- Gadwall
- Galapagos Dove
- Galapagos Flycatcher
- Galapagos Hawk
- Galapagos Mockingbird
- Galapagos Penguin
- Galapagos Shearwater
- Garden Warbler
- Garganey
- Garnet-throated Hummingbird
- Gentoo Penguin
- Geoffroy's Daggerbill
- Giant Conebill
- Giant Hummingbird
- Gilded Barbet
- Gilded Sapphire
- Glacier Finch
- Glaucous Gull
- Glittering-bellied Emerald
- Glossy-black Thrush
- Glossy Flowerpiercer
- Glossy Ibis
- Glowing Puffleg
- Goldcrest
- Golden-billed Saltator
- Golden-breasted Puffleg
- Golden-collared Tanager
- Golden-crowned Flycatcher
- Golden-crowned Tanager
- Golden-crowned Warbler
- Golden-faced Tyrannulet
- Golden-fronted Woodpecker
- Golden-green Woodpecker
- Golden-headed Quetzal
- Golden-hooded Tanager
- Golden-naped Woodpecker
- Golden-olive Woodpecker
- Golden-tailed Sapphire
- Golden-winged Manakin
- Golden-winged Warbler
- Golden Eagle
- Golden Grosbeak
- Golden Tanager
- Gorgeted Sunangel
- Gould's Jewelfront
- Grass-green Tanager
- Grass Wren
- Grassland Sparrow
- Great-billed Hermit
- Great-tailed Grackle
- Great Antshrike
- Great Black-backed Gull
- Great Black Hawk
- Great Bustard
- Great Cormorant
- Great Crested Grebe
- Great Egret
- Great Frigatebird
- Great Grebe
- Great Grey Owl
- Great Grey Shrike
- Great Horned Owl
- Great Kiskadee
- Great Potoo
- Great Reed Warbler
- Great Rosefinch
- Great Sapphirewing
- Great Shearwater
- Great Skua
- Great Spotted Cuckoo
- Great Spotted Woodpecker
- Great Thrush
- Great Tinamou
- Great Tit
- Great White Pelican
- Greater Ani
- Greater Flamingo
- Greater Rhea
- Greater Scaup
- Greater Short-toed Lark
- Greater Thornbird
- Greater Wagtail-Tyrant
- Greater White-fronted Goose
- Greater Yellow-headed Vulture
- Greater Yellow Finch
- Green-and-black Fruiteater
- Green-and-rufous Kingfisher
- Green-and-white Hummingbird
- Green-backed Firecrown
- Green-backed Trogon
- Green-barred Woodpecker
- Green-breasted Mango
- Green-cheeked Parakeet
- Green-crowned Brilliant
- Green-fronted Lancebill
- Green-tailed Trainbearer
- Green-throated Mountaingem
- Green-winged Saltator
- Green Hermit
- Green Heron
- Green Honeycreeper
- Green Ibis
- Green Jay
- Green Kingfisher
- Green Sandpiper
- Green Shrike-Vireo
- Green Thorntail
- Green Warbler-Finch
- Greenish Yellow Finch
- Grey-and-white Tyrannulet
- Grey-backed Storm Petrel
- Grey-bellied Comet
- Grey-breasted Mountain Toucan
- Grey-breasted Sabrewing
- Grey-breasted Seedsnipe
- Grey-breasted Wood Wren
- Grey-browed Brushfinch
- Grey-capped Flycatcher
- Grey-cowled Wood Rail
- Grey-crested Finch
- Grey-eared Brushfinch
- Grey-flanked Cinclodes
- Grey-fronted Dove
- Grey-headed Chachalaca
- Grey-headed Chickadee
- Grey-headed Gull
- Grey-headed Woodpecker
- Grey-hooded Parakeet
- Grey-hooded Sierra Finch
- Grey-rumped Swift
- Grey Catbird
- Grey Gull
- Grey Heron
- Grey Partridge
- Grey Plover
- Grey Wagtail
- Greyish Baywing
- Greylag Goose
- Griffon Vulture
- Groove-billed Ani
- Guanay Cormorant
- Guatemalan Pygmy Owl
- Guayaquil Woodpecker
- Guira Cuckoo
- Gull-billed Tern
- Gyrfalcon