Unknown (also known as Unknown Worlds) was an American pulp fantasy fiction magazine, published from 1939 to 1943 by Street & Smith, and edited by John W. Campbell. Unknown was a companion to Street & Smith's science fiction pulp, Astounding Science Fiction, which was also edited by Campbell at the time; many authors and illustrators contributed to both magazines.

Magazines listed for Unknown Fantasy Fiction:

Unknown Fantasy Fiction September 1940
September 1940

Magazines listed for Unknown Worlds:

Unknown Worlds February 1943
February 1943

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