George Stacy is a fictional character appearing in American comic books published by Marvel Comics, primarily in association with Spider-Man. He is Gwen Stacy's father and the police captain from the New York City Police Department. Stacy is a strong supporter of Spider-Man, often defending the superhero when others accuse Spider-Man of criminal acts, and thus serves as a foil personality to another Spider-Man related character, J. Jonah Jameson. Stacy's death in The Amazing Spider-Man #90 (November 1970) has been described as a turning point in the Spider-Man saga, signaling to readers that permanent changes could happen in the story, and that the supporting cast was not safe. Stacy was resurrected in a cloned body by Ben Reilly in Dead No More: The Clone Conspiracy (2016–2017), with the embodiment of Death herself confirming in Ben Reilly: The Scarlet Spider (2017–2018) that all clones Ben created of deceased people had their souls intact on being brought back, before Stacy was killed again by the Carrion Virus.

The character has been adapted from the comics into several forms of media, including animated series and feature films. In live-action, the character was played by James Cromwell in the film Spider-Man 3 (2007), by Denis Leary in Marc Webb's The Amazing Spider-Man film duology (2012–2014), and by Shea Whigham in Spider-Man: Across the Spider-Verse (2023) and Spider-Man: Beyond the Spider-Verse (TBA).

George Stacy first appeared in The Amazing Spider-Man #56 (January 1968), created by writer Stan Lee and artist John Romita Sr.

George Stacy is a respected former police member in the NYPD. He is the father of Gwen Stacy, husband of Helen Stacy and the brother of Arthur Stacy. Even in retirement, Stacy kept up with the happenings at the department - and had taken a keen interest in Spider-Man. John Jameson calls Stacy out of retirement to assist in the return of a device called the Nullifier - which could render any electrical or mechanical apparatus inoperative - that Doctor Octopus had tricked an amnesiac Spider-Man into stealing.

After safely securing the weapon, Stacy interviews Peter, believed to have been held captive with Doctor Octopus and Spider-Man. After the interview, Stacy reveals to Peter that he had spent time studying the career of Spider-Man, and that he is glad to have met Peter, known for photographing the wall-crawler on numerous occasions.

Identifying himself as a strong supporter of Spider-Man, Stacy wishes to see the wall-crawler redeemed in the public eye. He also takes an instant liking to Peter, and openly encourages the growing bond between Peter and Gwen. Shortly thereafter at a dance club which employs Mary Jane Watson, Stacy is put under a hypnotic trance through a rigged camera operated by Mary Jane who took photos of him unaware that these actions were aiding Wilson Fisk (aka the Kingpin). Stacy is placed under additional brainwashing by the camera's inventor, Dr. Winkler.

Despite Spider-Man's efforts, George returns programmed to follow the Kingpin's directions and steals police records for the Kingpin while Spider-Man's automatic camera captures the theft. Peter gave the photos to J. Jonah Jameson, hopeful that this apparent betrayal of the Stacy family would help prove George's innocence. While George and Gwen attempt to flee, they are kidnapped by the Kingpin's men and held captive at one of Norman Osborn's labs where Dr. Winkler worked. While Spider-Man battles the Kingpin, Osborn arrives and tackles the Kingpin's henchmen. Though the Kingpin flees and Winkler is apparently killed, the Stacys sre rescued. Osborn's testimony to the police exonerates George Stacy.

Captain Stacy later begins to suspect Peter and Spider-Man were the same person. After a feverish Peter admitted to being Spider-Man before his friends including Stacy, he asks the Prowler to imitate Spider-Man so Peter and Spider-Man can be seen together. However, this does not fool Stacy.