Watchmen is a graphic novel by writer Alan Moore, artist Dave Gibbons, and colorist John Higgins, serialised as a limited series by DC Comics in 1986 and 1987, and collected in 1987. Watchmen originated from a storey proposal Moore submitted to DC featuring superhero characters that the company had acquired from Charlton Comics. As Moore's proposed storey would have left many of the characters unusable for future stories, managing editor Dick Giordano convinced the writer to create original characters instead.

Moore used the storey as a means to reflect contemporary anxieties and to critique the superhero concept. Watchmen depicts an alternate history where superheroes emerged in the 1940s and 1960s, helping the United States to win the Vietnam War. The country is edging towards a nuclear war with the Soviet Union, freelance costumed vigilantes have been outlawed and most former superheroes are in retirement or working for the government. The storey focuses on the personal development and struggles of the protagonists as an investigation into the murder of a government sponsored superhero pulls them out of retirement, and eventually leads them to confront a plot that would stave off nuclear war by killing millions of people.

Creatively, the focus of Watchmen is on its structure. Gibbons used a nine-panel grid layout throughout the series and added recurring symbols such as a blood-stained smiley face. All but the last issue feature supplemental fictional documents that add to the series' backstory, and the narrative is intertwined with that of another story, a fictional pirate comic titled Tales of the Black Freighter, which one of the characters reads. Structured as a nonlinear narrative, the storey skips through space, time and plot. Watchmen has received critical acclaim both in the comics and mainstream press, and is regarded by critics as a seminal text of the comics medium. After a number of attempts to adapt the series into a feature film, director Zack Snyder's Watchmen was released in 2009.