Space Ranger is a science fiction hero who was published by American company DC Comics in several of their 1950s and 1960s anthology titles. He first appeared in Showcase #15 and was created by writers Edmond Hamilton and Gardner Fox and artist Bob Brown. The character has notable similarities to a preceding character named David "Lucky" Starr, created by novelist Isaac Asimov in his 1952 novel David Starr, Space Ranger. After appearing in Showcase #15 and 16, the Space Ranger was given a cover-starring series in Tales of the Unexpected, starting with issue #40 and lasting until #82 (1959–64). Afterwards, he moved to Mystery in Space.

Showcase is a comic anthology series published by DC Comics. The general theme of the series was to feature new and minor characters as a way to gauge reader interest in them, without the difficulty and risk of featuring untested characters in their own ongoing titles. Showcase is regarded as the most successful of such tryout series, having been published continuously for more than 14 years, launching numerous popular titles, and maintaining a considerable readership of its own. The series ran from March–April 1956 to September 1970, suspending publication with issue #93, and then was revived for eleven issues from August 1977 to September 1978.