Action Comics #1 is the first issue of the original run of the comic book/magazine series Action Comics. It features the first appearance of several comic-book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman—and sold for 10 cents. It is widely considered to be both the beginning of the superhero genre and the most valuable comic book in the world. Action Comics would go on to run for 904 numbered issues before it restarted its numbering in the fall of 2011. It returned to its original numbering with issue #957, published on June 8, 2016 and reached its 1,000th issue in 2018.

Action Comics is an American comic book/magazine series that introduced Superman, one of the first major superhero characters. The publisher was originally known as National Allied Publications, and later as National Comics Publications and as National Periodical Publications, before taking on its current name of DC Comics. Its original incarnation ran from 1938 to 2011 and stands as one of the longest-running comic books with consecutively numbered issues. The second volume of Action Comics beginning with issue #1 ran from 2011 to 2016. Action Comics returned to its original numbering beginning with issue #957.