This Island Earth is a 1955 American science fiction film produced by William Alland, directed by Joseph M. Newman and Jack Arnold, and starring Jeff Morrow, Faith Domergue and Rex Reason. It is based on the 1952 novel of the same name by Raymond F. Jones. The film, distributed by Universal-International, was released in 1955 on a double feature with Abbott and Costello Meet the Mummy.

Science fiction is a film genre that uses speculative, fictional science-based depictions of phenomena that are not fully accepted by mainstream science, such as extraterrestrial lifeforms, spacecraft, robots, cyborgs, mutants, interstellar travel, time travel, or other technologies. Science fiction films have often been used to focus on political or social issues, and to explore philosophical issues like the human condition.