- Gadwall
- Garden Warbler
- Garganey
- Gartered Trogon
- Giant Antpitta
- Giant Hummingbird
- Giant Kingfisher
- Glossy-black Thrush
- Glossy Ibis
- Goldcrest
- Golden-crowned Flycatcher
- Golden-headed Quetzal
- Golden-hooded Tanager
- Golden-naped Tanager
- Golden-naped Woodpecker
- Golden-olive Woodpecker
- Golden Grosbeak
- Golden Tanager
- Goliath Heron
- Gorgeted Sunangel
- Gorgeted Woodstar
- Grasshopper Buzzard
- Great-tailed Grackle
- Great Antshrike
- Great Black-backed Gull
- Great Blue Heron
- Great Cormorant
- Great Crested Grebe
- Great Curassow
- Great Egret
- Great Frigatebird
- Great Grey Owl
- Great Grey Shrike
- Great Kiskadee
- Great Potoo
- Great Reed Warbler
- Great Rufous Woodcreeper
- Great Spotted Cuckoo
- Great Spotted Woodpecker
- Great Tit
- Great White Pelican
- Greater Blue-eared Starling
- Greater Coucal
- Greater Crested Tern
- Greater Double-collared Sunbird
- Greater Flamingo
- Greater Painted-snipe
- Greater Racket-tailed Drongo
- Greater Rhea
- Greater Striped Swallow
- Greater Thornbird
- Greater White-fronted Goose
- Green-crowned Brilliant
- Green Heron
- Green Honeycreeper
- Green Ibis
- Green Kingfisher
- Green Sandpiper
- Green Thorntail
- Green Wood Hoopoe
- Grey-backed Camaroptera
- Grey-backed Fiscal
- Grey-breasted Martin
- Grey-breasted Wood Wren
- Grey-cowled Wood Rail
- Grey-crested Cacholote
- Grey-headed Chachalaca
- Grey-headed Gull
- Grey-headed Kingfisher
- Grey Crowned Crane
- Grey Francolin
- Grey Go-away-bird
- Grey Hawk
- Grey Heron
- Grey Kestrel
- Grey Kingbird
- Grey Partridge
- Grey Plover
- Grey Tit
- Grey Wagtail
- Grey Waxbill
- Greyish Baywing
- Greylag Goose
- Griffon Vulture
- Groove-billed Ani
- Ground Woodpecker
- Guayaquil Woodpecker
- Guira Cuckoo
- Gull-billed Tern
- Gurney's Sugarbird
- Gyrfalcon