| B | Bel - Boron | - | Astronomy |
| B&W | Babcock & Wilcox - Black And White - Bowers & Wilkins | - | Astronomy |
| B/F | Before | - | Astronomy |
| B10 | Ben 10 | - | Astronomy |
| B2B | Business-to-business Electronic Commerce | - | Astronomy |
| B2C | Business-to-consumer Electronic Commerce | - | Astronomy |
| B2E | Business-to-employee Electronic Commerce | - | Astronomy |
| B?C | Blue ?yster Cult | - | Astronomy |
| BA | Bachelor Of Arts -Bahrain (FIPS 10-4 Country Code) - Bosnia And Herzegovina (ISO 3166 Digram) -British Airways - British Army | - | Astronomy |
| BA | Barium | - | Astronomy |
| BA | Bashkir Language (ISO 639-1 Code) | - | Astronomy |
| BAA | British Airport Authority | - | Astronomy |
| BAC | Bohica Associates Corporation | - | Astronomy |
| BADD | Battlefield Awareness And Data Dissemination | - | Astronomy |
| BAE | BAE Systems (formerly British Aerospace | - | Astronomy |
| BAFTA | British Academy Of Film And Television Arts | - | Astronomy |
| BAI | Battlefield Air Interdiction | - | Astronomy |
| BAK | Bashkir Language (ISO 639-2 Code) | - | Astronomy |
| BALCO | Bay Area Laboratory Co-operative | - | Astronomy |
| BAM | Business Activity Monitoring -Bosnia And Herzegovina Convertible Mark (ISO 4217 Currency Code) | - | Astronomy |
| BAM | Bambara Language (ISO 639-2 Code) | - | Astronomy |
| BAMC | Brooke Army Medical Center | - | Astronomy |
| BANESTO | Banco Espa?ol De Cr?dito (Spanish | - | Astronomy |
| BAO | Battlefield Air Operations | - | Astronomy |
| BAOR | British Army Of The Rhine | - | Astronomy |
| BAR | British American Racing - Browning Automatic Rifle - Buy-American Restrictions | - | Astronomy |
| BARD | Binational Agricultural Research And Development Fund (between The US And Israel) | - | Astronomy |
| BARDA | Biomedical Advanced Research & Development Agency | - | Astronomy |
| BART | Bay Area Rapid Transit | - | Astronomy |
| BAS | Battalion Aid Station | - | Astronomy |
| BASE | Building | - | Astronomy |
| BASF | Badische Anilin Und Soda Fabrik (German Chemicals Company) | - | Astronomy |
| BASIC | Beginner's All-purpose Symbolic Instruction Code (acronym Was Added Later | - | Astronomy |
| BAT | Basic Aid Training | - | Astronomy |
| BATBYGOBSTOPL | Buying A Ticket Before You Get On Board Saves Time Or Problems Later | - | Astronomy |
| BATF | U.S. Bureau Of Alcohol | - | Astronomy |
| BATS | Behavior Analysis Training System - Bradley Advanced Training System | - | Astronomy |
| BATTERS | Bisei Asteroid Tracking Telescope For Rapid Survey | - | Astronomy |
| BB | Barbados (ISO 3166 Digram; FIPS 10-4 Country Code) -Boys' Brigade (Christian Youth Organisation) - Brigitte Bardot (actress) | - | Astronomy |
| BBB | Better Business Bureau - Blood-Brain Barrier | - | Astronomy |
| BBC | Big Black Cock | - | Astronomy |
| BBC | Breeding Bird Census - British Broadcasting Corporation | - | Astronomy |
| BBD | Barbados Dollar (ISO 4217 Currency Code) | - | Astronomy |
| BBL | Be Back Later - Bird Banding Laboratory - British Basketball League | - | Astronomy |
| BBN | Bolt | - | Astronomy |
| BBQ | Barbecue[1] | - | Astronomy |
| BBS | Breeding Bird Survey (North America) - Brigade/Battalion Battle Simulation - Bulletin Board System | - | Astronomy |
| BBSRC | U.K. Biotechnology And Biological Sciences Research Council | - | Astronomy |
| BC | Before Christ - Blind Copy (in Emailers) - Boston College -Botswana (FIPS 10-4 Country Code; From Bechuanaland) - British Columbia (postal Symbol) | - | Astronomy |
