Science magazines
- Goldline Darter
- Gopher Tortoise
- Gouania Hillebrandii
- Gouania Meyenii
- Gouania Vitifolia
- Gowen Cypress
- Gray Bat
- Gray Whale
- Gray Wolf
- Green Pitcher-plant
- Green Sea Turtle
- Green-blossom Pearlymussel
- Greenback Cutthroat Trout
- Greene's Orcutt Grass
- Guadalupe Fur Seal
- Guajón
- Guam Broadbill
- Guam Micronesian Kingfisher
- Guam Rail
- Gulf Moccasinshell