| Abbreviation | Definition |
|---|---|
| BCS | Basic Combined Subset |
| BCS | Boston Computer Society |
| BCS | British Computer Society |
| BCS | Business Computer System |
| BCT | By Copy To |
| BD | Back Door |
| BD | Bad Disk |
| BD | Big Digits |
| BDAM | Basic Direct Access Method |
| BDD | Binary Dialog Definition |
| BDF | Bitmap Distribution Format |
| BDI | Brain Dead Install |
| BDI | Business Data Integration |
| BDR | Basic Density Range |
| BDU | Brain Dead User |
| BEAM | Board Electronically Accessible Mail |
| BEAR | Business Enterprise Automation and Replication |
| BEAST | Beginner's Eccentric Algorithmic Symbolic Tool |
| BEL | Bell |
| BEO | Block Enable Out |