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Final Blackout is a dystopic science fiction novel by author L. Ron Hubbard. The novel is set in the future and follows a man known as "the Lieutenant" as he restores order to England after a world war. First published in serialized format in 1940 in the science fiction magazine Astounding Science Fiction, Final Blackout was published in book form in 1948 by The Hadley Publishing Co.. Author Services Inc. published a hardcover edition of the book in 1988, and in 1989 the Church of Scientology-affiliated organization Bridge Publications said that a film director named Christopher Cain had signed a contract to write and direct a movie version based on the book.

The novel was generally well received by literature critics, and is seen as an early classic of the Golden Age of Science Fiction. It has received positive mention in the Chicago Sun-Times and the Daily News of Los Angeles, and has been used in a science-fiction writing class at California State Polytechnic University, Pomona.