| CSS | Computer Subsystem | In English | |
| CSS | Cascading Style Sheet | In English | → Document processing |
| CST | Crew Software Trainer | In English | → Software |
| CSTA | Crew Software Training Aid | In English | → Software |
| CSTI | Conseil Stratégique des Technologies de l’Information | In French | → Organizations and associations → Telecommunications |
| CSTIT | Computer Speech, Text and Internet Technology | In English | → Software → Internet |
| CSV | Comma Separated Value | In English | → Data |
| CTI | Couplage Téléphonie Informatique | In French | → Telecommunications |
| CTI | Computer Telephony Integration | In English | → Telecommunications |
| CTIT | Centrum voor Telematica en Informatica Technologie | In Dutch | → Telecommunications |
| CTL | Computational Tree Logic | In English | → Software → Mathematics |
| CtP | Computer to Plate | In English | |
| CTR | Computing Tabulating Recording (Corporation) | In English | → Hardware → Knowledge management |
| CTS | Computer Test Set | In English | |
| CUC | Computer Usage Control | In English | |
| CUDI | Corporación Universitaria para el Desarrollo de Internet | In Spanish | → Telecommunications |
| CUG | Cray User Group | In English | → Computer simulation |
| CUI | Common User Interface | In English | → Human-computer interaction |
| CULLT | Club des Utilisateurs des Logiciels Libres en Tunisie | In French | → Organizations and associations → Software |
| CULTe | Club des Utilisateurs de Linux de Toulouse et des environs | In French | → Software → Operating systems |
| CURE | Center for Usability Research and Engineering | In English | → Human-computer interaction |
| CUTM | Chemical Universal Turing Machine | In English | → Chemistry |
| CV-ATOD | Centro Virtual de Información sobre Alcohol, Tabaco y otras Drogas = VC-ATOD | Virtual Clearinghouse on Alcohol, Tobacco, and Other Drugs | In English |
In Spanish | → Networks, communication → Medicine |
| CVGIP | Computer Vision Graphics and Image Processing | In English | → Serial publications, periodicals → Computer-based techniques |
| CVIU | Computer Vision and Image Understanding | In English | → Serial publications, periodicals → Computer-based techniques |
| CVS | Concurrent Versions System | In English | → Document processing |
| CWDM | Coarse Wavelength Division Multiplexing | In English | → Networks, communication → Telecommunications |
| CWI | Centrum voor Wiskunde en Informatica | In Dutch | |
| CWL | Campus-Wide Login (www.cwl.ubc.ca) | In English | → Networks, communication → Higher education, universities |
| CWM | Closed World Machine | In English | → Software |
| DAC | Digital-To-Analog Converter | In English | → Electronics |
| 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 |
| DAD | Data Acquisition and Distribution | In English | → Data |
| DADE | Data Acquisition and Documentation Equipment | In English | → Data |
| DAE | Data Acquisition Equipment | In English | → Data |
| DAF | Data Analysis Facility | In English | → Data |
| DAFT | Data Acquisition Frequency Table | In English | → Data |
| DAGM | Deutsche Arbeitsgemeinschaft für Mustererkennung | In German | → Associations → Computer-based techniques |
| DAI | Détection Automatique d'Incident | In French | → Image processing → Transport and postal services |
| DAIS | Data Avionics Information System | In English | → Data → Aeronautics, aircraft |
| DAISY | Dynamisches Auskunfts- und Informationssystem | In German | → Data |
| DAL | Data Acquisition List | In English | → Data |
| DALI | Digits, Architectures et Logiciels Informatiques | In French | → Software → Architecture |
| DAM | Digital Asset Management | In English | → Document processing → Knowledge management |
| DAMA | Data Management Association (www.dama.org) | In English | → Associations → Knowledge management → Data |
| DAML | DARPA Agent Markup Language | In English | → Programming languages → Data |
| DANTE | Delivery of Advanced Network Technology to Europe | In English | → Networks, communication |
| DAOJ | Directory of Open Access Journals | In English | → Libraries → Serial publications, periodicals → Networks, communication |
| DAP | Décodage Acoustico-Phonétique | In French | → Computer-based techniques → Telecommunications → Linguistics |
| DAS | Digital Avionics System | In English | → Computer-based techniques → Aeronautics, aircraft |
| DAU | Data Acquisition Unit | In English | → Data |
| DAV | Data Available | In English | → Data |
| DAVL | Data Available Low | In English | → Data |
| DAWG | Data Access Working Group | In English | → Organizations and associations → Data → Networks, communication |
| DB | Data Buffer | In English | → Data |
| DB | Data Bus | In English | → Data |
| DB | Data Base = BD | Banque de Données | In French |
In English | → Data |
| DBA | Data Base Administrator | In English | → Data → Knowledge management |
| DBC | Data Bus Coupler | In English | → Data |
| DBC | Data Bus Control | In English | → Data |
| DBC | Data Buffer Coupler | In English | → Data |
| DBCR | Data Base Change Request | In English | → Data |
