- Gadwall
- Galah
- Galapagos Crake
- Galapagos Dove
- Galapagos Flycatcher
- Galapagos Hawk
- Galapagos Martin
- Galapagos Mockingbird
- Galapagos Penguin
- Galapagos Petrel
- Galapagos Shearwater
- Gang-gang Cockatoo
- Garden Emerald
- Garden Warbler
- Garganey
- Gartered Trogon
- Geelvink Fruit Dove
- Geelvink Imperial Pigeon
- Geelvink Pygmy Parrot
- Genovesa Cactus Finch
- Genovesa Ground Finch
- Giant Coua
- Gibberbird
- Gilbert's Whistler
- Gilded Sapphire
- Glaucous Gull
- Glittering-bellied Emerald
- Glittering-throated Emerald
- Glossy-black Thrush
- Glossy-mantled Manucode
- Glossy Flowerpiercer
- Glossy Ibis
- Glossy Swiftlet
- Goldcrest
- Golden-backed Weaver
- Golden-bellied Flycatcher
- Golden-bellied Gerygone
- Golden-billed Saltator
- Golden-breasted Bunting
- Golden-collared Macaw
- Golden-collared Manakin
- Golden-crowned Flycatcher
- Golden-crowned Spadebill
- Golden-crowned Tanager
- Golden-crowned Warbler
- Golden-faced Tyrannulet
- Golden-fronted Leafbird
- Golden-fronted Whitestart
- Golden-green Woodpecker
- Golden-headed Cisticola
- Golden-headed Manakin
- Golden-headed Quetzal
- Golden-hooded Tanager
- Golden-mantled Racket-tail
- Golden-naped Tanager
- Golden-olive Woodpecker
- Golden-plumed Parakeet
- Golden-rumped Euphonia
- Golden-tailed Woodpecker
- Golden-throated Barbet
- Golden Cuckooshrike
- Golden Eagle
- Golden Greenbul
- Golden Grosbeak
- Golden Monarch
- Golden Myna
- Golden Swallow
- Golden Tanager
- Goldenface
- Goliath Coucal
- Goliath Heron
- Gorgeous Bushshrike
- Gorgeted Sunangel
- Gorgeted Woodstar
- Grass-green Tanager
- Grass Wren
- Grassland Sparrow
- Grassland Yellow Finch
- Grauer's Swamp Warbler
- Great-billed Kingfisher
- Great-billed Mannikin
- Great-billed Parrot
- Great Antshrike
- Great Barbet
- Great Black-backed Gull
- Great Black Hawk
- Great Blue Heron
- Great Blue Turaco
- Great Bustard
- Great Cormorant
- Great Crested Grebe
- Great Egret
- Great Frigatebird
- Great Grebe
- Great Grey Owl
- Great Grey Shrike
- Great Hanging Parrot
- Great Hornbill
- Great Horned Owl
- Great Indian Bustard
- Great Jacamar
- Great Kiskadee
- Great Knot
- Great Myna
- Great Potoo
- Great Reed Warbler
- Great Shearwater
- Great Skua
- Great Slaty Woodpecker
- Great Sparrow
- Great Spotted Woodpecker
- Great Stone-curlew
- Great Thrush
- Great Tinamou
- Great Tit
- Great Tit (bokharensis)
- Great White Pelican
- Greater Adjutant
- Greater Ani
- Greater Antillean Bullfinch
- Greater Antillean Elaenia
- Greater Antillean Grackle
- Greater Bird-of-paradise
- Greater Blue-eared Starling
- Greater Crested Tern
- Greater Double-collared Sunbird
- Greater Flamingo
- Greater Green Leafbird
- Greater Hoopoe-Lark
- Greater Necklaced Laughingthrush
- Greater Racket-tailed Drongo
- Greater Rhea
- Greater Sand Plover
- Greater Scaup
- Greater Short-toed Lark
- Greater Spotted Eagle
- Greater Striped Swallow
- Greater Vasa Parrot
- Greater Wagtail-Tyrant
