| ASC | Apple Sound Chip | In English | → Computer-based techniques → Electronics |
| ASCI | Advanced School for Computing and Imaging | In English | → Specialized or (poly)technical colleges → Graphical processing → Image processing |
| ASCII | American Standard Code for Information Exchange | In English | → Data → Standardization |
| ASCII | American Standard Code for Information Interchange | In English | |
| ASCOT | Advanced Scientific Computing Team | In English | → Computer simulation → 5196 |
| ASDTIC | Analog-Signal-to-Discrete-Time-Interval Converter | In English | → Hardware |
| ASF | Advanced Streaming Format | In English | → Networks, communication → Telecommunications |
| ASF | Auto Sheet Feeder | In English | → Hardware |
| ASFP | askSam File Pointer | In English | → Software → Data |
| ASIP | AppleShare IP | In English | → Networks, communication → Telecommunications |
| ASJR | Association des Salles de Jeux en Réseau (www.asjr.net) | In French | → Associations → Software → Entertainment |
| ASN.1 | Abstract Syntax Notation One | In English | → Programming languages |
| ASP | AppleTalk Session Protocol | In English | → Networks, communication → Telecommunications |
| ASP | Active Server Pages | In English | → Software → Networks, communication |
| ASP | Application Service Provider | In English | → Software → Networks, communication |
| ASPI | Advanced SCSI Programming Interface | In English | → Software |
| ASR | Automated System Recovery | In English | |
| ASR | Automatic Speech Recognition = RAP | Reconnaissance Automatique de la Parole | In French |
In English | → Computer-based techniques → Linguistics |
| ASSESPRO | Associação das Empresas Brasileiras de Software e Serviços de Informática | In Portuguese | → Software → Associations |
| ASSP | Anti-Spam-SMTP-Proxy | In English | → Networks, communication → 6591 |
| ASWC | Asian Semantic Web Conference | In English | → Congresses → Networks, communication → Semiotics |
| AT | Access and Terminals | In English | → Human-computer interaction → Telecommunications |
| At2i | Automation Assistance Traçabilité Informatique Industrielle (www.at2i.net) | In French | → Mechanical engineering |
| AT2I | Assistance Téléphonie Informatique Internet sur Grenoble (www.groupe-at2i.com) | In French | → Internet → Telecommunications |
| ATA | Analogue Terminals & Access | In English | → Human-computer interaction |
| ATAG | Authoring Tool Accessibility Guidelines | In English | → Networks, communication |
| ATALA | Association pour le Traitement Automatique des LAngues (www.atala.org) | In French | → Associations → Computer-based techniques → Linguistics |
| ATAM | Architecture Tradeoff Analysis Method | In English | → Software → Architecture |
| ATC | Advanced Transfer Cache | In English | → Networks, communication → Telecommunications |
| ATC | ATE Computer | In English | |
| ATC | Aircraft Target Computer | In English | → Hardware → Aeronautics, aircraft |
| ATFG | Automatic Test File Generator | In English | → Software |
| ATHIS | Atelier International Histoire et Informatique | In French | → History |
| ATILLA | Association des Technologies Internet et du Logiciel Libre ou Alternatif | In French | → Associations → Software |
| ATIS | Automatic Terminal Information System | In English | |
| ATL | Active Template Library | In English | |
| ATLAP | AppleTalk Link Access Protocol | In English | → Computer-based techniques → Telecommunications |
| ATM | Adobe Type Manager | In English | |
| ATM | Asynchronous Transfer Mode | In English | |
| ATS | Automatic Transcribing System | In English | → Computer-based techniques |
| ATU-C | ADSL Transmission Unit at Central Office | In English | → Networks, communication → Telecommunications |
| ATU-R | ADSL Transmission Unit for Resident | In English | → Networks, communication → Telecommunications |
| ATu2L | Association Tunisienne des Logiciels Libres | In French | → Associations → Software |
| AU | Access Unit | In English | |
| AUFO | Association des Utilisateurs Français d'Oracle | In French | → Programming languages → Organizations and associations |
| AUI | Asociación Española de Usuarios de Internet | In Spanish | → Associations → Networks, communication |
