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- Brillouin zone
- Brine
- Brine pools
- Brine rejection
- Brinelling
- Briquettes
- Brisance
- Brise soleil
- Britannia metal
- British construction industry
- Brittle
- Brittleness
- Brivaracetam
- Brix
- Broaching
- Broad ligament
- Broad-spectrum antiviral drugs
- Broadband
- Broadband Integrated Services Digital Network
- Broadcast
- Broadcast encryption
- Broadcasting
- Brocadia anammoxidans
- Brochantite
- Bromate
- Bromelain
- Bromide
- Brominated flame retardants
- Bromine
- Bromine number
- Bromine water
- Bromobenzene
- Bromochloromethane
- Bromodichloromethane
- Bromoform
- Bromomethane
- Bromophenol
- Bromophenol blue
- Bromothymol blue
- Bromotrifluoromethane
- Bromous acid
- Bromoxynil
- Bronchi
- Bronchial
- Bronchial hyperresponsiveness
- Bronchiole
- Bronchiolitis
- Bronchoalveolar lavage
- Bronchoconstriction
- Bronchodilators
- Bronchoscopy
- Bronopol
- Bronze
- Brookite
- Broth
- Brouwer fixed-point theorem
- Brown carbon
- Brown sugar
- Brownfield
- Brownian Dynamics
- Brownian motion
- Brownian noise
- Brownmillerite
- Brownouts
- Browser engine
- Browser extensions
- Browser wars
- Browsing
- Browsing history
- Brucella abortus
- Brucellosis
- Brucite
- Brugada syndrome
- Bruise
- Bruising
- Bruit
- Brunton compass
- Brus equation
- Brush border
- Brushed
- Brushes
- Brushite
- Brutalist
- Brutalist architecture
- Brute-force attacks
- Brute-force search
- Bt
- Bubble chamber
- Bubble column reactor
- Bubble gum
- Bubble point
- Bubble pressure method
- Bubble sort
- Bubbles
- Buccal
- Buck converter
- Buck-boost converter
- Bucket
- Bucket chain excavator
- Bucket elevator
- Bucket sort
- Bucket-wheel excavator
- Buckingham potential
- Buckle
- Buckling
- Buckling-restrained brace
- Buckminsterfullerene
- Buckypaper
- Budesonide
- Budgeted cost of work performed
- Buffer
- Buffer amplifier
- Buffer overflows
- Buffer solution
- Buffer strips
- Buffered charcoal yeast extract agar
- Buffered oxide etch
- Buffers
- Buffy coat
- Bugs
- Build automation
- Build to order
- Build to stock
- Building
- Building automation
- Building blocks
- Building codes
- Building design
- Building diagnostics
- Building engineer
- Building envelope
- Building inspection
- Building insulation
- Building life cycle
- Building lifecycle management
- Building material
- Building performance
- Building performance simulation
- Building services engineering
- Building-integrated photovoltaics
- Buildingsmart
- Built up edge
- Built-up edge
- Bulbous bow
- Bulk density
- Bulk flow
- Bulk micromachining
- Bulk modulus
- Bulk polymerization
- Bulk temperature