Imagination Unlimited is an anthology of science fiction short stories edited by Everett F. Bleiler and T. E. Dikty, first published in hardcover by Farrar, Straus & Young in 1952. As originally published, the anthology includes thirteen stories by various authors, with an introduction and four brief essays by the editors. In the UK The Bodley Head published the work as two separate anthologies in 1953, one, containing the first six stories, under the same title as the American edition and the other, containing the remaining seven stories, as Men of Space and Time. The anthology was also reprinted in an abridged paperback edition containing seven of the stories by Berkley Books in April, 1959. Only the original edition included the introduction and the essays.