| Abbreviation | Definition |
|---|---|
| BCMU | Bengal Chatkal Mazdoor Union |
| BCNU | B C Nurses Union |
| BCNU | British Columbia Nurses Union |
| BCNU | British Columbia Nurses' Union |
| BCRU | British Columbia Rugby Union |
| BCSU | Blackburn College Students' Union |
| BCWU | Botswana Construction Workers' Union |
| BDK | Black Disciple Killers |
| BECTU | Broadcasting, Entertainment, Cinematograph and Theatre Union |
| BECU | Boeing Employee Credit Union |
| BECU | Boeing Employees Credit Union |
| BECU | Brethren Employees Credit Union |
| BESU | Bachelor of Environment Student Union |
| BEU | Black Economic Union |
| BEU | Brookline Educators Union |
| BEUC | Bureau Européen des Unions de Consommateurs |
| BEWU | Bahamas Electrical Workers Union |
| BEWU | Belize Electricity Workers Union |
| BEWU | Belize Energy Workers Union |
| BFAWU | Bakers, Food and Allied Workers' Union |