Kryptonians are a fictional extraterrestrial race within the DC Comics universe that originated on the planet Krypton. The term originated from the stories of DC Comics superhero, Superman. The stories also use "Kryptonian" as an adjective to refer to anything created by or associated with the planet itself or the cultures that existed on it.

Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioned in stories starring the superhero Superman as the world from whence he came. The planet was created by Jerry Siegel and Joe Shuster, and was named after the chemical element krypton. The planet was first mentioned in Action Comics #1 and made its first appearance in Superman #1 (1939).