- Gadwall
- Galah
- Gang-gang Cockatoo
- Garden Sunbird
- Giant Coot
- Giant Cowbird
- Gibberbird
- Glaucous-winged Gull
- Glaucous Gull
- Glittering-throated Emerald
- Glossy Ibis
- Golden-breasted Bunting
- Golden-collared Woodpecker
- Golden-headed Cisticola
- Golden-headed Manakin
- Golden-sided Euphonia
- Golden-spangled Piculet
- Golden-winged Sunbird
- Gouldian Finch
- Graceful Honeyeater
- Grassland Sparrow
- Great-billed Hermit
- Great-tailed Grackle
- Great Black Hawk
- Great Blue Heron
- Great Bowerbird
- Great Egret
- Great Frigatebird
- Great Horned Owl
- Great Kiskadee
- Great Knot
- Great Myna
- Great Potoo
- Great Tit
- Great White Pelican
- Greater Ani
- Greater Crested Tern
- Greater Double-collared Sunbird
- Greater Flamingo
- Greater Kestrel
- Greater Racket-tailed Drongo
- Greater Sand Plover
- Greater Scaup
- Greater Striped Swallow
- Greater Vasa Parrot
- Greater Yellow-headed Vulture
- Greater Yellowlegs
- Green-backed White-eye
- Green-rumped Parrotlet
- Green-tailed Goldenthroat
- Green-tailed Jacamar
- Green-tailed Towhee
- Green-throated Mango
- Green-winged Pytilia
- Green Aracari
- Green Honeycreeper
- Green Kingfisher
- Green Oriole
- Green Oropendola
- Green Pygmy Goose
- Grey-backed Fiscal
- Grey-breasted Martin
- Grey-breasted Sabrewing
- Grey-capped Social Weaver
- Grey-cowled Wood Rail
- Grey-crowned Babbler
- Grey-crowned Flatbill
- Grey-eared Honeyeater
- Grey-fronted Dove
- Grey-fronted Green Pigeon
- Grey-fronted Honeyeater
- Grey-headed Gull
- Grey-headed Honeyeater
- Grey-headed Kingfisher
- Grey-headed Kite
- Grey-headed Lovebird
- Grey-headed Robin
- Grey-lined Hawk
- Grey Antwren
- Grey Butcherbird
- Grey Crowned Crane
- Grey Cuckooshrike
- Grey Currawong
- Grey Fantail
- Grey Gull
- Grey Heron
- Grey Kingbird
- Grey Plover
- Grey Shrikethrush
- Grey Teal
- Grey Whistler
- Greyish Mourner
- Greylag Goose
- Griffon Vulture
- Guanay Cormorant
- Guianan Cock-of-the-rock
- Guianan Puffbird
- Guianan Toucanet
- Guianan Tyrannulet
- Guianan Warbling Antbird
- Gull-billed Tern