Invaders from the Infinite is a science fiction novel by author John W. Campbell, Jr.. It was simultaneously published in 1961 by Gnome Press in an edition of 4,000 copies and by Fantasy Press in an edition of 100 copies. The book was originally intended to be published by Fantasy Press, but was handed over to Gnome Press when Fantasy Press folded. Lloyd Eshbach, of Fantasy Press, who was responsible for the printing of both editions, printed the extra copies for his longtime customers.