| BCC | Blind Carbon Copy | - | Astronomy |
| BCCI | Board Of Control For Cricket In India - Bank Of Credit And Commerce International | - | Astronomy |
| BCD | Binary-Coded Decimal | - | Astronomy |
| BCE | Banque Centrale Europ?enne - Battlefield Co-ordination Element - Before Common Era - British Columbia Electric Railway | - | Astronomy |
| BCER | British Columbia Electric Railway | - | Astronomy |
| BCFG | Patchy Fog (METAR Code) | - | Astronomy |
| BCIS | Battlefield Combat Identification System | - | Astronomy |
| BCPL | Basic Combined Programming Language (progenitor Of C) | - | Astronomy |
| BCS | Bardeen | - | Astronomy |
| BCT | Brigade Combat Team | - | Astronomy |
| BD | Bangladesh (ISO 3166 Digram) - Bermuda (FIPS 10-4 Territory Code) | - | Astronomy |
| BDA | British Dental Association | - | Astronomy |
| BDD | Body Dysmorphic Disorder - British Defence Doctrine | - | Astronomy |
| BDE | Brigade | - | Astronomy |
| BDFL | Benevolent Dictator For Life | - | Astronomy |
| BDI | Burundi (ISO 3166 Trigram) | - | Astronomy |
| BDNF | Brain-Derived Neurotrophic Factor | - | Astronomy |
| BDO | Battle Dress Overgarment | - | Astronomy |
| BDOS | Basic Disk Operating System; Part Of CP/M | - | Astronomy |
| BDS | #NAME? | - | Astronomy |
| BDSM | Bondage And Discipline | - | Astronomy |
| BDT | Bangladeshi Taka (ISO 4217 Currency Code) -Bureau De D?veloppement Des T?l?communications (Telecommunication Development Bureau | - | Astronomy |
| BDTA | British Dental Trade Association | - | Astronomy |
| BDU | Battle-Dress Uniform | - | Astronomy |
| BE | Belarusian Language (ISO 639-1 Code) | - | Astronomy |
| BE | Belgium (FIPS 10-4 Country Code; ISO 3166 Digram) | - | Astronomy |
| BE | Beryllium | - | Astronomy |
| BEA | Banque Ext?rieure D'Alg?rie - British European Airways (ancestor Of British Airways) | - | Astronomy |
| BEL | Belarusian Language (ISO 639-2 Code) | - | Astronomy |
| BEL | Belgium (ISO 3166 Trigram) | - | Astronomy |
| BEM | British Empire Medal - Bug-Eyed Monster | - | Astronomy |
| BEN | Bengali Language (ISO 639-2 Code) | - | Astronomy |
| BEN | Benin (ISO 3166 Trigram) | - | Astronomy |
| BEO | Banquet Event Order | - | Astronomy |
| BER | Bit Error Rate | - | Astronomy |
| BES | Budget Estimate Submission | - | Astronomy |
| BESS | Business | - | Astronomy |
| BETS | Bradley Embedded Training System | - | Astronomy |
| BF | The Bahamas (FIPS 10-4 Country Code) - Burkina Faso (ISO 3166 Digram) | - | Astronomy |
| BFA | Burkina Faso (ISO 3166 Trigram) | - | Astronomy |
| BFF | Best Friends Forever | - | Astronomy |
| BFR | Brominated Flame Retardant | - | Astronomy |
| BFSA | Blue Force Situation Awareness | - | Astronomy |
| BG | Bangladesh (FIPS 10-4 Country Code) -Battle Group - Body Guard -Brigadier General -Bulgaria (ISO 3166 Digram) | - | Astronomy |
| BG | Bulgarian Language (ISO 639-1 Code) | - | Astronomy |
| BGA | Ball Grid Array - Brandy And Ginger Ale (alcoholic Beverage) | - | Astronomy |
| BGD | Bangladesh (ISO 3166 Trigram) | - | Astronomy |
| BGN | U.S. Board On Geographic Names -Bulgarian Lev (ISO 4217 Currency Code) | - | Astronomy |
| BGR | Bulgaria (ISO 3166 Trigram) | - | Astronomy |
| BGS | Bristol Grammar School - British Geographical Survey | - | Astronomy |
| BGWG | Battle Group Wargame (military Simulation; Big Wig) | - | Astronomy |