| AURIF | Association des Utilisateurs de Réseaux Informatiques en Île-de-France | In French | → Networks, communication → Associations → Telecommunications |
| AURP | AppleTalk Update-Based Routing Protocol | In English | → Networks, communication → Telecommunications |
| AUTODIN | Automatic Digital Network | In English | |
| AUTOVON | Automatic Voice Network | In English | |
| AV | Audiovisual | In English | → Graphical processing → Image processing → Cinema, movies |
| AV | Access Violation | In English | → Networks, communication → Telecommunications |
| AVALON | Acquisition and Validation of Ontologies | In English | → Data |
| AVC | Advanced Video Coding | In English | → Computer-based techniques |
| AVI | Audio Video Interleaved | In English | → Computer-based techniques |
| AVM | ATM Voice Multiplexer | In English | → Computer-based techniques |
| AVS | Advanced Visual Systems | In English | → Software |
| AWT | Abstract Windowing Toolkit | In English | → Software |
| AXUL | Association aiXoise des utilisateurs de Linux et des logiciels libres | In French | → Associations → Software → Operating systems |
| BA | Behaviour Aggregate | In English | → Networks, communication → Telecommunications |
| BAIT | Bulgarian Association of Information Technologies | In English | → Associations → Telecommunications |
| BASE | Bielefeld Academic Search Engine | In English | → Software → Networks, communication |
| BASIC | Beginner's All-purpose Symbolic Instruction Code | In English | → Programming languages |
| BASS | Backup Avionics System Software | In English | → Software → Aeronautics, aircraft |
| BBS | Bulletin Board System | In English | → Networks, communication → Telecommunications |
| BC | Binary Counter | In English | |
| BC | Bus Coupler | In English | |
| BCB | Backbone Core Bridge | In English | → Networks, communication → Telecommunications |
| BCD | Binary-Coded Data | In English | |
| BCH | Binary-Coded Hexadecimal | In English | |
| BCI | Brain-Computer Interface | In English | → Human-computer interaction |
| BCM | Business Contact Manager | In English | → Software |
| BCS | Basic Content Services | In English | → Document processing → Knowledge management |
| BD | Banque de Données = DB | Data Base | In English |
In French | → Data |
| BDT | Block Data Transfer | In English | |
| BER | Bit Error Rate | In English | |
| BFC | Backup Flight Computer | In English | → Hardware → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| BFO | Basic Formal Ontology | In English | → Programming languages → Libraries |
| BFS | Backup Flight Software | In English | → Software → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| BFSS | Backup Flight Software System | In English | → Software → Aeronautics, aircraft → Spaceflight engineering, astronautics |
| BGP | Border Gateway Protocol | In English | → Internet |
| BIA | Bus Interface Adapter | In English | → Human-computer interaction |
| BiblioML | Bibliographic Markup Language | In English | → Libraries → Data |
| BIC | Bus Interface Controller | In English | → Human-computer interaction |
| BII | Bioinformatics Institute | In English | → Research institutes → Building |
| BIOS | Basic Input/Output System | In English | → Operating systems |
| BIT | Behaviour & Information Technology | In English | → Serial publications, periodicals → Psychology |
| BIU | Bus Interface Unit | In English | |
| BIU | Buffer Interface Unit | In English | |
| BLAS | Basic Linear Algebra Subprograms | In English | → Software → Algebra |
| BMAT | Barcelona Music and Audio Technologies | In English | → Computer-based techniques → Music |
| BMI | Brain Machine Interface | In English | → Human-computer interaction |
| BMI | Biomoleculaire Informatica | In Dutch | → Computer-based techniques → Biochemistry, biophysics → Biotechnology |
| BMIDE | Business Modeler Integrated Development Environment | In English | → Software |
| BMVA | British Machine Vision Association | In English | → Associations → Computer-based techniques |
| BNML | Business Narrative Markup Language | In English | → Programming languages → Economics |
| BOAI | Budapest Open Access Initiative | In English | → Networks, communication → Libraries |
| BOCC | Big Oxford Computer Company (www.bocc.co.uk) | In English | → Software → Networks, communication |
