- Brake
- Brake shoes
- Branching
- Brass
- Bravais lattice
- Brazier effect
- Brazing
- Breakdown voltage
- Breaker
- Breakwaters
- Breast cancer
- Breast implants
- Breathability
- Breathing
- Breeder reactor
- Bricks
- Brickwork
- Bridges
- Bridging ligand
- Brillouin scattering
- Brillouin zone
- Brine
- Brinelling
- Briquettes
- Brittleness
- Broaching
- Broadband
- Broadcasting
- Bromide
- Brominated flame retardants
- Bromine
- Bromothymol blue
- Bronchodilators
- Bronze
- Brookite
- Brownian motion
- Brownmillerite
- Brucite
- Brushes
- Brutalist architecture
- Bubbles
- Bucket
- Buckling
- Buckminsterfullerene
- Buckypaper
- Buffer solution
- Building codes
- Building envelope
- Building insulation
- Building material
- Building services engineering
- Building-integrated photovoltaics
- Buildingsmart
- Bulk density
- Bulk modulus
- Bulldozer
- Bullets
- Bullous pemphigoid
- Bump mapping
- Bumper
- Bunsen burner
- Buoyancy
- Burgers vector
- Burn
- Burnup
- Burrs
- Bus
- Bushveld Igneous Complex
- Business jets
- Business processes
- Butadiene
- Butane
- Buttress dam
- CAD
- CALPHAD
- CANDU reactor
- CBR
- CCD
- CCVD
- CD players
- CEFR
- CFL
- CIGS
- CMM
- CMOS
- CNG
- CPM
- CPT
- CPU
- CRSS
- CSP
- CT scan
- CVD
- CVI
- CVT
- CZT
- Cable tray
- Cadmium
- Cadmium sulfide
- Caesium
- Caesium bromide
- Caesium chloride
- Caesium-137
- Caissons
- Caking
- Calamine
- Calc-silicate rock
- Calcareous
- Calcific tendinitis
- Calcination
- Calcite
- Calcitonin
- Calcium
- Calcium Chromate
- Calcium acetate
- Calcium aluminate cement
- Calcium aluminates
- Calcium aluminoferrite
- Calcium aluminosilicate
- Calcium bicarbonate
- Calcium carbide
- Calcium carbonate
- Calcium channels
- Calcium chloride
- Calcium citrate
- Calcium fluoride
- Calcium gluconate
- Calcium hydride
- Calcium hydroxide
- Calcium hypochlorite
- Calcium lactate
- Calcium magnesium acetate
- Calcium nitrate
- Calcium nitride
- Calcium nitrite
- Calcium oxalate
- Calcium peroxide
- Calcium phosphate
- Calcium pyrophosphate
- Calcium silicate
- Calcium silicate hydrate
- Calcium sulfate
- Calcium sulfite
- Calcium-48
- Calcium-binding proteins
- Calculus
- Calderas
- Caliche
- California Gold Rush
- Caloric theory