei | |
| CSU | Christlich Soziale Union | |
| CSU | Channel Service Unit | |
| CSV | Comma Separated Values | |
| CTI | Computer Telephony Integration | Informatik |
| Cu | Kupfer | Chemisches Element |
| Cu2O | Kupferoxidul | Halbleiter |
| CVJM | Christlicher Verein Junger Männer | |
| CYK | Cocke, Younger, Kasami | theoretische Informatik |