China 
Africa 
- Gonadotropin releasing hormone
- Gonadotropin releasing hormone agonist
- Gonadotropin releasing hormone analogue
- Gonadotropin-releasing hormone receptor
- Gonadotropins
- Gonads
- Gonane
- Goniometer
- Goniometry
- Gonioscopy
- Gonococcal conjunctivitis
- Gonococcal urethritis
- Gonocytes
- Gonopods
- Good Samaritan law
- Good syndrome
- Goodpasture syndrome
- Google Flu Trends
- Google Health
- Goose bumps
- Gooseberries
- Gordon syndrome
- Gordonia
- Gorlin syndrome
- Goserelin
- Gossypetin
- Gossypol
- Gout
- Gowers' sign
- Gowers's sign
- Gper
- Grab bars
- Gracile fasciculus
- Gracile nucleus
- Gracilis
- Gracilis muscle
- Graded exercise therapy
- Gradenigo's syndrome
- Gradient echo
- Grading
- Graft
- Graft copolymer
- Graft rejection
- Graft-versus-host disease
- Graft-versus-tumor effect
- Grafting
- Graham patch
- Grain crops
- Gram negative anaerobic cocci
- Gram negative bacteria
- Gram negative folliculitis
- Gram positive bacteria
- Gram positive cocci
- Gram staining
- Gram-negative folliculitis
- Gramicidin
- Gramicidin S
- Gramine
- Grand rounds
- Grandiose delusion
- Grandiosity
- Grandmother hypothesis
- Granisetron
- Granular cell tumor
- Granular layer
- Granulation
- Granulation tissue
- Granule cells
- Granules
- Granulicatella
- Granulin
- Granulocyte
- Granulocyte colony stimulating factor
- Granulocyte colony-stimulating factor
- Granulocyte colony-stimulating factor receptor
- Granulocyte transfusion
- Granulocyte-macrophage colony-stimulating factor
- Granulocytopenia
- Granulocytosis
- Granuloma annulare
- Granuloma gluteale infantum
- Granuloma inguinale
- Granulomas
- Granulomatosis with polyangiitis
- Granulomatous amoebic encephalitis
- Granulomatous inflammation
- Granulomatous mastitis
- Granulomatous prostatitis
- Granulopoiesis
- Granulosa cell tumor
- Granulosa cell tumour
- Granulosa cells
- Granzyme
- Granzyme A
- Granzyme b
- Grape juice
- Grape seed extract
- Grape seeds
- Grapefruit juice
- Grapeseed oil
- Graphene
- Graphite
- Graphitic carbon nitride
- Gratitude
- Graves' disease
- Graves' ophthalmopathy
- Gravimetry
- Gravitropism
- Gray
- Gray baby syndrome
- Gray matter
- Gray matter heterotopia
- Gray platelet syndrome
- Gray rami communicantes
- Grayanotoxin
- Grayscale
- Grazoprevir
- Greasy hair
- Great Oxidation Event
- Great auricular nerve
- Great cardiac vein
- Great cerebral vein
- Great saphenous vein
- Great vessels
- Greater Trochanteric Pain Syndrome
- Greater occipital nerve
- Greater omentum
- Greater palatine foramen
- Greater palatine nerve
- Greater petrosal nerve
- Greater sciatic foramen
- Greater sciatic notch
- Greater splanchnic nerve
- Greater trochanter
- Greater tubercle
- Greater wing of sphenoid bone
- Green beans
- Green chemistry
- Green coffee extract
- Green fluorescent protein
- Green leaf volatiles
- Green leafy vegetables
- Green nail syndrome
- Greenstick fractures
- Grenz rays
- Grepafloxacin
- Grey Turner's sign
- Grey matter
- Grid cells
- Grief