| B | Byte | - | Business and Finance |
| B | Bit | - | Business and Finance |
| B SCALE | Synoptic Scale Ranging From 100 To 1 | - | Business and Finance |
| B&P | Budget And Planning Office | - | Business and Finance |
| BAA | Buy American Act | - | Business and Finance |
| BAC | Biosphere-Atmosphere Chemistry | - | Business and Finance |
| BAC | Budgeted Cost At Completion | - | Business and Finance |
| BAC | Boeing Airplane Company | - | Business and Finance |
| BACER | Biological & Climatological Effects Research | - | Business and Finance |
| BACH | Biosphere-atmosphere-chemistry | - | Business and Finance |
| BAE | British Aerospace | - | Business and Finance |
| BAFO | Best And Final Offer | - | Business and Finance |
| BAG | Boulder Aeronomy Group | - | Business and Finance |
| BAHC | Biospheric Aspects Of The Hydrological Cycle | - | Business and Finance |
| BAI | Biosphere-Atmosphere Interactions Project | - | Business and Finance |
| BAM | Berkeley Abstract Machine | - | Business and Finance |
| BAM | Brooklyn Arts Museum | - | Business and Finance |
| BAMEX | Bow Echo And Mesoscale Convective Vortex (MCV) Experiment | - | Business and Finance |
| BAMS | Bulletin Of The American Meteorological Society | - | Business and Finance |
| BANSHEE | Beam Accelerator For Novel Super High Energy Electron | - | Business and Finance |
| BAO | Boulder Atmospheric Observatory | - | Business and Finance |
| BAPMON | Baseline Air Pollution Monitoring Network | - | Business and Finance |
| BARC | Bhabha Atomic Research Centre | - | Business and Finance |
| BARRNET | Bay Area Regional Research Network | - | Business and Finance |
| BART | Biosphere Atmosphere Research And TRaining | - | Business and Finance |
| BART | Bay Area Rapid Transit | - | Business and Finance |
| BASC | Barrow Arctic Science Consortium | - | Business and Finance |
| BASC | Board On Atmospheric Sciences And Climate | - | Business and Finance |
| BASIC | Beginner's All-purpose Symbolic Instruction Code | - | Business and Finance |
| BASIS | Battelle Automated Search Information System | - | Business and Finance |
| BATCH MCIDAS | Routine That Runs Sequences Of McIDAS Commands From A Script | - | Business and Finance |
| BATGE | Biosphere-Atmosphere Trace Gas Exchange In The Tropics | - | Business and Finance |
| BATS | Biosphere-atmosphere Transfer Scheme | - | Business and Finance |
| BBC | British Broadcasting Corporation | - | Business and Finance |
| BBRR | Brookhaven Beam Research Reactor | - | Business and Finance |
| BBS | Bulletin Board System | - | Business and Finance |
| BBSO | Big Bear Solar Observatory | - | Business and Finance |
| BCAPS | Biological Component Of The Air Pollution Studies | - | Business and Finance |
| BCCB | Baseline Change Control Board | - | Business and Finance |
| BCD | Binary-coded Decimal | - | Business and Finance |
| BCD | Barcode Decal | - | Business and Finance |
| BCL | Battelle Columbus Laboratory | - | Business and Finance |
| BCS | Boeing Computer Services | - | Business and Finance |
| BCS | Bardeen-Cooper-Schrieffer | - | Business and Finance |
| BCWP | Budgeted Cost For Work Performed | - | Business and Finance |
| BCWS | Budgeted Cost For Work Scheduled | - | Business and Finance |
| BD | Blowdown | - | Business and Finance |
| BDL | Boundary Layer | - | Business and Finance |
| BDN | Bacteria-derived Nuclei | - | Business and Finance |
| BDSP | Basic Data Set Project | - | Business and Finance |
| BDU | Bus Data Unit | - | Business and Finance |
| BE | Best Estimate | - | Business and Finance |
| BEJ | Best Expert Judgment | - | Business and Finance |
| BEMC | Boulder Emergency Management Center | - | Business and Finance |
| BEP | Balloon Electronics Package | - | Business and Finance |
| BER | Bit Error Rate | - | Business and Finance |
| BER | Biological And Environmental Research | - | Business and Finance |
| BEST | Black Educational Science Trust | - | Business and Finance |
| BEST | Bilan D'energie Du Systeme Tropical | - | Business and Finance |
| BFPQ | Block Floating Point Quantizer | - | Business and Finance |
| BFS | Business And Financial Services | - | Business and Finance |
| BGCWG | Biogeochemistry Working Group | - | Business and Finance |
| BGE | Block Gaussian Elimination | - | Business and Finance |
| BGP4 | Border Gateway Protocol Version 4 | - | Business and Finance |
| BGS | Biogeosciences Initiative | - | Business and Finance |
| BHP | Brake Horsepower | - | Business and Finance |
| BI | The Brookings Institution | - | Business and Finance |
| BIATEX | Part Of EUROTRAC | - | Business and Finance |
| BIBEX | Biomass Burning Experiment | - | Business and Finance |
| BIGIT | A Binary Digit | - | Business and Finance |
| BINET | Bistatic Doppler Radar Receiver Network | - | Business and Finance |
| BIOFLUX | Bioaerosol Flux | - | Business and Finance |
| BIOMASS | Biological Investigations Of Marine Antarctic Systems And Stocks | - | Business and Finance |
| BIOME | Biological Imaging And Observational Mission To Earth | - | Business and Finance |
| BIORESP | Bio Response | - | Business and Finance |
| BIORESP | Bio Response | - | Business and Finance |
| BIP | Balloon-borne (instrument) Platform | - | Business and Finance |
| BIT | Binary Digit | - | Business and Finance |
| BIT | Binary Digit (either 0 Or 1) | - | Business and Finance |
| BIT | Built-in Test | - | Business and Finance |
| BITNET | Because It's Time Network | - | Business and Finance |
| BITS | Biologically Important Trace Species | - | Business and Finance |
| BL | Beta Lambda | - | Business and Finance |
| BLIP | Boundary Layer Instrument Package | - | Business and Finance |
| BLM | Bureau Of Land Management | - | Business and Finance |
| BLP | Boundary Layer Profiler | - | Business and Finance |
| BLPS | Boundary Layer Profiler System | - | Business and Finance |
| BLS | Bureau Of Labor Statistics | - | Business and Finance |
| BLSG | Boundary Layer Sensing Group | - | Business and Finance |
| BMDO | Ballistic Missile Defense Organization | - | Business and Finance |
| BMFT | Bundesminsterium Fur Forschung Und Technologie | - | Business and Finance |
| BMI | Battelle Memorial Institute | - | Business and Finance |
| BMO | Ballistic Missile Office | - | Business and Finance |
| BMRC | Bureau Of Meteorology Research Centre | - | Business and Finance |
| BMRR | Brookhaven Medical Research Reactor | - | Business and Finance |
| BNFL | British Nuclear Fuels Limited | - | Business and Finance |
| BNI | Bechtel National | - | Business and Finance |
| BNL | Brookhaven National Laboratory | - | Business and Finance |
| BNM | Bandelier National Monument | - | Business and Finance |
| BNSC | British National Space Centre | - | Business and Finance |
