| Acronym | Meaning |
| AWG | American Wire Gage |
| AWGWC | Air Force Global Weather Center |
| AWIPS | Advanced Weather Interactive Processing System |
| AWIPS-90 | Advanced Weather Interactive Processing System For The 90's |
| AWISE | Association Of Women In Science And Engineering |
| AWN | Aviation Weather Network |
| AWOS | Automated Weather Observing System |
| AWP | Aviation Weather Program |
| AWPG | Aviation Weather Products Generator |
| AWQC | Ambient Water Quality Criteria |
| AWRDF | Advanced Weapons Radiochemical Diagnostics Facility |
| AWRE | Atomic Weapon Research Establishment |
| AWS | Aviation Weather Service |
| AWS | Air Weather Service |
| AWSE | Australian Winter Storm Experiment |
| AWSMSC | Air Weather Service Master Station Catalog |
| AWU | Associated Western Universities |
| AWU | Atomic Weight Unit |
| AWWA | American Waterworks Association |
| AX | Auxiliary Systems |
| AXAF | Advanced X-ray Astrophysics Facility |
| AXBT | Air-Deployed Expendable Bathythermographs |
| AXBT | Expendable Bathythermographs Air Dropped Temperature Device |
| AXCP | Airborne Expendable Current Profiler |
| AY | Sandia National Laboratory |
| B | Bit |
| B | Byte |
| B SCALE | Synoptic Scale Ranging From 100 To 1 |
| B&P | Budget And Planning Office |
| BAA | Buy American Act |
| BAC | Biosphere-Atmosphere Chemistry |
| BAC | Budgeted Cost At Completion |
| BAC | Boeing Airplane Company |
| BACER | Biological & Climatological Effects Research |
| BACH | Biosphere-atmosphere-chemistry |
| BAE | British Aerospace |
| BAFO | Best And Final Offer |
| BAG | Boulder Aeronomy Group |
| BAHC | Biospheric Aspects Of The Hydrological Cycle |
| BAI | Biosphere-Atmosphere Interactions Project |
| BAM | Berkeley Abstract Machine |
| BAM | Brooklyn Arts Museum |
| BAMEX | Bow Echo And Mesoscale Convective Vortex (MCV) Experiment |
| BAMS | Bulletin Of The American Meteorological Society |
| BANSHEE | Beam Accelerator For Novel Super High Energy Electron |
| BAO | Boulder Atmospheric Observatory |
| BAPMON | Baseline Air Pollution Monitoring Network |
| BARC | Bhabha Atomic Research Centre |
| BARRNET | Bay Area Regional Research Network |
| BART | Biosphere Atmosphere Research And TRaining |