Cyberpunk is a subgenre of science fiction set in a dystopian future. It is characterized by its focus on a combination of "low-life and high tech". It features a range of futuristic technological and scientific achievements, including artificial intelligence and cyberware, which are juxtaposed with societal collapse, dystopia or decay. A significant portion of cyberpunk can be traced back to the New Wave science fiction movement of the 1960s and 1970s. During this period, prominent writers such as Philip K. Dick, Michael Moorcock, Roger Zelazny, John Brunner, J. G. Ballard, Philip José Farmer and Harlan Ellison explored the impact of technology, drug culture, and the sexual revolution. These authors diverged from the utopian inclinations prevalent in earlier science fiction.

Comics exploring cyberpunk themes began appearing as early as Judge Dredd, first published in 1977. Released in 1984, William Gibson's influential debut novel Neuromancer helped solidify cyberpunk as a genre, drawing influence from punk subculture and early hacker culture. Frank Miller's Ronin is an example of a cyberpunk graphic novel. Other influential cyberpunk writers included Bruce Sterling and Rudy Rucker. The Japanese cyberpunk subgenre began in 1982 with the debut of Katsuhiro Otomo's manga series Akira, with its 1988 anime film adaptation (also directed by Otomo) later popularizing the subgenre.

Early films in the genre include Ridley Scott's 1982 film Blade Runner, one of several of Philip K. Dick's works that have been adapted into films (in this case, Do Androids Dream of Electric Sheep?). The "first cyberpunk television series" was the TV series Max Headroom from 1987, playing in a futuristic dystopia ruled by an oligarchy of television networks, and where computer hacking played a central role in many story lines. More recently, the animated series Batman Beyond (1999–2001) is considered a noteworthy example of the cyberpunk genre. The films Johnny Mnemonic (1995) and New Rose Hotel (1998), both based upon short stories by William Gibson, flopped commercially and critically, while Robocop (1987), Total Recall (1990), Judge Dredd (1995), and The Matrix trilogy (1999–2003) were more successful cyberpunk films.

Newer cyberpunk media includes Tron: Ares (2025) and Tron: Legacy (2010), sequels to the original Tron (1982); Blade Runner 2049 (2017), a sequel to the original 1982 film; Dredd (2012), which was not a sequel to the original movie; Ghost in the Shell (2017), a live-action adaptation of the original manga; Alita: Battle Angel (2019), based on the 1990s Japanese manga Battle Angel Alita; the 2018 Netflix TV series Altered Carbon, based on Richard K. Morgan's 2002 novel of the same name; and the video game Cyberpunk 2077 (2020) and original net animation (ONA) miniseries Cyberpunk: Edgerunners (2022), both based on R. Talsorian Games' 1988 tabletop role-playing game Cyberpunk.

Lawrence Person has attempted to define the content and ethos of the cyberpunk literary movement stating:

Classic cyberpunk characters were marginalized, alienated loners who lived on the edge of society in generally dystopic futures where daily life was impacted by rapid technological change, an ubiquitous datasphere of computerized information, and invasive modification of the human body.

— Lawrence Person

Cyberpunk plots often involve conflict between artificial intelligence, hackers, and megacorporations, and tend to be set in a near-future Earth, rather than in the far-future settings or galactic vistas found in novels such as Isaac Asimov's Foundation or Frank Herbert's Dune. The settings are usually post-industrial dystopias but tend to feature extraordinary cultural ferment and the use of technology in ways never anticipated by its original inventors ("the street finds its own uses for things"). Much of the genre's atmosphere echoes film noir, and written works in the genre often use techniques from detective fiction. There are sources who view that cyberpunk has shifted from a literary movement to a mode of science fiction due to the limited number of writers and its transition to a more generalized cultural formation.