- Greater White-fronted Goose
- Greater Yellow Finch
- Greater Yellowlegs
- Green-and-black Fruiteater
- Green-backed Camaroptera
- Green-backed Gerygone
- Green-backed Hillstar
- Green-backed Kingfisher
- Green-backed Robin
- Green-backed Tit
- Green-barred Woodpecker
- Green-billed Malkoha
- Green-crowned Brilliant
- Green-fronted Lancebill
- Green-headed Sunbird
- Green-tailed Sunbird
- Green-tailed Warbler
- Green-throated Carib
- Green-throated Sunbird
- Green-winged Pytilia
- Green-winged Teal
- Green Avadavat
- Green Heron
- Green Honeycreeper
- Green Hylia
- Green Ibis
- Green Imperial Pigeon
- Green Kingfisher
- Green Mango
- Green Pygmy Goose
- Green Racket-tail
- Green Rosella
- Green Sandpiper
- Green Shrike-babbler
- Green Shrike-Vireo
- Green Warbler
- Green Warbler-Finch
- Green White-eye
- Green Wood Hoopoe
- Greenish Elaenia
- Greenish Warbler
- Grey-backed Camaroptera
- Grey-backed Cisticola
- Grey-backed Fiscal
- Grey-backed Shrike
- Grey-bellied Shrike-Tyrant
- Grey-breasted Martin
- Grey-breasted Mountain Toucan
- Grey-breasted Prinia
- Grey-breasted Seedsnipe
- Grey-breasted Wood Wren
- Grey-capped Pygmy Woodpecker
- Grey-capped Warbler
- Grey-cheeked Green Pigeon
- Grey-cheeked Nunlet
- Grey-chinned Sunbird
- Grey-cowled Wood Rail
- Grey-crested Cacholote
- Grey-crested Tit
- Grey-crowned Babbler
- Grey-crowned Goldfinch
- Grey-eyed Bulbul
- Grey-faced Petrel
- Grey-fronted Honeyeater
- Grey-headed Bullfinch
- Grey-headed Canary-flycatcher
- Grey-headed Chachalaca
- Grey-headed Chickadee
- Grey-headed Cuckooshrike
- Grey-headed Fish Eagle
- Grey-headed Fruit Dove
- Grey-headed Goshawk
- Grey-headed Gull
- Grey-headed Kingfisher
- Grey-headed Kite
- Grey-headed Lapwing
- Grey-headed Lovebird
- Grey-headed Mannikin
- Grey-headed Nigrita
- Grey-headed Tanager
- Grey-headed Woodpecker
- Grey-hooded Sierra Finch
- Grey-hooded Sunbird
- Grey-hooded Warbler
- Grey-lined Hawk
- Grey-necked Bunting
- Grey-rumped Treeswift
- Grey-sided Bush Warbler
- Grey-sided Flowerpecker
- Grey-streaked Flycatcher
- Grey-streaked Honeyeater
- Grey-throated Leaftosser
- Grey-throated Martin
- Grey-throated Sunbird
- Grey-winged Blackbird
- Grey-winged Francolin
- Grey Bush Chat
- Grey Butcherbird
- Grey Crow
- Grey Crowned Crane
- Grey Cuckooshrike
- Grey Falcon
- Grey Fantail
- Grey Francolin
- Grey Gerygone
- Grey Go-away-bird
- Grey Goshawk
- Grey Grasswren
- Grey Heron
- Grey Hypocolius
- Grey Imperial Pigeon
- Grey Kestrel
- Grey Kingbird
- Grey Noddy
- Grey Parrot
- Grey Partridge
- Grey Plover
- Grey Seedeater
- Grey Shrikethrush
- Grey Sunbird
- Grey Teal
- Grey Tit
- Grey Tit-Flycatcher
- Grey Wagtail
- Grey Warbler-Finch
- Grey Whistler
- Greyish Baywing
- Greyish Piculet
- Greylag Goose
- Griffon Vulture
- Groove-billed Toucanet
- Grosbeak Starling
- Ground Parrot
- Ground Woodpecker
- Guaiabero
- Guira Cuckoo
- Güldenstädt's Redstart
- Gull-billed Tern
- Gurney's Eagle
- Gurney's Sugarbird