| Abbreviation | Definition |
|---|---|
| BHSA | British Historical Society of America |
| BHSI | Bicycle Helmet Safety Institute |
| BHWHS | Black Hills Wild Horse Santuary |
| BI | Blessings International |
| BIA | Brain Injury Association |
| BIAA | Brain Injury Association of Alberta |
| BIAA | Brain Injury Association of America |
| BIAP | Bureau International d'Audiophonologie |
| BIAUSA | Brain Injury Association of the United States of America |
| BICN | Basic Income Canada Network |
| BIMS | Bloodbank Inventory Management System |
| BIMU | Black Intelligent Minds United |
| BIN | Brain Injury Network |
| BINA | Beta Israel of North America |
| BIRDS | Bharathi (means India) Integrated Rural Development Society |
| BIRE | Beacon Institute for Rivers and Estuaries |
| BIRT | Baking Industry Research Trust |
| BITNCF | Believe In Tomorrow National Children's Foundation |
| BJAA | Brighton Japanese American Association |
| BKCT | Barnsley Kilimanjaro Charity Trek |