| Acronym | Meaning |
| BMP | Bone Morphogenetic Proteins |
| BMPR | Bone Morphogenetic Protein Receptor |
| BMR | Basal Metabolic Rate |
| BMRB | Bio Mag Res Bank |
| BMRC | British Medical Research Council |
| BMS | Bristol-Myers Squibb |
| BMS | Buried Metallic Sulfide |
| BMSC | Bone Marrow Stromal Cell |
| BMT | Bone Marrow Transplantation |
| BMV | Berthier-Millie-Veillard Method (semiempirical MO-SCF) |
| BMW | Boiler Maintenance Workstation [EPRI Software] |
| BMWI | Biomedical Waste Incinerator |
| BMX | Brominated MX |
| BN | Boron Nitride |
| BNA | Bureau Of National Affairs |
| BNCT | Boron Neutron Capture Therapy |
| BNF | Biological Nitrogen Fixation |
| BNFL | British Nuclear Fuels Laboratory |
| BNL | Brookhaven National Laboratory |
| BNN | Back-propagation Neural Network |
| BNP | Brain Natriuretic Peptide |
| BNR | Biological Nutrient Removal |
| BO | Born Oppenheimer |
| BO | Brueckner Orbital |
| BO | Biorthonormal (wave Function) |
| BO | Bond Orbital |
| BOA | Born-Oppenheimer Approxn. |
| BOA | Benzyl Octyl Adipate |
| BOA | Bidirectional Orbital Approximation (in Valence Bond Theory) |
| BOA | Bond Orbital Approximation |
| BOA | Bond Orientational Anisotropy |
| BOARS | Born-Oppenheimer Angular Radial Sepn. (in Mol. Complexes Calcns.) |
| BOAW | Bond-order Alternation Wave |
| BOC | Bond-order Conservation (model In Calcns. On Reactions) |
| BOC-MP | Bond Order Conservation-morse Potential |
| BOCLE | Ball-on Cylinder Lubricity Evaluator |
| BOCV | Biorthogonality Constrained Variation Method |
| BOD | Biochemical Oxygen Demand |
| BODC | Born-Oppenheimer Diagonal Correction (in Mol. Calcns.) |
| BODC | British Oceanographic Data Center |
| BODIPY | Dipyrrometheneboron Difluoride |
| BOE | Buffered Oxide Etch |
| BOF | Basic Oxygen Furnace |
| BOFS | Biogeochemical Ocean Flux Study (UK) |
| BOFSUW | Biodegradable Organic Fraction Of Solid Urban Waste |
| BOFT | Bearing Oil Film Thickness |
| BOHS | British Occupational Hygiene Society |
| BOLD | Blood Oxygenation Level-dependent |
| BOM | Benthic Organic Matter |
| BOM | Biodegradable Organic Matter |