Man of Earth is a science fiction novel by American writer Algis Budrys, first published in 1958 by Ballantine Books.

"The Man from Earth", a "greatly different" earlier version of the story, was published in the debut issue of Satellite Science Fiction in 1956.

His new commanding persona makes him swiftly rise in rank, and he soon concludes that Pluto intends to invade and plunder its neglectful mother planet.

Instead, Doncaster suddenly reveals that the Pluto colony was created by them as a stepping-stone to the stars, and that Earth will be left to go rancid, while "new men", like the rebuilt Sibley, conquer the universe.

Galaxy reviewer Floyd C. Gale wrote that Budrys had "cut a complex tale from simple cloth.