| B | Bit | - | Organizations |
| B&P | Budgetary And Planning | - | Organizations |
| B&W | Black And White | - | Organizations |
| B-1 | DIV B-1 Division (Rockwell) | - | Organizations |
| B/A | Bank Angle | - | Organizations |
| B/A | Barometric Altimeter | - | Organizations |
| B/A | Buffer Amplifier | - | Organizations |
| B/C | Bench Check | - | Organizations |
| B/L | Baseline | - | Organizations |
| B/O | Booster Orbiter | - | Organizations |
| B/O | Breakout | - | Organizations |
| B/O | Burnout | - | Organizations |
| B/SC | Brake Skid Control | - | Organizations |
| B/SEC | Bits Per Second | - | Organizations |
| B/SMPL | Bits Per Sample | - | Organizations |
| B/U | Backup | - | Organizations |
| B/V | Bleed Valve | - | Organizations |
| B/W | Black And White | - | Organizations |
| BA | Bank Angle | - | Organizations |
| BA | Breathing Air | - | Organizations |
| BAC | Boeing Aircraft Company | - | Organizations |
| BAC | Booster Assembly Contractor | - | Organizations |
| BAC | Buffer Access Card | - | Organizations |
| BACS | Body Axis Coordinate System | - | Organizations |
| BAI | Barometric Altitude Indicator | - | Organizations |
| BAIR | Breathing Air | - | Organizations |
| BAL | Balance | - | Organizations |
| BAN | Budget Allocation Notice | - | Organizations |
| BARB | Ballast Aerating Retrieval Boom | - | Organizations |
| BARO | Barometer | - | Organizations |
| BARS | Baseline Accounting And Reporting System | - | Organizations |
| BASD | Ball Aerospace Systems Division | - | Organizations |
| BASS | Backup Avionics System Software | - | Organizations |
| BATT | Battery | - | Organizations |
| BB | Breadboard | - | Organizations |
| BBC | Before Business Clearance | - | Organizations |
| BC | Battery Charger | - | Organizations |
| BC | BinaryCounter | - | Organizations |
| BC | Bus Coupler | - | Organizations |
| BCCT | Break Control Command Transducers | - | Organizations |
| BCD | Binary Coded Decimal | - | Organizations |
| BCE | Backup Control Electronics | - | Organizations |
| BCE | Bus Control Element | - | Organizations |
| BCFS | Backup Flight Control System | - | Organizations |
| BCH | Binary Coded Hexadecimal | - | Organizations |
| BCH | Bose-Chaudhuri-Hocquenghen (Computer Code) | - | Organizations |
| BCN | Beacon | - | Organizations |
| BCP | Base Condemnation Percent | - | Organizations |
| BCP | Benchmark Control Point | - | Organizations |
| BCR | Bar Chart Report | - | Organizations |
| BCRD | Basic Consolidated Requirements Document | - | Organizations |
| BCRT | Binary Code Range Time | - | Organizations |
| BCT | Bus Configuration Table | - | Organizations |
| BCU | Bus Control Unit | - | Organizations |
| BCWP | Budget Costs For Work Performed | - | Organizations |
| BCWS | Budget Costs For Work Scheduled | - | Organizations |
| BD | Band | - | Organizations |
| BD | BinaryDecoder | - | Organizations |
| BD | Binary Discrete | - | Organizations |
| BD | Binary Digit | - | Organizations |
| BD | Board | - | Organizations |
| BDA | Backup Drive Amplifier | - | Organizations |
| BDA | Backup Drive Amplifier | - | Organizations |
| BDA | BermudaIsland | - | Organizations |
| BDA | Bermuda (STDN) | - | Organizations |
| BDA | Blast Danger Area | - | Organizations |
| BDC | Bi-Directional Converter | - | Organizations |
| BDC | Bit Error Rate | - | Organizations |
| BDCF | Baseline Data Collection Facility | - | Organizations |
| BDCR | Baseline Document Change Request | - | Organizations |
| BDD | Baseline Definition Document | - | Organizations |
| BDT | Block Data Transfer | - | Organizations |
| BDY | Body | - | Organizations |
| BDYFLP | Body Flap | - | Organizations |
| BECO | Booster Engine Cutoff | - | Organizations |
| BER | Bit Error Rate | - | Organizations |
| BFC | Backup Flight Control | - | Organizations |
| BFCS | Backup Flight Control System | - | Organizations |
| BFS | Backup Flight System | - | Organizations |
| BITE | Built-in Test Equipment | - | Organizations |
| BLK | Block | - | Organizations |
| BLOW | Booster-Lift-Off Weight | - | Organizations |
| BLR | Boiler | - | Organizations |
| BLS | Bottom Left Side | - | Organizations |
| BLV | Bleed Valve | - | Organizations |
| BLWR | Blower | - | Organizations |
| BM | Basal Metabolism | - | Organizations |
| BM | Body Mounted | - | Organizations |
| BM | Business (Branch) Manager | - | Organizations |
| BMA | Body-Mounted Accelerometer | - | Organizations |
| BMAG | Body-Mounted Attitude Gyro | - | Organizations |
| BMAP | Buffer Map | - | Organizations |
| BMB | Base Maintenance Building | - | Organizations |
| BME | Bench Maintenance Equipment | - | Organizations |
| BMFT | German D-1 Spacelab Payload | - | Organizations |
| BMMD | Body Mass Measuring Device | - | Organizations |
| BMS | Background Measurement Satellite | - | Organizations |
| BMU | Bus Monitor Unit | - | Organizations |
| BN | Ballistic Number | - | Organizations |
| BO | Breakout Box | - | Organizations |
