| Abbreviation | Definition |
|---|---|
| BL | Bible League |
| BLAF | Boris Lurie Art Foundation |
| BLAH | Bringing Life And Hope |
| BLAH | British Lovable Association of Houses |
| BLC | Birchwood Learning Center |
| BLCN | Ban Landmines Campaign Nepal |
| BLEC | Berkshire Litchfield Environmental Council |
| BLT | Brave Little Talkers Toastmasters Club |
| BMF | Business Men's Fellowship USA |
| BMO | Business Membership Organization |
| BMOA | Black Men Of America |
| BMWA | Basingstoke Muslim Welfare Association |
| BMWA | Brazoria Men and Women of Action |
| BNC | Baltimore Neighborhood Collaborative |
| BNCU | Bahamas National Consumers Union |
| BNDP | Bridgespan Nonprofit Development Program |
| BNF | British Nutrition Foundation |
| BNNRC | Bangladesh NGOs Network for Radio and Communication |
| BNPCF | Bear Necessities Pediatric Cancer Foundation |
| BNPCFI | Bear Necessities Pediatric Cancer Foundation, Inc. |