Sinister Barrier is an English-language science fiction novel by British writer Eric Frank Russell. The novel originally appeared in the magazine Unknown in 1939, the first novel to appear in its pages. It was first published in book form in 1943 by The World's Work, Ltd. Russell revised and expanded the book for its first US publication by Fantasy Press in 1948. Most subsequent editions were based on the Fantasy Press version.

Eric Frank Russell was a British writer best known for his science fiction novels and short stories. Much of his work was first published in the United States, in John W. Campbell's Astounding Science Fiction and other pulp magazines. Russell also wrote horror fiction for Weird Tales and non-fiction articles on Fortean topics. Up to 1955 several of his stories were published under pseudonyms, at least Duncan H. Munro and Niall(e) Wilde.