"Mars Is Heaven!" is a science fiction short story by American writer Ray Bradbury, originally published in 1948 in Planet Stories. "Mars Is Heaven!" was among the stories selected in 1970 by the Science Fiction Writers of America as one of the best science fiction short stories published before the creation of the Nebula Awards. As such, it was published in The Science Fiction Hall of Fame Volume One, 1929–1964. It also appears as the sixth chapter of The Martian Chronicles, revised as "The Third Expedition."