The Green Goblin is the alias of several supervillains appearing in American comic books published by Marvel Comics. Created by writer Stan Lee and artist Steve Ditko, the first and best-known incarnation of the Green Goblin is Norman Osborn, who is regarded as one of the superhero Spider-Man's three archenemies, alongside Doctor Octopus and Venom. Originally a manifestation of chemically induced insanity, others would later take on the persona, including Norman's son Harry Osborn. The Green Goblin is depicted as a criminal mastermind who uses an arsenal of Halloween-themed equipment, including grenade-like Pumpkin Bombs, razor-sharp bats, and a flying Goblin Glider, to terrorize New York City.

A supervillain or supercriminal is a variant of the villainous stock character. It is sometimes found in comic books, and may possess superhuman abilities. A supervillain is the antithesis of a superhero.