Once Upon a Time... Space (French: Il était une fois… l'Espace) is a science fiction animated television series created and directed by Albert Barillé. It is the second series in the Once Upon a Time... franchise. It reprises almost all of the characters from its predecessor, Once Upon a Time... Man, and adapts them into a science fiction futuristic context.

The series was produced by French studio Procidis in co-production with France Régions (FR3, France), Société Radio-Canada (Canada), Radiotelevisione italiana (RAI, Italy), Katholieke Radio Omroep (KRO, Netherlands), Televisión Española (TVE, Spain), Crustel (Argentina), and Eiken (Japan) who was the one who made the animation. The series premiered in France on FR3, between 2 October 1982 and 2 April 1983, and it was subsequently broadcast on the channels of the rest of the broadcasters that participated in the production dubbed into their own language.

The show was animated in Japan by the animation studio Eiken, and is thus considered an anime as it also aired in Japan on Fuji Television, albeit not until 1984, under the title Galaxy Patrol PJ. In contrast to the show's success in the West, the series' Japanese broadcast was consigned to an early-morning time slot and attracted little attention, although it did gain a cult following in Japan in the following years. The Japanese dub for the anime is considered to be a lost media due to it never having a home release and only re-aired on AT-X during the summer of 2006.