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- Bacteria: thinly disguised version of Fascist Italy from the movie The Great Dictator. Bears the same name as the microorganism.
- Balinderry: strategically placed quasi-Irish nation that is crucial to a defence radar system, but has an IRA-type insurgency, in an episode of The Six Million Dollar Man.
- Balkistan: appeared in Allen Upward's The Prince of Balkistan (1895).
- Baltish, a fictional country from a Lithuanian TV show.
- Baltonia: probably a Baltic country in the movie Esupai.
- Bandrika (sometimes spelled Vandreka): Eastern European Alpine country, the setting of the first part of the movie The Lady Vanishes. The language spoken in this country is an amalgamation of several European languages.
- Barataria, fictional island nation, presumably in the Mediterranean; setting for part of Gilbert and Sullivan's The Gondoliers. Becomes a Republican Monarchy during the course of the operetta.
- Barscheit: a principality in The Princess Elopes (1905), a "Ruritanian" romance by Harold MacGrath.
- Bergen Ait: An uninhabited island in the Baltic Sea controlled by Great Britain in Biggles in the Baltic.
- Betonia: European kingdom in the movie His Royal Highness (1932).
- Blitva: state in northeastern Europe, ruled by a dictator; in a novel "Banket u Blitvi" (Banquet in Blitva) by Croatian novelist Miroslav Krleža.
- Borduria: totalitarian state from the comics series The Adventures of Tintin, located in the Balkans.
- Borginia: Northern-European country feature in Apollo Justice: Ace Attorney and Ace Attorney Investigations: Miles Edgeworth.
- Borostyria: kingdom in the 1933 Arsène Lupin novel The Woman with Two Smiles.
- Borovia: Central-European country from The Big Knights TV programme.
- Borovia (2): a communist Eastern European country in the G.I. Joe comics by Marvel Comics.
- Borsovia: a kingdom in Eastern Europe that featured in Gordon Murray's BBC Television children's puppet series A Rubovian Legend, 1955-63.
- Bothalia: a kingdom in the Balkan Mountains from the movie The Vagabond Prince.
- Braslavia: Slavic dictatorial country in Patrouille des Castors comics.
- Bratislavia: a fictional country mentioned in Count Duckula.
- Brazillia: A fictional Balkan republic after Albania joined Yugoslavia to make the Brazilian Republic in 2011 in the Death Enrising Novels.
- Bretzelburg: central European dictatorship from Spirou et Fantasio comics.
- Brogavia: A Nazi-occupied Balkan nation featured in Commando Comics.
- Buiron: appeared in A Thoroughly Modern Princess by Wendy Corsi Staub.
Read more about this topic: List Of Fictional European Countries