- Gadwall
- Giant Cowbird
- Glittering-throated Emerald
- Golden-collared Macaw
- Golden-collared Woodpecker
- Golden-crowned Warbler
- Golden-green Woodpecker
- Golden-headed Manakin
- Golden-olive Woodpecker
- Golden-sided Euphonia
- Golden-spangled Piculet
- Golden-winged Parakeet
- Graceful Prinia
- Grassland Sparrow
- Great-billed Hermit
- Great Antshrike
- Great Black Hawk
- Great Cormorant
- Great Crested Grebe
- Great Egret
- Great Horned Owl
- Great Jacamar
- Great Kiskadee
- Great Potoo
- Great Spotted Woodpecker
- Great Tit
- Greater Ani
- Greater Rhea
- Greater Scaup
- Greater Yellow-headed Vulture
- Greater Yellowlegs
- Green-backed Trogon
- Green-cheeked Parakeet
- Green-headed Sunbird
- Green-headed Tanager
- Green-rumped Parrotlet
- Green-tailed Jacamar
- Green-throated Mango
- Green Aracari
- Green Honeycreeper
- Green Ibis
- Green Kingfisher
- Green Oropendola
- Grey-breasted Martin
- Grey-breasted Sabrewing
- Grey-crowned Flatbill
- Grey-fronted Dove
- Grey-lined Hawk
- Grey-necked Wood Rail
- Grey-winged Trumpeter
- Grey Antbird
- Grey Antwren
- Grey Heron
- Grey Kingbird
- Grey Plover
- Greyish Mourner
- Greyish Saltator
- Greylag Goose
- Guianan Cock-of-the-rock
- Guianan Puffbird
- Guianan Red Cotinga
- Guianan Schiffornis
- Guianan Streaked Antwren
- Guianan Toucanet
- Guianan Tyrannulet
- Guianan Warbling Antbird
- Guira Cuckoo
- Gull-billed Tern