China 
Africa 
- Back pain
- Back pressure
- Back-arc
- Back-arc basins
- Back-end
- Back-end database
- Back-of-the-envelope calculations
- Backbone
- Backbone chassis
- Backbone network
- Backend
- Backend as a service
- Backfire
- Backflow
- Backflow prevention device
- Background music
- Background noise
- Background radiation
- Backhaul
- Backhoe
- Backhoe loader
- Backlash
- Backlight
- Backlighting
- Backlinks
- Backpack
- Backplanes
- Backpropagation
- Backpropagation through time
- Backscatter
- Backstepping
- Backtesting
- Backtracking
- Backtracking line search
- Backup generator
- Backup software
- Backups
- Backward chaining
- Backward compatibility
- Backward induction
- Backwashing
- Baclofen
- Bacteremia
- Bacteria
- Bacterial cellulose
- Bacterial conjugation
- Bacterial growth
- Bacterial infections
- Bacterial lawn
- Bacterial microcompartments
- Bacterial motility
- Bacterial nanowires
- Bacterial oxidation
- Bacterial phyla
- Bacterial toxins
- Bacteriochlorophyll
- Bacteriocin
- Bacteriology
- Bacteriophages
- Bacteriorhodopsin
- Bacteriuria
- Bacteroidales
- Bacteroides fragilis
- Bad
- Baddeleyite
- Badlands
- Baffles
- Bag of words
- Bag-of-words model
- Bagasse
- Baghouses
- Bagnold number
- Bagplot
- Bags
- Bahareque
- Baicalein
- Baicalin
- Bainite
- Bake-out
- Balance
- Balance equation
- Balance of plant
- Balance of system
- Balance shafts
- Balanced circuits
- Balanced lines
- Balanced matrix
- Balanced rudder
- Balanced salt solution
- Balanced scorecard
- Balancer chromosomes
- Balancing authority
- Baled
- Balises
- Balkan endemic nephropathy
- Ball
- Ball and beam
- Ball and socket joints
- Ball bearings
- Ball bonding
- Ball chain
- Ball clay
- Ball joint
- Ball mill
- Ball of the foot
- Ball screws
- Ball valve
- Ball-and-beam
- Ball-and-socket joints
- Ballast
- Ballast tanks
- Ballast water
- Ballistic conduction
- Ballistic gelatin
- Ballistic impact
- Ballistic nylon
- Ballistic trajectory
- Ballistics
- Ballistocardiography
- Ballonets
- Balloon tamponade
- Balloons
- Balun
- Balustrade
- Bamboo
- Bamboo charcoal
- Bamboo construction
- Bamboo textile
- Ban
- Banach algebra
- Banach fixed-point theorem
- Banach spaces
- Band 3
- Band II
- Band III
- Band bending
- Band brake
- Band diagram
- Band gap
- Band matrix
- Band rejection
- Band-gap engineering
- Band-pass filters
- Band-stop filter
- Banded iron formation
- Bandelier Tuff
- Bandgap engineering
- Bandgap voltage reference
- Bandlimited
- Bands