- Gadwall
- Gartered Trogon
- Gentoo Penguin
- Giant Cowbird
- Giant Kingfisher
- Gilded Barbet
- Glaucous Gull
- Glaucous Tanager
- Glittering-throated Emerald
- Glossy-black Thrush
- Glossy Ibis
- Glossy Swiftlet
- Gold-ringed Tanager
- Golden-bellied Gerygone
- Golden-bellied Starfrontlet
- Golden-collared Manakin
- Golden-crowned Flycatcher
- Golden-fronted Whitestart
- Golden-headed Manakin
- Golden-headed Quetzal
- Golden-hooded Tanager
- Golden-naped Tanager
- Golden-naped Woodpecker
- Golden-olive Woodpecker
- Golden-tailed Sapphire
- Golden-winged Parakeet
- Golden Grosbeak
- Golden Tanager
- Goliath Heron
- Gorgeted Sunangel
- Grass Wren
- Grasshopper Buzzard
- Grassland Sparrow
- Great-billed Parrot
- Great-tailed Grackle
- Great Antshrike
- Great Black-backed Gull
- Great Black Hawk
- Great Blue Heron
- Great Cormorant
- Great Crested Grebe
- Great Curassow
- Great Egret
- Great Green Macaw
- Great Grey Shrike
- Great Horned Owl
- Great Kiskadee
- Great Spotted Woodpecker
- Great Thrush
- Great Tinamou
- Great Tit
- Great White Pelican
- Greater Ani
- Greater Blue-eared Starling
- Greater Coucal
- Greater Crested Tern
- Greater Flamingo
- Greater Flowerpiercer
- Greater Hoopoe-Lark
- Greater Rhea
- Greater Scaup
- Greater Short-toed Lark
- Greater Spotted Eagle
- Greater Yellow-headed Vulture
- Greater Yellowlegs
- Green-and-black Fruiteater
- Green-backed Camaroptera
- Green-backed Hillstar
- Green-backed Trogon
- Green-billed Malkoha
- Green-breasted Mango
- Green-crowned Brilliant
- Green-rumped Parrotlet
- Green-tailed Jacamar
- Green-throated Mango
- Green Aracari
- Green Hermit
- Green Heron
- Green Honeycreeper
- Green Ibis
- Green Kingfisher
- Green Oropendola
- Green Sandpiper
- Green Thorntail
- Green Wood Hoopoe
- Greenish Puffleg
- Grey-breasted Martin
- Grey-breasted Mountain Toucan
- Grey-breasted Wood Wren
- Grey-browed Brushfinch
- Grey-cheeked Parakeet
- Grey-cheeked Thrush
- Grey-cowled Wood Rail
- Grey-fronted Dove
- Grey-headed Chachalaca
- Grey-headed Fish Eagle
- Grey-headed Gull
- Grey-headed Kingfisher
- Grey-headed Kite
- Grey-headed Swamphen
- Grey-headed Tanager
- Grey-hooded Bush Tanager
- Grey-lined Hawk
- Grey-tailed Mountaingem
- Grey-throated Leaftosser
- Grey Catbird
- Grey Hawk
- Grey Heron
- Grey Kestrel
- Grey Kingbird
- Grey Monjita
- Grey Wagtail
- Greyish Baywing
- Greyish Piculet
- Greylag Goose
- Griffon Vulture
- Groove-billed Ani
- Guayaquil Woodpecker
- Guianan Cock-of-the-rock
- Guianan Trogon
- Guira Cuckoo
- Guira Tanager
- Gull-billed Tern