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- Gaea: an island off the coast of Portugal in the novel The Arm of the Starfish by Madeleine L'Engle, named for the Greek "Earth Mother" goddess Gaea
- Gaea's Navel: an island in the video game Chrono Cross
- Galuga Island: setting of the video games Contra and Contra IV
- Ganae: a Caribbean island in the novel No Other Life by Brian Moore
- Genosha: from Marvel Comics
- Gengoro Island: from Dr. Slump
- Gilligan's Island
- Grand Nixon Island: from Marvel Comics
- Gravett Island, the destination of escape pods from the USS Enterprise-E starship in the movie Star Trek: First Contact.
- Great Todday (Todaidh Mór): island in the Hebrides, companion of Little Todday in the novel Whisky Galore by Compton Mackenzie
- Greatfish Isle: An island in the Nintendo Gamecube game, The Legend of Zelda: The Wind Waker.
- Gullah Gullah Island in the TV series of the same name
Read more about this topic: List Of Fictional Islands