- Gabar Goshawk
- Giant Coot
- Giant Cowbird
- Giant Hummingbird
- Giant Kingfisher
- Giant Snipe
- Giant Wood Rail
- Gilded Barbet
- Gilded Sapphire
- Gilt-edged Tanager
- Glacier Finch
- Glaucous Tanager
- Glistening-green Tanager
- Glittering-bellied Emerald
- Glittering-throated Emerald
- Glossy Ibis
- Glowing Puffleg
- Gold-ringed Tanager
- Golden-billed Saltator
- Golden-breasted Bunting
- Golden-capped Parakeet
- Golden-chevroned Tanager
- Golden-collared Macaw
- Golden-crowned Warbler
- Golden-eared Tanager
- Golden-faced Tyrannulet
- Golden-green Woodpecker
- Golden-naped Tanager
- Golden-olive Woodpecker
- Golden-tailed Woodpecker
- Golden Tanager
- Goliath Heron
- Grass Wren
- Grassland Sparrow
- Great-billed Hermit
- Great-tailed Grackle
- Great Antshrike
- Great Black-backed Gull
- Great Black Hawk
- Great Cormorant (lucidus)
- Great Crested Grebe
- Great Egret
- Great Frigatebird
- Great Grebe
- Great Horned Owl
- Great Kiskadee
- Great Potoo
- Great Rufous Woodcreeper
- Great Sapphirewing
- Great Thrush
- Great White Pelican
- Greater Ani
- Greater Blue-eared Starling
- Greater Crested Tern
- Greater Double-collared Sunbird
- Greater Flamingo
- Greater Kestrel
- Greater Painted-snipe
- Greater Rhea
- Greater Thornbird
- Greater Wagtail-Tyrant
- Greater Yellowlegs
- Green-and-black Fruiteater
- Green-backed Trogon
- Green-barred Woodpecker
- Green-cheeked Parakeet
- Green-crowned Brilliant
- Green-fronted Lancebill
- Green-headed Tanager
- Green-rumped Parrotlet
- Green-winged Pytilia
- Green-winged Saltator
- Green Honeycreeper
- Green Ibis
- Green Kingfisher
- Green Thorntail
- Green Wood Hoopoe
- Greenish Puffleg
- Greenish Schiffornis
- Greenish Yellow Finch
- Grey-and-gold Tanager
- Grey-backed Camaroptera
- Grey-backed Sparrow-Lark
- Grey-backed Tachuri
- Grey-bellied Flowerpiercer
- Grey-bellied Shrike-Tyrant
- Grey-bellied Spinetail
- Grey-breasted Sabrewing
- Grey-capped Tyrannulet
- Grey-cowled Wood Rail
- Grey-crested Cacholote
- Grey-crested Finch
- Grey-fronted Dove
- Grey-headed Bushshrike
- Grey-headed Elaenia
- Grey-headed Gull
- Grey-headed Tanager
- Grey-hooded Attila
- Grey-hooded Flycatcher
- Grey-hooded Parakeet
- Grey-hooded Sierra Finch
- Grey-rumped Swallow
- Grey-throated Leaftosser
- Grey Crowned Crane
- Grey Go-away-bird
- Grey Gull
- Grey Heron
- Grey Monjita
- Grey Pileated Finch
- Grey Plover
- Grey Seedeater
- Greyish Baywing
- Greyish Mourner
- Greyish Piculet
- Ground Woodpecker
- Groundscraper Thrush
- Guanay Cormorant
- Guira Cuckoo
- Guira Tanager
- Gurney's Sugarbird