| Acronym | Meaning |
| BBS | Bulletin Board System |
| BBSRC | Biotechnology And Biological Sciences Research Council |
| BBXRT | Broad Band X-Ray Telescope |
| BCA | Bicinchoninic Acid |
| BCA | Binary-collision Approximation |
| BCAA | Branched-chain Amino Acids |
| BCAD | Business Computer-aided Manufacturing |
| BCC | Brueckner Coupled Cluster |
| BCC | Basal Cell Carcinoma |
| BCC | Bioaccumulative Chemicals Of Concern |
| BCC | Body Centered Cubic |
| BCCD | Brueckner Coupled Cluster With Double Excitations |
| BCCD | Betaine Calcium Chloride Dihydrate |
| BCCP | Biotin Carboxyl-carrier Protein |
| BCDF | B Cell Differentiation Factor |
| BCF | Bulked Continuous-filament |
| BCF | Beneficiated Coal Fuel |
| BCF | Bioconcentration Factor |
| BCG | Bacillus Calmette-Guerin |
| BCGA | British Compressed Gases Association |
| BCGF | B Cell Growth Factor |
| BCIRA | British Cast Iron Research Association |
| BCKA | Branched-chain Keto-acid |
| BCKD | Branched-chain Alpha-ketoacid Dehydrogenase |
| BCM | Bond Charge Model (in Force Constants Calcn.) |
| BCMA | B-cell Maturation Antigen |
| BCNTF | Biofilm-Controlled Nitrifying Trickling Filter (for Wastewater Treatment) |
| BCO | Bounded Crystal Orbital |
| BCOE | Barrels Of Crude Oil Equivalent |
| BCP | B-cell Precursor |
| BCP | Biphasic Calcium Phosphate |
| BCP | Bromocresol Purple |
| BCPB | Bromochlorophenol Bluepar |
| BCPC | British Crop Protection Council |
| BCPCT | Best Conventional Pollutant Control Technology |
| BCR | B Cell Receptors |
| BCR | Bureau Communitaire De Reference (of The CEE = Commission Of European Communities |
| BCR | Bubble Column Reactor |
| BCRLM | Bending-corrected Rotating Linear Model (for Reactive Scattering) |
| BCRNM | Bending Corrected Rotating Nonlinear Model |
| BCRU | British Committee On Radiation Units And Measurements |
| BCRW | Bridge Contacted Ridge Waveguide |
| BCS | Bardeen-Cooper-Schrieffer |
| BCS | Bragg Crystal Spectrometer |
| BCS | British Chemical Standard |
| BCS-CRM | British Chemical Standard-Certified Reference Material |
| BCSC | Buried Contact Solar Cell |
| BCSCO | Bismuth Calcium Strontium Copper Oxide |
| BCSLN | Bardeen-Cooper-Schrieffer-Lipkin-Nogami (model In Calcns. On Molecules With Quantum Field Theory) |
| BCSLN-HL(N) | Bardeen-Cooper-Schrieffer-Lipkin-Nogami-Heitler-London(n) (n Is Nth-order MBPT Starting From The Self-consistent HL Model) |