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- Gantha: Southern European state in James Elroy Flecker's King of Alsander (1914).
- Genovia: From The Princess Diaries novel series and movie adaptations (The Princess Diaries and The Princess Diaries 2: Royal Engagement). In the novels, it is a principality between Italy and France; in the film it is between Spain and France. Either way, it is based on Monaco, and to a lesser extent on Andorra.
- Glenraven: a tiny country in the Alps, no bigger than Liechtenstein, squeezed into the border between France and Italy in Glenraven series by Marion Zimmer Bradley.
- Glottenberg: kingdom in Sport Royal and The Heart of Princess Osra by Anthony Hope
- Gonobutz: Bob de Moor's Barelli comics.
- Granbretan: a future evil version of Great Britain where the noble classes hide behind metal masks of various totem animals, created by Michael Moorcock in his The History of the Runestaff books.
- Grand Fenwick: a duchy in The Mouse That Roared and sequels by Leonard Wibberley.
- Graustark: Eastern European country in several novels by George Barr McCutcheon.
- Grendel: England in Leslie Reid's Cauldron Bubble (1934).
- Groland: A parody of France and European microstates, shown on Canal Plus television.
- Grünewald: an imaginary Germanic state where the novel Prince Otto (1885) by Robert Louis Stevenson is set.
- Guilder: one of the fictional principalities in William Goldman's The Princess Bride.
Read more about this topic: List Of Fictional European Countries