| Acronym | Meaning |
| BEST | Bare Essentials Of Surface Transfer |
| BEST | Basic Extractive Sludge Treatment |
| BET | Brunauer-Emmett-Teller (isotherm Equation) |
| BET | Bond Equilibrium Theory |
| BEW | Base (or Biological) Equivalent Weight |
| BEWS | Biological Early Warning Systems |
| BF | Bright Field |
| BFAF | Beamformer Antialiasing Filter |
| BFB | Bubbling Fluidized Bed |
| BFBF | Body Frame Bessel Function |
| BFBR | Biological Fluidized Bed Reactor |
| BFEM | Bright Field Electron Microscopy |
| BFFAR | Benthic Foraminifera Accumulation Rate |
| BFGF | Basic Fibroblast Growth Factor |
| BFR | Brominated Flame Retardant(s) |
| BFS | Blast Furnace Slag |
| BFS | Beam Foil Spectroscopy |
| BFT | Bonded Function Theory |
| BFU-E | Burst-forming Unit-erythroid |
| BGA | Bundesgesundheitamt (German Health Ministry) |
| BGA | Ball Grid Array [electronic Packaging] |
| BGC | Biogeochemical Cycling |
| BGE | Background Electrolyte |
| BGG | Bovine Gamma Globulin |
| BGH | Bovine Growth Hormone |
| BGK | Bhatnagar-Gross-Krook (kinetic-theory Model For Reactive Collisions) |
| BGO | Bismuth Germanium Oxide |
| BGS | Below Ground Surface |
| BH | Barbanis Hamiltonian |
| BHA | 3-tert-butyl-4-hydroxyanisole Par |
| BHA | Butylated Hydroxyanisole |
| BHC | Benzene Hexachloride |
| BHET | Bis(2-hydroxyethyl) Terephthalate |
| BHF | Broken-symmetry Hartree-Fock |
| BHGM | Borehole Gravity Meter |
| BHK | Baby Hamster Kidney |
| BHMA | British Hard Metal Association |
| BHMF | Black Hole Mass Functionpar |
| BHMT | Betaine-homocysteine Methyltransferase |
| BHN | Brinell Hardness Number |
| BHP | Bottom-hole Pressure |
| BHR | Bronchial Hyperresponsiveness |
| BHRA | British Hydromechanics Research Association |
| BHSIP | Bottom-hole Shut-in Pressure |
| BHT | Brinell Hardness Test |
| BHT | Bottom-hole Temperature |
| BHT | Butylated Hydroxytoluene |
| BHTV | Borehole Televiewers |
| BI | Bond Increment (method In Calcns. On Large Molecules) |
| BIA | Biochemical Induction Assay |