- Glacial valley
- Glaciation
- Glacier mass balance
- Glacier terminus
- Glaciofluvial deposits
- Glaciolacustrine
- Glaciolacustrine deposits
- Glaciology
- Gland
- Glare
- Glaser coupling
- Glass
- Glass cloth
- Glass cockpits
- Glass electrode
- Glass fiber
- Glass fibre
- Glass formation
- Glass knives
- Glass melting furnace
- Glass microspheres
- Glass production
- Glass recycling
- Glass rod
- Glass transition
- Glass transition temperature
- Glass tubes
- Glass wool
- Glass-ceramic
- GlassFish
- Glasses
- Glassmaking
- Glassy carbon
- Glauberite
- Glaucodot
- Glaucoma
- Glaucoma surgery
- Glauconite
- Glaucophane
- Glaze
- Glaze ice
- Glazed tile
- Glazing
- Glenohumeral ligament
- Glenoid
- Glenoid fossa
- Glenoid labrum
- Glia
- Gliadin
- Glial cells
- Glial scar
- Glibenclamide
- Glidants
- Glidcop
- Glide planes
- Glide ratio
- Glide reflection
- Glider
- Glideslope
- Gliding
- Gliding flight
- Gliding motility
- Glimmer
- Glioblastoma
- Glioma
- Glitches
- GloVe
- Glob
- Global Wind Atlas
- Global analysis
- Global anomaly
- Global brain
- Global field
- Global heritage stone resource
- Global illumination
- Global medical device nomenclature
- Global meteoric water line
- Global network
- Global optimization
- Global relief model
- Global sourcing
- Global surface temperature
- Global warming potential
- Global waste trade
- Globalization
- Globally Harmonized System of Classification and Labelling of Chemicals
- Globar
- Globe valves
- Globin
- Globular proteins
- Glomalin
- Glomerular basement membrane
- Glomerulonephritis
- Glomerulosclerosis
- Glomerulus
- Gloss
- Glossmeter
- Glossy
- Glottal
- Glovebox
- Glow discharge
- Glucagon
- Glucagon receptor
- Glucagon-like peptide-1
- Glucan
- Glucanase
- Glucaric acid
- Glucoamylase
- Glucocorticoid receptor
- Glucocorticoids
- Glucomannan
- Gluconeogenesis
- Gluconic acid
- Glucono delta-lactone
- Glucosamine
- Glucose
- Glucose 1-phosphate
- Glucose 6-phosphatase
- Glucose 6-phosphate
- Glucose homeostasis
- Glucose metabolism
- Glucose meter
- Glucose oxidase
- Glucose syrup
- Glucose test
- Glucose tolerance
- Glucose tolerance test
- Glucose transporters
- Glucose uptake
- Glucose-1-phosphate
- Glucose-6-phosphate
- Glucose-6-phosphate isomerase
- Glucose-dependent insulinotropic polypeptide
- Glucosidase
- Glucosides
- Glucosinolates
- Glucosylceramide
- Glucosyltransferase
- Glucuronic acid
- Glucuronidation
- Glucuronide
- Glucuronosyltransferase
- Glucuronoxylan
- Glued laminated timber
- Glufosinate
- Gluon
- Gluon field
- Glut1
- Glut2
- Glut3