China 
Africa 
- Boyle's law
- Bpp
- Bq
- Braced frame
- Bracelets
- Braces
- Brachial artery
- Brachial plexus
- Brachial veins
- Brachiocephalic artery
- Brachistochrone
- Brachytherapy
- Bracing
- Brackets
- Brackish
- Brackish water
- Bradycardia
- Bradykinesia
- Bradykinin
- Bradykinin receptor
- Bradykinin receptors
- Bradypnea
- Bradyseism
- Braess's Paradox
- Bragg peak
- Bragg's law
- Braggite
- Braided
- Braided rivers
- Braiding machine
- Braille
- Brain
- Brain abscess
- Brain atlas
- Brain biopsy
- Brain cells
- Brain damage
- Brain death
- Brain development
- Brain heart infusion
- Brain implants
- Brain ischemia
- Brain mapping
- Brain metastases
- Brain metastasis
- Brain morphometry
- Brain size
- Brain tumor
- Brain waves
- Brain-reading
- Brainstem
- Brainstorming
- Brake
- Brake assist
- Brake balance
- Brake bias
- Brake fade
- Brake force
- Brake linings
- Brake pads
- Brake shoes
- Brake-by-wire
- Brakes
- Braking chopper
- Braking distance
- Branch and bound
- Branch and cut
- Branch and price
- Branch cut
- Branch points
- Branch prediction
- Branched-chain amino acids
- Branched-chain fatty acids
- Branching
- Branching processes
- Branching ratio
- Branes
- Brass
- Brassinolide
- Brassinosteroids
- Brattice
- Braunite
- Bravais lattice
- Bray Curtis dissimilarity
- Brayton cycle
- Brazier effect
- Brazing
- BrdU
- Breach
- Breadboards
- Break bulk cargo
- Break junctions
- Break-in
- Breakdown
- Breakdown voltage
- Breaker
- Breakeven
- Breaking capacity
- Breakpoints
- Breakthrough therapy
- Breakwaters
- Breast biopsy
- Breast cancer
- Breast development
- Breast implants
- Breast mass
- Breast milk
- Breast pain
- Breast reconstruction
- Breast ultrasound
- Breast-conserving surgery
- Breath analysis
- Breath sounds
- Breath tests
- Breathability
- Breather
- Breathing
- Breccia
- Breccia pipe
- Breeder
- Breeder reactor
- Breeding blanket
- Breeding program
- Brefeldin A
- Bregma
- Bregman method
- Bremsstrahlung
- Brent's method
- Brevetoxin
- Brevibacillus borstelensis
- Brevibacterium linens
- Brewster's angle
- Brick veneer
- Bricks
- Brickwork
- Bridge bearing
- Bridge circuit
- Bridge maintenance
- Bridge rectifiers
- Bridge scour
- Bridge tower
- Bridgeless
- Bridges
- Bridging
- Bridging ligand
- Brief
- Brightness
- Brightness temperature
- Brilliant blue FCF
- Brillouin scattering