- Gadwall
- Galah
- Galápagos Sea Lion
- Gambel's Quail
- Garden Bumble Bee
- Garden Carpet
- Garden Chafer
- Garden Grass-veneer
- Garden Snail
- Garden Tiger
- Garden Tortrix
- Garden Webworm Moth
- Garganey
- Gatekeeper
- Gem Moth
- Genista Broom Moth
- Georgia Wolf Spider
- Geranium Bronze
- German Scorpionfly
- German Yellowjacket
- Giant Asian Mantis
- Giant Floater
- Giant Golden Orbweaver
- Giant Green Anemone
- Giant Honey Bee
- Giant leaf-footed bug
- Giant Leopard Moth
- Giant Peacock Moth
- Giant Toad
- Gila Woodpecker
- Girdled Snail
- Glanville Fritillary
- Glassy-winged Sharpshooter
- Glaucous Gull
- Glaucous-winged Gull
- Glittering-bellied Emerald
- Globefish
- Globular Drop Snail
- Glossy Ibis
- Goat Moth
- Goatweed Leafwing
- Gold Dust Day Gecko
- Gold-marked Thread-waisted Wasp
- Goldcrest
- Golden Dung Fly
- Golden Eagle
- Golden Jumping Spider
- Golden Northern Bumble Bee
- Golden Paper Wasp
- Golden Silk Spider
- Golden Whistler
- Golden-backed Snipe Fly
- Golden-bloomed Longhorn Beetle
- Golden-crowned Kinglet
- Golden-crowned Sparrow
- Golden-fronted Woodpecker
- Golden-ringed Dragonfly
- Goldenrod Crab Spider
- Goldenrod Gall Fly
- Goldenrod Soldier Beetle
- Goldfish
- Gooseneck Barnacle
- Gopher Snake
- Gorse Orbweaver
- Gorse Shield Bug
- Graceful Twig Ant
- Granulated Ground Beetle
- Grapeleaf Skeletonizer Moth
- Grapevine Beetle
- Grass Eggar
- Grass snake
- Grasshopper Sparrow
- Grateful Midget
- Gray Bird Grasshopper
- Gray Buckeye
- Gray Catbird
- Gray Cracker
- Gray Fox
- Gray Hairstreak
- Gray Hawk
- Gray Kingbird
- Gray Partridge
- Gray Shrikethrush
- Gray Treefrog
- Gray Wall Jumping Spider
- Gray-breasted Martin
- Gray-headed Swamphen
- Grayish Baywing
- Grayling
- Great Banded Furrow Bee
- Great Banded Grayling
- Great Barracuda
- Great Black Digger Wasp
- Great Black-backed Gull
- Great Blue Heron
- Great Blue Skimmer
- Great Cormorant
- Great Crested Flycatcher
- Great Crested Grebe
- Great Crested Tern
- Great Eggfly
- Great Egret
- Great Golden Digger Wasp
- Great Gray Shrike
- Great Green Bush-cricket
- Great Horned Owl
- Great Kiskadee
- Great Pond Snail
- Great Pondhawk
- Great Purple Hairstreak
- Great Ram's-horn
- Great Reed Warbler
- Great Southern White
- Great Spangled Fritillary
- Great Spotted Woodpecker
- Great Spreadwing
- Great Thrush
- Great Tit
- Great White Pelican
- Great-tailed Grackle
- Greater Bee Fly
- Greater Coucal
- Greater Earless Lizard
- Greater Flamingo
- Greater Roadrunner
- Greater Scaup
- Greater Short-horned Lizard
- Greater White-fronted Goose
- Greater Whitethroat
- Greater Yellowlegs
- Green Anole
- Green Carpet
- Green Cloverworm Moth
- Green Comma
- Green Cone-headed Planthopper
- Green Cutworm Moth
- Green Dock Beetle
- Green Hairstreak
- Green Heron
- Green Huntsman Spider
- Green Iguana
- Green Immigrant Leaf Weevil
- Green Jay
- Green Kingfisher
- Green Leafhopper
- Green Leuconycta Moth
- Green Lizard
- Green Longhorn Moth
- Green Lynx Spider
- Green Pug
- Green Sandpiper
- Green Shield Bug
- Green Silver-lines
- Green Stink Bug
- Green Sunfish
- Green Tiger Beetle
- Green Toad
- Green Tree Frog
- Green Treefrog
- Green Whip Snake
- Green-barred Woodpecker
- Green-striped Grasshopper
- Green-tailed Towhee
- Green-veined White
- Green-winged Teal
- Greenhouse Frog
- Greenhouse Millipede
- Greenish Blue
- Grey Butcherbird
- Grey Cross Spider
- Grey Fantail
- Grey Heron
- Grey Pansy
- Grey Seal
- Grey Teal
- Grey Wagtail
- Grey-headed Flying-fox
- Grey-headed Woodpecker
- Greylag Goose
- Grizzled Skipper
- Groove-billed Ani
- Groundhog
- Guinea Paper Wasp
- Guira Cuckoo
- Gulf Coast Toad
- Gulf Fritillary
- Gull-billed Tern
- Gumboot Chiton