| Acronym | Meaning |
 | ARLL | Advanced Run Length Limited |
| ARM | Advanced (Acorn) RISC Machine |
| ARM | Advanced RISC Machines Ltd |
| ARP | Address Resolution Protocol |
| ARPA | Advanced Research Projects Agency |
| ARQ | Automatic Repeat Request |
| ASAP | Activate Secure Authentication Protocol |
| ASAP | As Soon As Possible |
| ASCII | American Standard Code For Information Interchange |
| ASF | ActiveMovie Streaming Format |
| ASIC | Application-Specific Integrated Circuit |
| ASP | Active Server Pages |
| ASP | Application Service Provider |
| ASP | Association Of Shareware Professionals |
| AT | Attention |
| ATA | AT Attachment |
| ATL | Active (ActiveX) Template Library |
| ATM | Asynchronous Transfer Mode |
| AUI | Attachment Unit Interface |
| AVI | Audio/Video Interleaved Format |
| AWHFY | Are We Having Fun Yet |
| AWT | Abstract Windows Toolkit |
| B-ISDN | Broadband-Integrated Services Digital Network |
| B2B | Business-to-Business |
| BAPI | Business Application Programming Interface |
| BASIC | Beginners All-purpose Symbolic Instruction Code |
| BAT | Bandwidth Allocation Technology |
| BBS | Bulletin Board System |
| BCC | Blind Carbon Copy |
| BCC | Block Check Character |
| BCD | Binary Coded Decimal |
| BDP | Bandwidth-delay Product |
| BEDO RAM | Burst EDO RAM |
| BEOS | Be, Inc. Operating System |
| BG | Big Grin |
| BGA | Ball-grid Array |
| BGP | Border Gateway Protocol |
| BICMOS | Bipolar Complementary Metal Oxide Semiconductor |
| BIOS | Basic Input/Output System |
| BIT | Binary Digit |
| BITNET | Because Its Time Network |
| BLOB | Binary Large Object |
| BNC | Bayonet Neill Concelman |
| BOOTP | BOOTstrap Protocol |
| BPEL | Business Process Execution Language |
| BPL | Bits Per Line |
| BPP | Bits Per Pixel |
| BPS | Bits Per Second |
| BRI | Basic-Rate Interface |
| BSC | Base Station Controller |
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