| DBD | Database Driver | In English | → Software → Data |
| DBDD | Data Base Design Document | In English | → Data |
| DBE | Data Bus Element | In English | → Data |
| DBFN | Data Bus File Number | In English | → Data |
| DBG | Data Bus Group | In English | → Data |
| DBGMP | Data Bus Generation and Maintenance Package | In English | → Data |
| DBI | Data Base Interface | In English | → Human-computer interaction → Data |
| DBIA | Data Bus Interface Adapter | In English | → Data |
| DBIA | Data Bus Isolation Amplifier | In English | → Data |
| DBIU | Data Bus Interface Unit | In English | → Data |
| DBKS | Datu-baseak kudeatzeko sistema = DBMS | Data Base Management System | In English = SGBD | Système de Gestion de Base de Données | In French = SŘBD | Systém řízení báze dat | In Czech = SGBD | Sistema de Gestió de Bases de Dades | In Catalan = SMBD | Sistem manajemen basis data | In Indonesian = SUBP | Sustav za upravljanje bazom podataka | In Croatian = SGBD | Sistema de gestión de base de datos | In Spanish = DBMS | Datenbankmanagementsystem | In German |
In Basque | → Data |
| DBM | Data Base Management | In English | → Data |
| DBMS | Data Base Management Software | In English | → Software → Data |
| DBMS | Data Base Management System = DBKS, SGBD, SŘBD, SMBD, SUBP (look above) |
In English | → Data |
| DBMS | Datenbankmanagementsystem = DBKS, SGBD, SŘBD, SMBD, SUBP (look above) |
In German | → Data |
| DBN | Data Bus Network | In English | → Data → Networks, communication |
| DBRN | Data Bank Release Notice | In English | → Data |
| DBS | Data Base System | In English | → Data |
| DBS | Data Bus Simulator | In English | → Data |
| DBUR | Data Bank Update Request | In English | → Data |
| DBW | Data Bus Wire | In English | → Data |
| DC | Data Coordinator | In English | → Data |
| DC | Data Control | In English | → Data |
| DC | Dublin Core | In English | → Libraries → Data |
| DCARS | Data Collection And Reduction System | In English | → Data |
| DCAS | Data Collection and Analysis System | In English | → Data |
| DCB | Data Control Board | In English | → Data |
| DCC | Data Computation Complex | In English | |
| DCDS | Distributed Computing Design System | In English | |
| DCE | Data Circuit-terminating Equipment | In English | → Data → Telecommunications |
| DCEP | Data Collection and Evaluation Plan | In English | → Data |
| DCF | Data Control Facility | In English | → Data |
| DCIB | Data Communication Input Buffer | In English | → Data |
| DCIU | Digital Control and Interface Unit | In English | → Human-computer interaction |
| DCM | Display and Control Module | In English | → Human-computer interaction |
| DCM | Decommutator Control Memory | In English | → Memories |
| DCM | DECOM Control Memory | In English | → Memories |
| DCM | Data and Control Management | In English | → Data |
| DCM | Data and Configuration Management | In English | → Data |
| DCM | Dialogue Communication Multimédia (www.dcminteractive.com) | In French | → Graphic industries, printing, publishing |
| DCMES | Dublin Core Metadata Element Set | In English | → Libraries → Networks, communication |
| DCMI | Dublin Core Metadata Initiative | In English | → Libraries |
| DCN | Data Change Notice | In English | → Data |
| DCR | Data Change Request | In English | → Data |
| DCS | Data Communication System | In English | → Data |
| DCS | Data Conditioning System | In English | → Data |
| DCSU | Digital Computer Switching Unit | In English | |
| DCU | Digital Computer Unit | In English | |
| DD | Data Dictionary | In English | → Data → Dictionaries |
| DDA | Data Distribution Assembly | In English | → Data |
| DDDL | Digital Data Downlink | In English | → Data |
| DDDS | Digital Data Distribution System | In English | → Data |
| DDE | Dynamic Data Exchange | In French | → Data |
| DDEX | Digital Data Exchange | In English | → Data |
| DDI | Discrete Data Input | In English | → Data |
| DDL | Data Downlink | In English | → Data |
| DDL | Display Description Language | In English | → Human-computer interaction |
| DDL | Data Base Definition Language | In English | |
| DDM | Data Display Module | In English | → Human-computer interaction → Data |
| DDM | Discrete Data Management | In English | → Data |
| DDM | Distributed Data Manager | In English | → Data |
| DDN | Defense Data Network | In English | → Networks, communication → 355 |
| DDO | Discrete Data Output | In English | → Data |
| DDP | Data Distribution Panel | In English | → Data |
| DDP | Data Distribution Plan | In English | → Data |
| DDP | Digital Data Processing | In English | → Data |
| DDPC | Digital Data Processing Center | In English | → Data |
| DDPC | Digital Data Processing Complex | In English | → Data |
| DDPS | Digital Data Processing System | In English | → Data |
| DDR | Data Display and Review | In English | → Data |
| DDR | Data Display Room | In English | → Data |
| DDU | Data Display Unit | In English | → Human-computer interaction → Data |
| DEEIT | Division de l'Électricité, de l'Électromécanique, de l'Informatique et des Télécommunications | In French | → Electrical engineering → Electronics → 65 |
