China 
Africa 
- GVWR
- GW approximation
- GWAS
- GWT
- Gabaa receptor
- Gabardine
- Gabbro
- Gabions
- Gabor filter
- Gabor transform
- Gadolinium
- Gadolinium oxide
- Gadolinium oxysulfide
- Gadolinium-doped ceria
- Gag
- Gahnite
- Gain
- Gain compression
- Gain medium
- Gain scheduling
- Gain stage
- Gain-bandwidth product
- Gain-switching
- Gait
- Gait analysis
- Gait cycle
- Galactan
- Galactokinase
- Galactolipids
- Galactooligosaccharides
- Galactosamine
- Galactose
- Galactose 1-phosphate
- Galactosemia
- Galactosidase
- Galactosidases
- Galactoside
- Galacturonic acid
- Galaxite
- Galaxolide
- Galaxy Zoo
- Gale
- Gale warning
- Galectin-3
- Galena
- Galerkin method
- Galfenol
- Galilean invariance
- Galilean transformation
- Galinstan
- Gallbladder
- Gallbladder disease
- Gallic acid
- Galling
- Gallium
- Gallium arsenide
- Gallium arsenide phosphide
- Gallium fluoride
- Gallium nitrate
- Gallium nitride
- Gallium oxide
- Gallium phosphate
- Gallium phosphide
- Gallium selenide
- Gallocatechin gallate
- Gallons
- Gallotannin
- Gallstones
- Galois connections
- Galois theory
- Galvani potential
- Galvanic anodes
- Galvanic cells
- Galvanic corrosion
- Galvanic isolation
- Galvanic series
- Galvanism
- Galvanization
- Galvanized
- Galvanized steel
- Galvannealed
- Galvanotaxis
- Gambler's fallacy
- Game controllers
- Game design
- Gameplay
- Gamers
- Gametes
- Gametogenesis
- Gamification
- Gamification of learning
- Gamma camera
- Gamma correction
- Gamma counter
- Gamma distribution
- Gamma function
- Gamma process
- Gamma ray logging
- Gamma rays
- Gamma secretase
- Gamma spectroscopy
- Gamma waves
- Gamma-ray astronomy
- Gammaproteobacteria
- Gammatone filter
- Ganglia
- Ganglion
- Ganglion cell
- Ganglion cell layer
- Ganglion cysts
- Gangliosides
- Gangrene
- Gangue
- Ganister
- Gansu Wind Farm
- Gantry
- Gantry cranes
- Gantt charts
- Gap analysis
- Gap junctions
- GarageBand
- Garbage
- Garbage collection
- Garbage disposal
- Garbage patches
- Garden City
- Garden city movement
- Garnet
- Garnierite
- Garter spring
- Gartner Hype Cycle
- Gas blending
- Gas burner
- Gas carriers
- Gas centrifuges
- Gas chromatography
- Gas chromatography-mass spectrometry
- Gas composition
- Gas constant
- Gas cylinders
- Gas detectors
- Gas diffusion electrode
- Gas discharge
- Gas dynamics
- Gas engines
- Gas exchange
- Gas explosions
- Gas flare
- Gas generator
- Gas heater