| Abbreviation | Definition |
|---|---|
| BS | Bear Spotter |
| BS | Black Swallowtail |
| BSA | Bovine Serum Albumin |
| BSAS | British Society of Animal Science |
| BSAVA | British Small Animal Veterinary Association |
| BSCP | Bovine Spinal Cord Protein |
| BSDM | Balancing Side Deep Masseter |
| BSE | Breeding Sheep Examination |
| BSO | Blood Stock Only |
| BST | Brown Spotted Tabby |
| BSTP | British Society of Toxicological Pathologists |
| BSVP | British Society of Veterinary Pathology |
| BTB | bovine TuBerculosis |
| BTF | British Turkey Federation |
| BTO | British Trust for Ornithology |
| BUAV | British Union for the Abolition of Vivisection |
| BUFF | Buffalo |
| BUNS | Bunnies Urgently Needing Shelter |
| BV | Breeding Value |
| BVA | British Veterinary Association |