| Black Alumni Association | Academic & Science |
| British Academy of Audiology | Academic & Science |
| British Archaeological Association | Academic & Science |
| Boston Arts Academy | Academic & Science |
| Bialla | Airport Code |
| Business Administration And Accountancy | Business |
| Banro Corporation | Business |
| Broad Agency Announcements | Business |
| Business Associate Agreement | Business |
| Bragg Amino Acids | Chemistry |
| Bay Area Action | Community |
| Batman: Arkham Asylum | Community |
| Birmingham Anglers Association | Community |
| British Astronomical Association | Community |
| Brand Activation Association | Community |
| British Awarding Association | Community |
| Brick Appreciation Association | Community |
| Board on Agriculture Assembly | Computing |
| Blanket Authorization Agreement | Computing |
| Bleedin Amazin Arithmetic | General |
| Business Achievement Awards | General |
| British Animation Awards | General |
| Bulletin to Available Agents | General |
| Be An Athlete | General |
| Board of Assessment Appeals | General |
| Broad Area Announcement | General |
| Berjaya Auto Alliance | General |
| Blogger Auto Award | General |
| Bosch Automotive Aftermarket | General |
| Bosch Abs Actuator | General |
| Bridge Automotive Academy | General |
| British Aviation Authority | General |
| Bad Attitude Airport | Governmental |
| British Airports Authority | Governmental |
| Bureau of Assessment and Accountability | Governmental |
| Blue Atmosphere Army | Governmental |
| BARALA | Indian Railway Station |
| Big A** Anteaters | Internet |
| Best Affine Approximation | Maths |
| British Agrochemicals Association | Medical |
| Breed Age Average | Medical |
| Broad Agency Announcement | Military and Defence |
| Battlefield Automation Appraisal | Military and Defence |
| Bialla, Papua New Guinea | Regional |
| Bloomington Athletic Association | Sports |
| Boston Athletic Association | Sports |
| Basketball Association of America | Sports |
