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- Karathia: Slavic monarchy in the Three Young Investigators series.
- Karistan: Central European country in the Polish-American movie Legend of the white horse.
- Karlova: European kingdom in Edgar Rice Burroughs's The Rider.
- Karlsberg: principality of the hero of Sigmund Romberg's "The Student Prince" (1924 Broadway musical; 1954 film with Mario Lanza).
- Karovia: European kingdom from the movie Trouble for Two.
- Kasnia: war-torn Eastern European monarchy in the DC Animated Universe.
- Katzenstok: a republic in the Balkans from Road Rovers TV series.
- Keltic Sultanate: Islamic sultanate comprising the British Isles. From the alternate history book The Years of Rice and Salt, by Kim Stanley Robinson.
- Krakozhia: from the movie The Terminal. An identically named country is featured in Marvel Comics and various spin-offs featuring Doctor Doom.
- Krasnia: Ivor Novello's Glamorous Night, Stage play, 1935.
- Kravonia: Eastern European country from the novel Sophy of Kravonia by Anthony Hope and the subsequent movie.
- Krayia: realm of Queen Nadya in Noël Coward's, "The Queen Was in the Parlour" (play, 1922).
- Kreblakistan: rogue former Soviet(?) republic and source of Dr. Evil's nuclear weapon in Austin Powers: International Man of Mystery.
Read more about this topic: List Of Fictional European Countries