| Abbreviation | Definition |
|---|---|
| BLAM | Bryological / Lichenological Working Group for Middle Europe |
| BLAM | Bryologisch-Lichenologische Arbeitsgemeinschaft fr Mitteleuropa |
| BLAM | Bryologisch-Lichenologische Arbeitsgemeinschaft für Mitteleuropa |
| BLCS | British Limousin Cattle Society |
| BLCS | British Liquid Crystal Society |
| BLCS | Brock Leaders Citizenship Society |
| BLESS | Big Lake Environment Support Society |
| BLMS | Bulletin London Mathematical Society |
| BLMS | Bulletin of the London Mathematical Society |
| BLOODS | Bitter Lads Objectifying Oppressive Dysfunctional Society |
| BLOS | British Lingual Orthodontic Society |
| BLPS | Bahamas Lighthouse Preservation Society |
| BLS | Berkeley Linguistics Society |
| BLWG | Bryologische en Lichenologische Werkgroep |
| BLWG | Dutch Bryological and Lichenological Society |
| BMAS | Boothe Memorial Astronomical Society |
| BMAS | British Medical Acupuncture Society |
| BMCS | Bristol Muslim Cultural Society |
| BMCWS | Bombay Mothers and Children Welfare Society |
| BMCWS | Bombay Mothers Children Welfare Society |