- BM (Boatswain's Mate)
- B.M. (Bonae Memoriae ("Of Happy Memory"))
- BM/C3 (Ballistic Missile/ Command, Control, and Communications)
- BM1 (Boatswain's Mate First Class)
- BM2 (Boatswain's Mate Second Class)
- BM3 (Boatswain's Mate Third Class)
- BMA (British Medical Association)
- BMAC (Barneys Monday Afternoon Club)
- BMAR (Backlog, Maintenance, and Repair)
- BMB (Bumbar Airport)
- BMC (Brigham City Airport)
- BMC3I (Battlefield Management Command, Control, Communications, and Intelligence)
- BMC4I (Battle Management Command, Control, Communications, Computers, and Intelligence)
- BMCC (Borough of Manhattan Community College)
- BMCM (Master Chief Boatswain's Mate)
- BMCS (Branch Movement Control System)
- BMCT (Beginning of Morning Civil Twilight)
- BMD (Ballistic Missile Defence)
- BMDG (British Military Doctrine Group)
- BMDL (Below Method Detection Limits)
- BMDO ((U.S.) Ballistic Missile Defense Organization ("bim-do"))
