| Abbreviation | Definition |
|---|---|
| BNC | Britsh Naval Connector |
| BNL | Base Naval de Lisboa |
| BNS | Bangladesh Naval Ship |
| BNS | Belgian Navy Ship |
| BNY | Brooklyn Navy Yard |
| BOSN | Boatswain |
| BOSN | Chief Boatswain |
| BOST | Basic Operational Sea Training |
| BOY1 | Boy 1st Class |
| BOY2 | Boy 2nd Class |
| BOY3 | Boy 3rd Class |
| BR1 | Boilermaker Petty Officer 1st Class |
| BRC | Boilermaker Chief Petty Officer |
| BRCM | Boilermaker Master Chief Petty Officer |
| BRCS | Boilermaker Senior Chief Petty Officer |
| BRNC | Britannia Royal Naval College |
| BRNC | Britannia Royal Navy College |
| BSNINCHRG | Boatswain's Mate In Charge |
| BSNYEO | Boatswain's Yeoman |
| BSR | Boilermaker (ship Repair) |