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- Idris: a small country located between Germany and France in the Mortal Instruments novels by Cassandra Clare. Home to the magic-using Shadowhunters, and concealed from normal humans.
- Ifuvania or Ithuvania: Eastern European country used as an experiment in Gary Larson's The Far Side comic
- Illyria: Eastern European country in the play Les Mains Sales (Dirty Hands) by Jean-Paul Sartre. Illyria is also the ancient name for the region between the Adriatic Sea and the Danube.
- Imara: an African country in the 2007 series Bionic Woman.
- Inagua: a Caribbean island nation in the Franco-Belgian comic Buck Danny. Hostile to both the United States and the Soviet Union, its dictator tries to orchestrate a third World War between the two superpowers.
- Ingunaguay: a (presumably Latin American) state in the TV series The Replacements.
- Irania: a small European kingdom from the film Trouble for Two
- Iraqistan: Middle-Eastern country seen in the introduction to Have I Got News for You. A combination of Iraq and Afghanistan, the two countries invaded in the War on Terror.
- Iriadeska: South-East Asian country resembling Thailand in Frederik Pohl's short story Iriadeska's Martians
- Ishkebar: a small island monarchy, resembling Sri Lanka, between India and Thailand from The Suite Life of Zack & Cody TV series, episode "Boston Holiday"
- Ishmaelia: an African state, the setting for the novel Scoop by Evelyn Waugh.
- Ishtar: a Middle Eastern emirate in the film Ishtar
- Isla: a fictional Caribbean dictatorship in the animated series American Dad.
- Isla Cruces: an abandoned island in the film Pirates of the Caribbean: Dead Man's Chest.
- Isla de Muerta: an abandoned island in the film Pirates of the Caribbean: The Curse of the Black Pearl. It also appears in the video game Kingdom Hearts II.
- Isle of Naboombu: kingdom of anthropomorphic animals in the Disney film Bedknobs and Broomsticks
- Islandia: self-isolated country in Austin Tappan Wright's novel Islandia (Note: Islandia is the Spanish name of Iceland)
- Isle of Fogg: The only one of the 23 (fictitious) Outcropp Islands off the west coast of Scotland to be inhabited. It features in San Sombrèro: A Land of Carnivals, Cocktails and Coups.
- Istan: an island state in the online role-playing game, Guild Wars Nightfall
- Isthmus: a version of Panama and/or Nicaragua (actually filmed in Mexico City and Acapulco, Mexico) in the James Bond film Licence to Kill
- Ivalice: a location in the Final Fantasy series.
- Ixania: a small Balkan country of little global importance in Eric Ambler's The Dark Frontier.
Read more about this topic: List Of Fictional Countries