| Abbreviation | Definition |
|---|---|
| BMU | Basic Mercenary Unit |
| BMU | BeachMaster Unit |
| BMW | Bomb Wing |
| BMW | Bonteheuwel Military Wing |
| BMWA | Ballistic Missile Warning of Attack |
| BN | Ballistic Nuclear |
| BN | Battalion |
| BN | Bombardier - Navigator |
| BNACC | Banff National Army Cadet Camp |
| BNCA | British National Cadet Association |
| BNCC | Bangladesh National Cadet Corps |
| BNCDR | Batallion Commander |
| BNCO | Battalion Commanding Officer |
| BNCOC | Basic Noncommissioned Officer Course |
| BNCOC | Basic Non-Commissioned Officer Course |
| BNCP | Battalion Command Post |
| BND | Batallion Northern Division |
| BND | BundesNachrichtenDienst (Federal Intelligence Service) |
| BNFEX | Battalion Field Exercise |
| BNGRS | British National Grid Reference System |