| Abbreviation | Definition |
|---|---|
| BEFA | Boeing Employees Flying Association |
| BEFC | Boeing Employees Flying Club |
| BEFC-STL | Boeing Employees Flying Club - St. Louis |
| BEFC-W | Boeing Employees Flying Club - Wichita |
| BFH | Big Friendly Horses |
| BFSW | Bydgoskiego Fanklubu Star Wars |
| BGFA | Bowland Game Fishing Association |
| BHAC | Brandlecht Hestruper AktienClub |
| BHB | Big Horse Brigade |
| BHMA | Bald-Headed Men of America |
| BIMCC | Brussels International Map Collectors' Circle |
| BINGO | Birding In Nature's Great Outdoors |
| BITD | Best In The Desert Racing Association |
| BKF | Brighton Kite Flyers |
| BLOW | Benevolent Loyal Order of Witsters |
| BLS | Black Label Society |
| BLS | Blue Locker Society |
| BMC | Black Mustang Club |
| BMR | Bekonscot Model Railway |
| BMS | Black Mesa Source |