- Gadwall
- Galah
- Gambel's Quail
- Gang-gang Cockatoo
- Garden Warbler
- Garganey
- Garnet-throated Hummingbird
- Garnet Pitta
- Gartered Trogon
- Giant Pitta
- Glaucous Gull
- Glossy-mantled Manucode
- Glossy Black Cockatoo
- Glossy Ibis
- Golden-collared Toucanet
- Golden-fronted Leafbird
- Golden-headed Quetzal
- Golden-mantled Racket-tail
- Golden-shouldered Parrot
- Golden-throated Barbet
- Golden Eagle
- Golden Myna
- Gorgeted Wood Quail
- Gould's Shortwing
- Gould's Toucanet
- Graceful Pitta
- Grandala
- Great-billed Heron
- Great-billed Mannikin
- Great Argus
- Great Auk
- Great Black-backed Gull
- Great Bustard
- Great Cormorant
- Great Crested Grebe
- Great Eared Nightjar
- Great Egret
- Great Grey Owl
- Great Grey Shrike
- Great Parrotbill
- Great Reed Warbler
- Great Rosefinch
- Great Sapphirewing
- Great Skua
- Great Snipe
- Great Spotted Cuckoo
- Great White Pelican
- Great Woodswallow
- Greater Flamingo
- Greater Green Leafbird
- Greater Necklaced Laughingthrush
- Greater Scaup
- Greater Short-toed Lark
- Greater Sooty Owl
- Greater Spotted Eagle
- Greater White-fronted Goose
- Greater Yellownape
- Green-backed Gerygone
- Green-backed Honeyeater
- Green-backed Robin
- Green-backed Tit
- Green-breasted Mango
- Green-fronted Hummingbird
- Green-tailed Emerald
- Green-throated Carib
- Green Aracari
- Green Cochoa
- Green Oriole
- Green Rosella
- Green Sandpiper
- Green Shrike-babbler
- Grey-and-buff Woodpecker
- Grey-backed Storm Petrel
- Grey-bellied Tesia
- Grey-breasted Mountain Toucan
- Grey-capped Pygmy Woodpecker
- Grey-chinned Minivet
- Grey-crested Tit
- Grey-crowned Babbler
- Grey-green Scrubwren
- Grey-headed Bullfinch
- Grey-headed Cuckooshrike
- Grey-headed Parrotbill
- Grey-headed Woodpecker
- Grey-necked Bunting
- Grey-rumped Treeswift
- Grey-winged Blackbird
- Grey Butcherbird
- Grey Currawong
- Grey Falcon
- Grey Goshawk
- Grey Heron
- Grey Junglefowl
- Grey Partridge
- Grey Petrel
- Grey Plover
- Grey Wagtail
- Grey Whistler
- Greylag Goose
- Groove-billed Toucanet
- Ground Cuckooshrike
- Ground Parrot
- Ground Tit
- Guianan Toucanet
- Guianan Trogon
- Güldenstädt's Redstart
- Gull-billed Tern
- Gurney's Pitta
- Gyrfalcon