| BAK | Binary Adaptation Kit |
| BAL | Basic Assembly Language |
| BALUN | Balanced Unbalanced |
| BAM | Boyan Action Module |
| BARTS | Bell Atlantic Regional Timesharing |
| BASH | Bourne Again Shell |
| BASIC | Beginner’s All-purpose Symbolic Instruction Code |
| BASM | Built-In Assembler |
| BAT | Block Address Translation |
| BBS | Bulletin Board System |
| BCC | Block Check Character |
| BCD | Binary Coded Decimal |
| BCL | Batch Command Language |
| BCN | Beacon |
| BCP | Best Current Practice or Bulk Copy Program |
| BCPL | Basic Computer Programming Language |
| BCR | Byte Count Register |
| BCS | Bar Code Sorter |
| BDA | Bios Data Area |
| BDE | Borland Database Engine |
| BDOS | Basic Disk Operating System |
| BDR | Bus Device Request |
| BE | Below or Equal |
| BEL | Bell |
| BELLCORE | Bell Communications Research |
| BERT | Bit Error Rate Test/Tester |
| BF | Bad Flag |
| B/F | Background/Foreground |
| BFF | Binary File Format |
| BFT | Binary File Transfer |
| BGA | Ball Grid Array |
| BGCOLOR | Background Color |
| BGE | Branch if Greater or Equal |
| .BGI | Borland Graphic Interface |
| BGP | Border Gateway Protocol |
| BGT | Branch if Greater Than |
| BHI | Branch if Higher |
| BHIS | Branch if Higher or Same |
| BI | Binary Input |
| .BIB | Bibliography |
| BIM | Beginning of Information Marker |
| .BIN | Binary |
| BINAC | Binary Automatic Computer |
| BIOS | Basic Input/ Output System |
| BIS | Business Information System |
| BISDN | Broadband Integrated Services Digital Network |
| BIST | Built-In Self-Test |
| BIT | Binary Digit |
| BITNET | Because It’s Time Network |
| BITNIC | Bitnet Network Information Center |
| BIU | Bus Interface Unit |
| BIX | Byte Information Exchange |
| BIZ. | Business |
| .BK! | Backup |
| .B~K | Backup |
| BKSP | Backspace |
| BL | Backlit |
| BLAST | Blocked Asynchronous Transmission |
| BLE | Branch if Less or Equal |
| BLER | Block Error |
| BLK | Block |
| BLOB | Binary Large Object |
| BLOS | Branch if Lower Or Same |
| BMI | Branch if Minus |
| BMIC | Bus Master Interface Controller |
| BMP | Basic Mapping Support or Batch Message Processing Program |
| BNE | Branch if Not Equal |
| BNS | Backbone Network Service |
| BO | Binary Output |
| BoB | Break-out Box |
| BOC | Basic Operator Console |
| BOM | Beginning Of Message |
| BOOTP | Bootstrap Protocol |
| BOPS | Billion Operations Per Second |
| BORPQU | Borland Pro Quattro |
| BORQU | Borland Quattro |
| BOS | Basic Operating System |
| BOT | Beginning of Table or Beginning of Tape |
| BP | Base Pointer |
| BPB | BIOS Parameter Block |
| BPI | Bits per Inch |
| BPL | Branch if Plus |
| BPS | Bits per Second or Bytes per Second |
| BR | Bad Register |
| BRGC | Binary Reflected Gray Code |
| BRI | Basic Rate Interface or Brain Response Interface |
| BS | Backspace |
| BSAM | Basic Sequential Access Method |
| BSC | Binary Synchronous Communication |
| BSCS | Bachelor of Science in Computer Science |
| BSD | Berkely Software/Standard Distribution |
| BSF | Bit Scan Forward |
| BSI | British Standards Institute |
| BSR | Bit Scan Reverse |
| BSS | Block Started by Symbol |
| BSY | Busy |
| BSYNC | Binary Synchronous Communications |
| BT | Bit Test |
| BTAM | Basic Telecommunications Access Method |
| BTB | Branch Target Buffer |
| BTC | Bit Test and Complement |
| BTOA | Binary To ASCII |
| BTP | Batch Transfer Program |
| BTR | Bit Test and Reset |
| BTS | Bit Test and Set |
| BU | Branch Unit |
| BUBL | Bulletin Board for Libraries |
| BUF | Buffer |
| BVH | Base Video Handler |
| BWM | Block-Write Mode |
| B2X | Binary To Hexadecimal |
| BYTE | Binary Element String |
