Solomon Grundy (Cyrus Gold) is a supervillain and occasional antihero appearing in American comic books published by DC Comics. He was originally depicted as a murder victim brought back to life as a corporeal revenant or zombie, though subsequent versions of the character have occasionally depicted a different origin. His name is taken from the 19th century nursery rhyme "Solomon Grundy".

Grundy was introduced as an enemy of comic book hero Alan Scott (the original Green Lantern), but has since become a prominent enemy for a number of superheroes such as Superman, Batman, and other members of the Justice League. As a revenant whose backstory often involves coming back to life after being deposited in the swamp, later writers have also given him ties to Swamp Thing, one of DC's horror-fantasy heroes.

Solomon Grundy has been adapted into numerous media outside comics, including television series and films. Mark Hamill and Fred Tatasciore, among others, have voiced the character in animation. The character made his live-action debut as The Acolyte in the second season of the Arrowverse series Arrow, portrayed by Graham Shiels, and appeared as Butch Gilzean in the first four seasons of Fox's television series Gotham, portrayed by Drew Powell. Grundy also appeared in the first and second seasons of Stargirl, portrayed via CGI.