Supergirl is the name of several fictional superheroines appearing in American comic books published by DC Comics. The original, current, and most well known Supergirl is Kara Zor-El, the cousin of superhero Superman. The character made her first appearance in Action Comics #252 and was created by Otto Binder and Al Plastino.

A superhero or superheroine is a stock character who typically possesses superpowers or abilities beyond those of ordinary people, is frequently costumed concealing their identity, and fits the role of the hero; typically using their powers to help the world become a better place, or dedicating themselves to protecting the public and fighting crime. Superhero fiction is the genre of fiction that is centered on such characters, especially, since the 1930s, in American comic books, as well as in Japanese media.