| Abbreviation | Definition |
|---|---|
| ACS | Asynchronous Connection Server |
| ACS | Australian Computer Society |
| ACS | Automatic Class Selection |
| ACSE | Application Control Service Element |
| ACT | Advanced Composite Technology |
| ACTA | Administrative Council for Terminal Attachment |
| ACTS | Automated Computer Time Service |
| ACU | Automatic Calling Unit |
| AD | Analog to Digital |
| ADA | Analog Digital Analog |
| Ada | Language after Augusta Ada Byron, computer pioneer |
| ADAM | Affordable Desktop Application Manager |
| ADAR | Ada Decimal Arithmetic And Representations |
| ADAS | Automated Disk Analysis System |
| ADAT | Alesis Digital Audio Tape |
| ADC | Active Directory Connector |
| ADC | Advanced Disk Catalog |
| ADC | Apple Developer Connection |
| ADC | Apple Display Connector |
| ADC | Automated Data Capture |