Day Million is a collection of science fiction short stories by American writer Frederik Pohl, published in June 1970.

The title story, "Day Million", details the romance between two people, referred to as Don and Dora (shortened versions of their full names), who bump into each other for the first time on the millionth day CE, which the author describes as being about a thousand years in the future.

Don is described as handsome and bronze, but is revealed to be a partial cyborg who has a metal radiation shield over his entire body to protect him while helping to pilot a starship.

In contrast, "Under Two Moons" combines a parody of the John Carter stories by Edgar Rice Burroughs, with the hero cast as a space-traveling secret agent in the style of James Bond.

It was originally published as humorous essay on the "Editor's Page" of Galaxy Science Fiction (June 1962).