| Magpie-lark Grallina cyanoleuca | Passeriformes / Monarchidae | LC |
| Indian Grassbird Graminicola bengalensis | Passeriformes / Pellorneidae | NT |
| Rose-bellied Chat Granatellus paraensis | Passeriformes / Cardinalidae | LC |
| Rose-breasted Chat Granatellus pelzelni | Passeriformes / Cardinalidae | LC |
| Grey-throated Chat Granatellus sallaei | Passeriformes / Cardinalidae | LC |
| Red-breasted Chat Granatellus venustus | Passeriformes / Cardinalidae | NE |
| Violet-eared Waxbill Granatina granatina | Passeriformes / Estrildidae | LC |
| Purple Grenadier Granatina ianthinogaster | Passeriformes / Estrildidae | LC |
| Painted Honeyeater Grantiella picta | Passeriformes / Meliphagidae | LC |
| Grauer's Warbler Graueria vittata | Passeriformes / Acrocephalidae | LC |
| Short-tailed Parrot Graydidascalus brachyurus | Psittaciformes / Psittacidae | LC |
| Whooping Crane Grus americana | Gruiformes / Gruidae | EN |
| Wattled Crane Grus carunculata | Gruiformes / Gruidae | VU |
| Blue Crane Grus paradisea | Gruiformes / Gruidae | VU |
| Guadalcanal Honeyeater Guadalcanaria inexpectata | Passeriformes / Meliphagidae | LC |
| Golden Parakeet Guaruba guarouba | Psittaciformes / Psittacidae | VU |
| Yellow Cardinal Gubernatrix cristata | Passeriformes / Thraupidae | EN |
| Streamer-tailed Tyrant Gubernetes yetapa | Passeriformes / Tyrannidae | LC |
| Guira Cuckoo Guira guira | Cuculiformes / Cuculidae | LC |
| European Shag Gulosus aristotelis | Suliformes / Phalacrocoracidae | LC |
| Southern Crested Guineafowl Guttera edouardi | Galliformes / Numididae | LC |
| Plumed Guineafowl Guttera plumifera | Galliformes / Numididae | LC |
| Eastern Crested Guineafowl Guttera pucherani | Galliformes / Numididae | LC |
| Western Crested Guineafowl Guttera verreauxi | Galliformes / Numididae | LC |
| Chapada Flycatcher Guyramemua affine | Passeriformes / Tyrannidae | NT |
| Puerto Rican Owl Gymnasio nudipes | Strigiformes / Strigidae | LC |
| Grey-throated Barbet Gymnobucco bonapartei | Piciformes / Lybiidae | NE |
| Naked-faced Barbet Gymnobucco calvus | Piciformes / Lybiidae | NE |
| Bristle-nosed Barbet Gymnobucco peli | Piciformes / Lybiidae | LC |
| Sladen's Barbet Gymnobucco sladeni | Piciformes / Lybiidae | LC |
| Bare-crowned Antbird Gymnocichla nudiceps | Passeriformes / Thamnophilidae | LC |
| Bare-eyed Rail Gymnocrex plumbeiventris | Gruiformes / Rallidae | LC |
| Blue-faced Rail Gymnocrex rosenbergii | Gruiformes / Rallidae | VU |
| Talaud Rail Gymnocrex talaudensis | Gruiformes / Rallidae | EN |
| Bare-necked Fruitcrow Gymnoderus foetidus | Passeriformes / Cotingidae | LC |
| California Condor Gymnogyps californianus | Cathartiformes / Cathartidae | CR |
| Oriole Blackbird Gymnomystax mexicanus | Passeriformes / Icteridae | LC |
| Crow Honeyeater Gymnomyza aubryana | Passeriformes / Meliphagidae | CR |
| Duetting Giant Honeyeater Gymnomyza brunneirostris | Passeriformes / Meliphagidae | LC |
| Mao Gymnomyza samoensis | Passeriformes / Meliphagidae | EN |
| Yellow-billed Giant Honeyeater Gymnomyza viridis | Passeriformes / Meliphagidae | LC |
| Papuan Mountain Pigeon Gymnophaps albertisii | Columbiformes / Columbidae | LC |
| Buru Mountain Pigeon Gymnophaps mada | Columbiformes / Columbidae | LC |
| Pale Mountain Pigeon Gymnophaps solomonensis | Columbiformes / Columbidae | LC |
| Seram Mountain Pigeon Gymnophaps stalkeri | Columbiformes / Columbidae | LC |
| Bicolored Antbird Gymnopithys bicolor | Passeriformes / Thamnophilidae | LC |
| White-cheeked Antbird Gymnopithys leucaspis | Passeriformes / Thamnophilidae | LC |
| Rufous-throated Antbird Gymnopithys rufigula | Passeriformes / Thamnophilidae | LC |
| Australian Magpie Gymnorhina tibicen | Passeriformes / Artamidae | LC |
| Pinyon Jay Gymnorhinus cyanocephalus | Passeriformes / Corvidae | VU |