G
- Galago rondoensis — Rondo Dwarf Galago
- Galaxias fontanus — Swan galaxias
- Galaxias fuscus — Barred galaxias
- Galaxias johnstoni — Clarence galaxias
- Galaxias pedderensis — Pedder galaxias
- Galidictis grandidieri — Giant-striped Mongoose
- Gallicolumba crinigera — Mindanao Bleeding-heart
- Gallicolumba erythroptera — Polynesian Ground-dove
- Gallicolumba hoedtii — Wetar Ground-dove
- Gallicolumba keayi — Negros Bleeding-heart
- Gallicolumba menagei — Sulu Bleeding-heart
- Gallicolumba platenae — Mindoro Bleeding-heart
- Gallicolumba rubescens — Marquesan Ground-dove
- Gallicolumba sanctaecrucis — Santa Cruz Ground-dove
- Gallinula pacifica — Samoan Moorhen
- Gallinula silvestris — Makira Moorhen
- Gallirallus lafresnayanus — New Caledonian Rail
- Gallirallus okinawae — Okinawa Rail
- Gallirallus sylvestris — Lord Howe Woodhen
- Gallotia bravoana — La Gomera Giant Lizard
- Gallotia intermedia — Tenerife Speckled Lizard
- Gallotia simonyi — El Hierro Giant Lizard, Hierro Giant Lizard
- Gambelia sila — Blunt-nosed Leopard Lizard, San Joaquin Leopard Lizard
- Gambusia eurystoma — Guayacon Bocon
- Gammarus acherondytes — Illinois Cave Amphipod
- Gammarus desperatus — Noel's Amphipod
- Garra ghorensis
- Garrulax cachinnans — Rufous-breasted Laughingthrush
- Garrulax yersini — Collared Laughingthrush
- Gastrotheca bufona
- Gastrotheca christiani
- Gastrotheca espeletia
- Gastrotheca lauzuricae
- Gastrotheca litonedis
- Gastrotheca orophylax
- Gastrotheca ovifera
- Gastrotheca pseustes
- Gastrotheca psychrophila
- Gastrotheca riobambae
- Gastrotheca ruizi
- Gastrotheca splendens
- Gastrotheca stictopleura
- Gastrotheca trachyceps
- Gastrotheca zeugocystis
- Gavialis gangeticus — Fish-eating Crocodile, Gavial, Gharial, Long-nosed Crocodile
- Gazella cuvieri — Cuvier's Gazelle, Edmi Gazelle, Idmi
- Gazella dama — Addra Gazelle, Dama Gazelle
- Gazella leptoceros — Rhim Gazelle, Sand Gazelle, Slender-horned Gazelle
- Genetta cristata — Crested Genet
- Geobatrachus walkeri
- Geochelone platynota — Burmese Star Tortoise, Flatback Tortoise
- Geochelone yniphora — Angonoka, Madagascar Angulated Tortoise, Madagascar Tortoise
- Geocrinia alba — White-bellied Frog
- Geoemyda japonica — Ryukyu Black-breasted Leaf Turtle, Ryukyu Leaf Turtle
- Geoemyda silvatica — Cane Turtle, Cochin Forest Cane Turtle, Kavalai Forest Turtle
- Geoemyda spengleri — Black-breasted Hill Turtle, Black-breasted Leaf Turtle
- Geomitra coronata
- Geomitra delphinuloides
- Geomitra moniziana — Madeiran land snail
- Geomitra tiarella
- Geothlypis beldingi — Belding's Yellowthroat
- Geothlypis speciosa — Black-polled Yellowthroat
- Geotrygon carrikeri — Tuxtla Quail-dove
- Geronticus eremita — Northern Bald Ibis
- Gerygone hypoxantha — Biak Gerygone
- Gila elegans — Bonytail chub
- Gila modesta — Charalito Saltillo
- Gila nigrescens — Charalito Chihuahua
- Girardinichthys viviparus — Mexclapique
- Glaucis dohrnii — Hook-billed Hermit
- Glirulus japonicus — Japanese Dormouse
- Glischropus javanus — Javan Thick-thumbed Bat
- Globonautes macropus — Tree Hole Crab
- Glossolepis wanamensis — Lake Wanam rainbowfish
- Glyphis gangeticus — Ganges Shark
- Glyphis glyphis — Speartooth shark
- Glyphis sp. nov. A — Bizant River Shark
- Glyphis sp. nov. C — New Guinea river shark, Northern river shark
- Glyptophysa petiti
- Glyptorhagada silveri
- Gobio benacensis
- Gomphidia pearsoni
- Gomphus lynnae — Columbia Clubtail
- Gomphus sandrius — Tennessee Clubtail
- Gonepteryx maderensis
- Gonospira deshayesi
- Gonospira duponti
- Gonospira uvula
- Gonyostomus gonyostomus
- Gorilla beringei — Eastern Gorilla, Mountain Gorilla
- Gorilla gorilla — Gorilla, Western Gorilla
- Gorsachius goisagi — Japanese Night-heron
- Gorsachius magnificus — White-eared Night-heron
- Gracilinanus aceramarcae — Aceramarca Gracile Mouse Opossum, Bolivian Gracile Opossum
- Grallaria chthonia — Táchira Antpitta
- Grallaria milleri — Brown-banded Antpitta
- Grallaria ridgelyi — Jocotoco Antpitta
- Grallaricula ochraceifrons — Ochre-fronted Antpitta
- Grammomys gigas — Giant Thicket Rat
- Grandisonia brevis
- Graphium levassori
- Graphium sandawanum — Apo Swallowtail
- Graptemys flavimaculata — Yellow Blotched Sawback, Yellow-blotched Map Turtle
- Graptemys oculifera — Ringed Map Turtle, Ringed Sawback
- Graptodytes delectus
- Graziana klazenfurtensis
- Grus americana — Whooping Crane
- Grus japonensis — Red-crowned Crane
- Grus leucogeranus — Siberian Crane
- Guaruba guarouba — Golden Parakeet
- Gubernatrix cristata — Yellow Cardinal
- Gulella antelmeana
- Gulella aprosdoketa
- Gulella claustralis
- Gulella puzeyi
- Gulella salpinx
- Gulella taitensis
- Gulella thomasseti
- Gulickia alexandri
- Gymnobelideus leadbeateri — Leadbeater's Possum
- Gymnocharacinus bergii — Naked characin
- Gymnocrex talaudensis — Talaud Rail
- Gymnogyps californianus — California Condor
- Gymnomyza aubryana — Crow Honeyeater
- Gymnomyza samoensis — Mao
- Gyps bengalensis — White-rumped Vulture
- Gyps indicus — Indian Vulture
- Gyps tenuirostris — Slender-billed Vulture
- Gyraulus cockburni
- Gyrinophilus gulolineatus — Berry Cave Salamander
- Gyrinophilus subterraneus — West Virginia Spring Salamander
Read more about this topic: IUCN Red List Endangered Animal Species