| Abbreviation | Definition |
|---|---|
| BSWC | British Second Wives Club |
| BTAC | Batesville Torpedos Aquatic Club |
| BTAC | Beaucaire Tarascon Aquatic Club |
| BTBC | Big Trail Bike Club |
| BTBC | Bromley Town Bowling Club |
| BTCB | Beckson Tennis Club Brummen |
| BTCF | Berkeley Tennis Club Foundation |
| BTCF | Bimmer Tuning Club Finland |
| BTCF | Bimmer Tuning Club of Finland |
| BTCN | Boston Terrier Club Nederland |
| BTDC | Bottom Time Dive Club |
| BTFC | Bangsar Taekwondo Fitness Club |
| BTFC | Basingstoke Town Football Club |
| BTFC | Billericay Town Football Club |
| BTFC | Boston Taxi Football Club |
| BTFC | Brackley Town Football Club |
| BTGC | Bukit Tinggi Golf Club |
| BTGC | Butterfield Trail Golf Club |
| BTRC | Bellingham Trail Running Club |
| BTSC | British Two Stroke Club |