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.

An American comic book is a thin periodical originating in the United States, on average 32 pages, containing comics. While the form originated in 1933, American comic books first gained popularity after the 1938 publication of Action Comics, which included the debut of the superhero Superman. This was followed by a superhero boom that lasted until the end of World War II. After the war, while superheroes were marginalized, the comic book industry rapidly expanded and genres such as horror, crime, science fiction and romance became popular. The 1950s saw a gradual decline, due to a shift away from print media in the wake of television and the impact of the Comics Code Authority. The late 1950s and the 1960s saw a superhero revival and superheroes remained the dominant character archetype throughout the late 20th century into the 21st century.