C
- C Island: from the Nintendo game StarTropics
- Cactuar Island: from Final Fantasy VII and Final Fantasy VIII
- Candy Apple Island: The Simpsons
- Candied Island: The Marvelous Misadventures of Flapjack
- Caprona, a.k.a. Caspak: from The Land That Time Forgot and its sequels
- Carlotta: small island off the coast of Peru in the movie The Bribe, reused to comic effect in Dead Men Don't Wear Plaid
- Caspiar: fictional island nation home of Andy Kaufman's character Latka. It sank.
- Cascara: main setting of the film Water
- Castaway Island: where the castaways live in Pirate Islands
- Chausible Island: from the novel The New Paul and Virginia
- Cinnabar Island: The site of the seventh Gym in the Nintendo Game Boy game, Pokémon Red and Blue.
- Clanbronwyn: a small island off the coast of Anglesey in the adventure game Trilby's Notes
- Coral Island: from the boy's book by R. M. Ballantyne
- Coral Island: from the cartoon The Smoggies
- Corto Maltese: from Batman: The Dark Knight Returns comics
- Costa Estralita: from the film Princess Protection Program
- Costa Luna: from the film Princess Protection Program
- Crab Island: poor Caribbean island shaped like a crab, under the domination of Crocodile Island, in the Patrouille des Castors comics
- Crab Island: an island in the Caribbean Sea, from the children's novel Peter Duck by Arthur Ransome
- Crab Key: Dr. No's hideout in the first James Bond movie.
- Craggy Island (off the coast of Ireland): setting of sitcom Father Ted
- Crescent Island: a crescent-shaped island in the video game Final Fantasy IV
- Crocodile Island: Caribbean island shaped like a crocodile, with a dictatorial government which seems to be heavily influenced by Tahiti, in the Patrouille des Castors comics
- Crusoeland: another name for Atoll K
Read more about this topic: List Of Fictional Islands