- Gadwall
- Galapagos Dove
- Galapagos Flycatcher
- Galapagos Hawk
- Galapagos Mockingbird
- Galapagos Penguin
- Gartered Trogon
- Giant Coot
- Giant Kingfisher
- Glaucous-winged Gull
- Glaucous Gull
- Glossy Ibis
- Goldcrest
- Golden-billed Saltator
- Golden-breasted Bunting
- Golden-browed Chlorophonia
- Golden-collared Manakin
- Golden-fronted Woodpecker
- Golden-hooded Tanager
- Golden-spotted Ground Dove
- Golden-winged Sunbird
- Goliath Heron
- Grasshopper Buzzard
- Great-tailed Grackle
- Great Black-backed Gull
- Great Blue Heron
- Great Blue Turaco
- Great Bustard
- Great Cormorant
- Great Crested Grebe
- Great Curassow
- Great Egret
- Great Frigatebird
- Great Grebe
- Great Hornbill
- Great Kiskadee
- Great Lizard Cuckoo
- Great Reed Warbler
- Great Spotted Cuckoo
- Great Spotted Woodpecker
- Great Thrush
- Great Tit
- Great White Pelican
- Greater Antillean Grackle
- Greater Blue-eared Starling
- Greater Coucal
- Greater Crested Tern
- Greater Double-collared Sunbird
- Greater Flamingo
- Greater Racket-tailed Drongo
- Greater Scaup
- Greater White-fronted Goose
- Greater Yellow-headed Vulture
- Greater Yellowlegs
- Green-and-white Hummingbird
- Green-backed Camaroptera
- Green-crowned Brilliant
- Green-headed Sunbird
- Green-tailed Sunbird
- Green-throated Carib
- Green-winged Teal
- Green Heron
- Green Ibis
- Green Imperial Pigeon
- Green Kingfisher
- Green Sandpiper
- Green Wood Hoopoe
- Grey-backed Camaroptera
- Grey-backed Fiscal
- Grey-breasted Martin
- Grey-breasted Seedsnipe
- Grey-breasted Wood Wren
- Grey-capped Pygmy Woodpecker
- Grey-capped Social Weaver
- Grey-chested Dove
- Grey-chinned Minivet
- Grey-cowled Wood Rail
- Grey-crowned Rosy Finch
- Grey-crowned Yellowthroat
- Grey-flanked Cinclodes
- Grey-headed Chachalaca
- Grey-headed Gull
- Grey-headed Kingfisher
- Grey-headed Lovebird
- Grey-headed Swamphen
- Grey-headed Tanager
- Grey-headed Woodpecker
- Grey-hooded Sierra Finch
- Grey-throated Babbler
- Grey-throated Barbet
- Grey Catbird
- Grey Crowned Crane
- Grey Francolin
- Grey Gerygone
- Grey Go-away-bird
- Grey Gull
- Grey Heron
- Grey Kingbird
- Grey Plover
- Grey Teal
- Grey Wagtail
- Grey Warbler-Finch
- Greyish Baywing
- Greyish Eagle-Owl
- Greylag Goose
- Griffon Vulture
- Groove-billed Ani
- Groundscraper Thrush
- Guadeloupe Woodpecker
- Guanay Cormorant
- Guatemalan Tyrannulet
- Gull-billed Tern