| BOI | Bałtycka Olimpiada Informatyczna | In Polish | |
| BOM | Byte-Order Mark | In English | |
| BPEL4WS | Business Process Execution Language for Web Services | In English | → Networks, communication → Economics |
| BPML | Business Process Management Language | In English | → Programming languages → Data |
| BPML | Business Process Markup Language | In English | → Programming languages → Economics |
| BPML | Business Process Modelling Language | In English | → Programming languages → Economics |
| BPQL | Business Process Query Language | In English | → Programming languages → Economics |
| BRMIC | Behavior Research Methods, Instruments and Computers | In English | → Serial publications, periodicals → Psychology |
| BRZ | Bundesrechenzentrum | In German | → Mathematics |
| BSA | Business Software Alliance | In English | → Organizations and associations → Software |
| BSCM | Business Service Configuration Manager | In English | → Hardware |
| BSCS | Bachelor of Science in Computer Science | In English | → Higher education, universities |
| BSD | Berkeley System Distribution | In English | → Operating systems |
| BSD | Berkeley Software Distribution | In English | → Operating systems |
| BSI | Bundesamt für Sicherheit in der Informationstechnik | In German | → Central administration |
| BSML | Bioinformatic Sequence Markup Language | In English | → Data → Biological sciences |
| BSS | Begusch Software Systeme | In German | → Software |
| BSW | BFS Software | In English | → Software |
| BTC | Binary Time Code | In English | |
| BTR | Bus Transfer | In English | |
| BTU | Bus Terminal Unit | In English | |
| BUC | Backup Computer | In English | → Hardware |
| BXML | Backbase eXtensible Mark-up Language | In English | → Programming languages |
| CAA | Computational Aeroacoustics | In English | → Computer-based techniques → Aerodynamics → Acoustics |
| CAA | Component Application Architecture | In English | → Software |
| CAALIS | Computer-Aided Assembly-Line Inspection System | In English | → Computer-based techniques |
| CAAML | Canadian Avalanche Association Markup Language | In English | → Software → Earth sciences |
| CAAT | Computer-Aided Assembly Tool | In English | → Computer-based techniques |
| CAB | Computer Address Bus | In English | |
| CAD | Computer-Aided Design | In English | → Computer-based techniques |
| CAD | Computer-Aided Detection | In English | → Diagnostics → Computer-based techniques |
| CADAM | Computer Graphics Augmented Design and Manufacturing | In English | → Computer simulation |
| CADAM | Computer Augmented Design And Manufacturing | In English | → Computer-based techniques → Engineering, technology |
| CADDS | Computer-Aided Design and Drafting System | In English | → Computer simulation |
| CADH | Communications and Data Handling | In English | → Data → Telecommunications |
| CADOPS | Computer-Aided Design costing for Operations | In English | → Computer-based techniques |
| CADS | Computer-Aided Design System | In English | → Computer-based techniques |
| CADU | Control And Display Unit | In English | → Human-computer interaction |
| CAE | Computer-Aided Engineering | In English | → Computer-based techniques → Engineering, technology |
| CAE | Computer Aided Engineering | In English | → Computer-based techniques → Engineering, technology |
| CAETI | Centre d’Alta Especialització en Tecnologies de la Informació | In Spanish | → Telecommunications |
| CAI | Computer-Aided Instruction | In English | → Computer-based techniques → Education |
| CAIT | Computer-Aided Instruction Trainer | In English | → Computer-based techniques → Education |
| CAIT | Computer-Aided Instruction Terminal | In English | → Computer-based techniques → Education |
| CAL | Computer-Aided Logistics | In English | → Computer-based techniques → 00393 |
| CALICO | Computer Assisted Language Instruction Consortium (www.calico.org) | In English | → Organizations and associations → Computer-based techniques → Education → Language, linguistics, literature |
| CALMIT | Center for Advanced Land Management Information Technologies | In French | → Agricultural sciences |
| CALS | Computer-Aided Acquisition and Logistics Support | In English | → Computer-based techniques → Maintenance and logistics |
