China 
Africa 
- Bulk viscosity
- Bulkheads
- Bulldozer
- Bulletproof vests
- Bullets
- Bullous pemphigoid
- Bump function
- Bump mapping
- Bumper
- Bumpers
- Bumping
- Bumps
- Bundle adjustment
- Bundle branch block
- Bundle branches
- Bunds
- Bunkering
- Bunkers
- Bunsen burner
- Bunsen reaction
- Buoyancy
- Buoyancy engine
- Buprenorphine
- Burden of proof
- Burette
- Burger's equation
- Burgers vector
- Buried valley
- Burkholderia cepacia
- Burkholderia cepacia complex
- Burkholderia mallei
- Burkholderia pseudomallei
- Burkitt lymphoma
- Burlap
- Burma Plate
- Burn
- Burning plasma
- Burnished
- Burnishing
- Burnout
- Burnup
- Burr distribution
- Burra
- Burrs
- Bursae
- Bursitis
- Burst error
- Burst fracture
- Burst noise
- Burstiness
- Bursting
- Buruli ulcer
- Bus
- Bus contention
- Bus lanes
- Bus network
- Bus stops
- Busbars
- Buserite
- Bush-hammered
- Bushel
- Bushings
- Bushveld Igneous Complex
- Business Process Model and Notation
- Business analyst
- Business analytics
- Business as usual
- Business case
- Business continuity
- Business continuity planning
- Business economics
- Business informatics
- Business intelligence
- Business jets
- Business logic
- Business metadata
- Business model canvas
- Business operations
- Business process automation
- Business process interoperability
- Business process mapping
- Business process modeling
- Business process re-engineering
- Business process reengineering
- Business processes
- Business reference model
- Business rules engine
- Business simulations
- Business software
- Business valuation
- Busulfan
- Butadiene
- Butane
- Butane torch
- Butanediol
- Butanediol fermentation
- Butanethiol
- Butanol
- Butanone
- Butene
- Buthionine sulfoximine
- Butler matrix
- Butt welding
- Butterfly curve
- Butterfly effect
- Butterfly valves
- Butterworth filter
- Buttes
- Button cell
- Buttress dam
- Butyl acetate
- Butyl acrylate
- Butyl butyrate
- Butyl cyanoacrylate
- Butyl rubber
- Butylated hydroxyanisole
- Butylated hydroxytoluene
- Butylparaben
- Butyraldehyde
- Butyric acid
- Butyrylcholine
- Butyrylcholinesterase
- Buzzers
- Bxpc-3
- By mouth
- Bypass ratio
- Bypass surgery
- Bystander effect
- Byte pair encoding
- Byteflight
- Bytes
- Bytownite
- Byzantine fault
- Byzantine fault tolerance
- C band
- C check
- C fibers
- C standard library
- C to HDL
- C*-algebra
- C++ AMP
- C++11
- C-H activation
- C-K theory
- C-RAN
- C-dna
- C-element
- C-fos
- C-jun n-terminal kinases
- C-met