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- Jambalaya Island: An ex-pirate island in the Caribbean, turned to a tourist attraction center, in Escape from Monkey Island
- Javasu: An island in the Indian Ocean, the alleged country of "Princess Caraboo"
- Jhamjarh: An Indian Maharajate in Donald Jack's Bandy Papers novels.
- Joanna: The country of Kim Larsens Danish song "Tag mig med til Joanna" about longing for a country where one can grow.
- Johto: A region in the Pokémon games Pokémon Gold and Silver, Pokémon Crystal & Pokémon HeartGold and SoulSilver.
- Jolliginki: An African kingdom in the Doctor Dolittle books
- Juanatopia: A kingdom in The Kings Love By Juan C. Moya
- Jumbostan And Unsteadystan: From the world of Donald Duck
Read more about this topic: List Of Fictional Countries