| DEI | Direction de l'Électronique et de l'Informatique | In French | → Electronics |
| DELMIA | Digital Enterprise Lean Manufacturing Interactive Application | In English | → Computer-based techniques → Engineering, technology |
| DELNI | Digital Ethernet Local Network Interconnect | In English | |
| DEOS | Data Enrollment Online Server | In English | → Networks, communication |
| DES | Data Encryption Standard | In English | → Computer-based techniques → Mathematics |
| DESI | Direction de l’Enseignement de Service en Informatique | In French | → Education |
| DEUA | Disabled Ebay Users Association | In English | → Associations → Internet → Trade |
| DFCS | Digital Flight Control Software | In English | → Software → Aeronautics, aircraft → 62989 |
| DFD | Data Flow Diagram | In English | → Data |
| DFE | Data Flow Engineer | In English | → Data |
| DFG | Display Format Generator | In English | → Human-computer interaction |
| DFKI | Deutsches Forschungszentrum für Künstliche Intelligenz | In German | → Artificial intelligence |
| DFS | Dynamic Flight Simulator | In English | → Computer simulation → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| DFSA | Digital Free Software Association | In English | → Associations → Software |
| DHCP | Dynamic Host Configuration Protocol | In English | → Networks, communication |
| DHS | Dead Hackers Society | In English | → Organizations and associations |
| DHT | Distributed Hash Table | In English | → Data |
| DHTML | Dynamic Hypertext Markup Language | In English | → Programming languages → Data |
| DIAL | Document Image Analysis for Libraries | In English | → Document processing |
| DICE | Digital Innovation through Cooperation in Europe | In English | → Engineering, technology |
| DICRÉAM | DIspositif pour la CRÉation Artistique Multimédia | In French | → Computer-based techniques → Arts |
| DID | Defense In Depth | In English | → 355 |
| DIELI | Direction des Industries Électroniques et de l'Informatique | In French | → Electronics |
| DIEU | Digital Interface Electronics Unit | In English | → Human-computer interaction → Electronics |
| DIIC | Departamento de Ingeniería de la Información y las Comunicaciones | In Spanish | → Telecommunications |
| DIM | Design Interface Meeting | In English | → Human-computer interaction |
| DIP | Data Integrated Plan | In English | → Data |
| DIP | Display Input Processor | In English | → Hardware → Human-computer interaction |
| DIP | Display Interface Processor | In English | → Hardware → Human-computer interaction |
| DIT | Data ID Table | In English | → Data |
| DIU | Digital Interface Unit | In English | → Human-computer interaction |
| DIU | Data Interface Unit | In English | → Human-computer interaction → Data |
| DiViBib | Digitale Virtuelle Bibliothek | In German | → Libraries → Networks, communication |
| DK | Display Keyboard | In English | → Human-computer interaction |
| DKE | Deutsche Kommission Elektrotechnik, Elektronik, Informationstechnik im DIN und VDE | In German | → Organizations and associations → Electrical engineering → Electronics |
| DLG | Directed Labelled Graph | In English | → Computer-based techniques |
| DLM | Document Lifecycle Management | In English | → Document processing → Knowledge management |
| DLSM | Data Link Summary Message | In English | → Data |
| DLTR | Data Link Transmission Repeater | In English | → Data |
| DLTR | Data Link Terminal Repeater | In English | → Data |
| DM | Data Management | In English | → Data |
| DMA | Direct Memory Access | In English | → Memories |
| DMA | Direct Memory Access | In German | → Memories |
| DMC | Data Management Computer | In English | → Knowledge management → Data |
| DMCM | Double-Density Modular Core Memory | In English | → Memories |
| DML | Data Manipulate Language | In English | → Programming languages → Data |
| DMP | DEU Message Processor | In English | → Hardware |
| DMP | Data Merger Processor | In English | → Data |
| DMP | Data Management Processor | In English | → Knowledge management → Data |
| DMS | Document Management System | In English | → Document processing → Knowledge management |
| DMS | Data Management System | In English | → Knowledge management → Data |
| DMSS | Data Management System Simulator | In English | → Data |
| DMTF | Desktop Management Task Force | In English | |
| DMU | Data Management Unit | In English | → Data |
| DMU | Digital Mock-Up | In English | → Computer-based techniques → Engineering, technology |
| DNS | Domain Name System | In English | → Networks, communication |
| DOLAP | Desktop On Line Analytical Processing | In English | → Knowledge management → Data |
| DOLCE | Descriptive Ontology for Linguistic and Cognitive Engineering | In English | |
| DOM | Document Object Model | In English | → Data → Document processing |
| DON | Disque Optique Numérique | In French | → Hardware |
| DOS | Disk Operating System | In English | → Operating systems |
| DOT | Data Output Tape | In English | → Data |
| DP | Data Product | In English | → Data |