- Garden Warbler
- Gartered Trogon
- Giant Cowbird
- Giant Kingfisher
- Glittering-throated Emerald
- Glossy-black Thrush
- Glossy Ibis
- Glowing Puffleg
- Golden-backed Weaver
- Golden-bellied Flycatcher
- Golden-breasted Bunting
- Golden-collared Macaw
- Golden-collared Manakin
- Golden-crowned Warbler
- Golden-faced Tyrannulet
- Golden-fronted Whitestart
- Golden-headed Manakin
- Golden-headed Quetzal
- Golden-hooded Tanager
- Golden-naped Tanager
- Golden-olive Woodpecker
- Golden-plumed Parakeet
- Golden Grosbeak
- Golden Tanager
- Goliath Heron
- Gosling's Bunting
- Grass-green Tanager
- Grasshopper Buzzard
- Grassland Sparrow
- Great Antshrike
- Great Black Hawk
- Great Blue Turaco
- Great Cormorant
- Great Cormorant (lucidus)
- Great Crested Flycatcher
- Great Egret
- Great Grey Shrike
- Great Kiskadee
- Great Potoo
- Great Rufous Woodcreeper
- Great Spotted Cuckoo
- Great Spotted Woodpecker
- Great Thrush
- Great Tit
- Great White Pelican
- Greater Blue-eared Starling
- Greater Flamingo
- Greater Honeyguide
- Greater Rhea
- Greater Swamp Warbler
- Greater Thornbird
- Greater Yellowlegs
- Green-and-black Fruiteater
- Green-backed Becard
- Green-backed Trogon
- Green-barred Woodpecker
- Green-crowned Brilliant
- Green-fronted Lancebill
- Green-headed Sunbird
- Green-tailed Goldenthroat
- Green-tailed Jacamar
- Green Hermit
- Green Heron
- Green Honeycreeper
- Green Ibis
- Green Sandpiper
- Green Thorntail
- Green White-eye
- Green Wood Hoopoe
- Grey-backed Camaroptera
- Grey-backed Fiscal
- Grey-breasted Martin
- Grey-breasted Wood Wren
- Grey-browed Brushfinch
- Grey-capped Warbler
- Grey-cowled Wood Rail
- Grey-crested Cacholote
- Grey-headed Bushshrike
- Grey-headed Dove
- Grey-headed Gull
- Grey-headed Kingfisher
- Grey-headed Nigrita
- Grey-headed Tanager
- Grey-hooded Bush Tanager
- Grey Crowned Crane
- Grey Cuckooshrike
- Grey Heron
- Grey Kestrel
- Grey Monjita
- Grey Parrot
- Grey Plover
- Grey Seedeater
- Grey Wren-Warbler
- Greyish Baywing
- Groove-billed Ani
- Guayaquil Woodpecker
- Guira Cuckoo
- Gull-billed Tern