| CAM | Carte à Mémoire | In French | → Memories |
| CAM | Computer-Aided Manufacturing | In English | → Computer-based techniques |
| CAM | Content-Addressable Memory | In English | → Memories |
| CAMEL | Customized Applications for Mobile networks Enhanced Logic | In English | → Networks, communication → Telecommunications |
| CAMP | Computer-Aided Message Processing | In English | → Software |
| CANIS | Community Architectures for Network Information Systems | In English | → Networks, communication |
| CAO | Conception Assistée par Ordinateur | In French | → Computer-based techniques → Engineering, technology |
| CAP | Computer Application Program | In English | → Software |
| CAPP | Computer-Aided Process Planning | In English | → Management → Computer-based techniques |
| CAPS | Compilation, Architectures Parallèles et Systèmes | In French | → Research institutes |
| CAPTCHA | Completely Automated Public Turing Test to Tell Computers and Humans Apart | In English | → Artificial intelligence |
| CARETAKER | Content Analysis and REtrieval Technologies to Apply Knowledge Extraction to massive Recording | In English | → Computer-based techniques → Knowledge management |
| CAS | Common Access System | In English | |
| CAS | Content Addressed Storage | In English | → Hardware → Knowledge management |
| CASE | Computer Aided Software Engineering | In English | → Software → Computer-based techniques |
| CASE | Computer-Aided System Engineering | In English | → Computer-based techniques → Engineering, technology |
| CASE | Computer-Automated Software Engineering | In English | → Software |
| CASOS | Computational Analysis of Social and Organizational Systems | In English | → Social sciences |
| CATIA | Conception Assistée Tri-dimensionnelle InterActive | In French | → Computer-based techniques → Engineering, technology |
| CAUCE | Coalition Against Unsolicited Commercial Email | In English | → Organizations and associations → Networks, communication → Telecommunications |
| CBEMA | Computer and Business Equipment Manufacturers Association | In English | → Associations → Hardware |
| CBM | Commodore Business Machines | In English | → Hardware |
| CBR | Computers and Biomedical Research | In English | → Serial publications, periodicals → Biological sciences → Medicine |
| CCbdx | Collectif des Câblés de Bordeaux | In French | → Networks, communication → Organizations and associations |
| CCC | Computer Checkout Console | In English | → Hardware |
| CCC | Central Computer Complex | In English | |
| CCC | Coordinate Conversion Computer | In English | → Hardware |
| CCCPA | Chicago Chinese Computing Professional Association | In English | → Associations |
| CCD | Central Command Decoder | In English | |
| CCE | Computer Command Engineer | In English | |
| CCF | Central Computer Facility | In English | |
| CCIM | Command Computer Input Multiplexer | In English | |
| CCITT | Certification for IT&T | In English | → Networks, communication → Telecommunications |
| CCM | Comment Ça Marche (www.commentcamarche.net) | In French | → Networks, communication |
| CCP | Computer Control Panel | In English | |
| CCS | Computer Core Segment | In English | → Hardware |
| CCS | Central Computer and Sequencer | In English | |
| CCT | Computer-Compatible Tape | In English | |
| ccTLD | Country code Top Level Domain | In English | → Networks, communication → Telecommunications |
| CCW | Computer Center Werner | In English | |
| CDB | Computer Data Bus | In English | → Hardware → Data |
| CDB | Command Data Base | In English | → Data |
| CDB | Central Data Buffer | In English | → Data |
| CDBFR | Common Data Buffer | In English | → Data |
| CDC | Command and Data Handling Console | In English | |
| CDC | Computer Development Center | In English | → Research institutes |
| CDC | Control Data Corporation | In English | |
| CDC | Connected Device Configuration | In English | |
| CDD | Common Data Dictionary | In English | → Data |
| CDE | Collaborative Development Environment | In English | → Software |
| CDF | Central Data Facility | In English | → Data |
| CDF | Combined Data File | In English | → Data |
| CDF | Compound Document Format | In English | → Data |
| CDLC | Connected Limited Device Configuration | In English | → Software |