Doomsday is a fictional supervillain appearing in American comic books published by DC Comics, commonly in association with Superman. Created by writer-artist Dan Jurgens, the character had a cameo appearance in Superman: The Man of Steel #17 (November 1992) and made his first full appearance in Superman: The Man of Steel #18 (December 1992). Doomsday is an adversary to Superman, as well as the Justice League.

Doomsday ranked as #46 on IGN's list of the Top 100 Comic Book Villains of All Time. He is best known as the character who killed Superman in combat in The Death of Superman story arc. The character appears in the 2016 film Batman v Superman: Dawn of Justice, voiced and performed by Robin Atkin Downes through motion-capture.