| Abbreviation | Definition |
|---|---|
| BJ | Boy Jesus |
| BJC | Barnes Jewish Christian |
| BJC | Bethesda Jewish Congregation |
| BK | Brahma Kumaris |
| BKIK | Bonus Kompetisi Ibadah Keagamaan (Indonesian: Religious Worship Competition Bonus) |
| BKY | Before Kali-Yuga |
| BLA | Bahia de Los Angeles |
| BLAB | Be Linked As Believers |
| BLACK | Believer's Living After Christ's Order |
| BLAST | Big Loud Awesome Spiritual Thang |
| BLBC | Bullitt Lick Baptist Church |
| BLC | Buddhist Life Circle |
| BLCC | Beechwood Lake Christian Camp |
| BLCC | Brainerd Lakes Catholic Churches |
| BLCP | Buddhist Library Cambodia Project |
| BLCS | Bishop Larkin Catholic School |
| BLE | Biblical Leadership For Excel |
| BLMC | Baptist-Lutheran Medical Center (Kansas City, MO) |
| BLOOD | Believers Living Out Our Deaths |
| BLT | Bible Learning Together |