| Acronym | Meaning |
| BIA | Batch Injection Analysis |
| BIA | Bioelectric Impedance Analysis |
| BIA | Biospecific Interaction Analysis |
| BIAS | Bismuth-active Substance (in Surfactant Concn. Detn. In Environmental Tests) |
| BIB | Blocked Impurity Band |
| BIBRA | British Industrial Biological Research Association |
| BIC | Bragg Ionization Chamber |
| BICFET | Bipolar Inversion Channel Field-effect Transistor |
| BICINE | N N Bis 2 Hydroxyethyl Glycine |
| BICMOS | Bipolar Complementary Metal Oxide Semiconductor |
| BID | Brinell Indentation Diameter |
| BID | Background Information Document |
| BID | Buoyancy Induced Dispersion |
| BIF | Banded Iron-formation |
| BIF | Boilers And Industrial Furnaces (USEPA Rule) |
| BIFET | Bipolar Field Effect Transistor |
| BIFL | Burst Integrated Fluorescence Lifetime |
| BIG/GT | Biomass Gasifier/gas Turbine (for Steam/electricity Cogeneration) |
| BIIR | Brominated Isobutene-isoprene Rubber |
| BILE | Beam Induced Light Emission |
| BIMOS | Bipolar Metal-oxide Semiconductor |
| BIND | Biomolecular Interaction Network Database |
| BIO-FIX | Biomass Foam Immobilized Extractant |
| BIOFOR | Biogenic Aerosol Formation In The Boreal Forest |
| BIOME | Biological Imaging And Observation/Mission To Earth |
| BIOMOVS | Biosphere Model Validation Study |
| BIOS | Biological Innovation For Open Society |
| BIOS | British Intelligence Objectives Sub-committee |
| BIOS | Biological Data System (file Within STORET) |
| BIOSIS | BioSciences Information Service |
| BIPM | Bureau International Des Poids Et Mesures |
| BIPP | Boron Implanted Polysilicon Pad |
| BIR | Baculovirus IAP Repeat |
| BIRD | Bilinear Rotation Decoupling |
| BIRD | Blackbody Infrared Radiative Dissociation |
| BIRPS | British Institutes Reflection Profiling Syndicate |
| BIS | Bremsstrahlung Isochromat Spectroscopy |
| BIS | Bureau Of Indian Stds. |
| BIS | Bispectral Index |
| BIV | Bovine Immunodeficiency Virus |
| BIXE | Bombardment-induced X-ray Emission |
| BIXS | Beta-ray Induced X-ray Spectrometry |
| BJH | Bopp-Jancso-Heinzinger (potential Function) |
| BJT | Bipolar Junction Transistors |
| BK | Brinkman-Kramers (approxn. In Ion-mol. Collision Quantum Calcn.) |
| BK-DOK | Berufkrankeit Dokumentation (German Occupational Disease Documentation) |
| BKC | Born-von Karman Cell (model For Electronic-structure Calcn.) |
| BKCM | Burkhardt-Konya-Coulson-March (for Electron Momentum Densities) |
| BKD | Backscatter Kikuchi Diffraction |
| BKW | Bobylev-Krook-Wu (method For Solving The Boltzmann Equation For A Mol. System) |