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The Dark Knight is a 2008 superhero film directed, produced, and co-written by Christopher Nolan. Based on the DC Comics character Batman, the film is the second installment of Nolan's The Dark Knight Trilogy and a sequel to 2005's Batman Begins, starring Christian Bale and supported by Michael Caine, Heath Ledger, Gary Oldman, Aaron Eckhart, Maggie Gyllenhaal, and Morgan Freeman. In the film, Bruce Wayne / Batman (Bale), Police Lieutenant James Gordon (Oldman) and District Attorney Harvey Dent (Eckhart) form an alliance to dismantle organized crime in Gotham City, but are menaced by an anarchistic mastermind known as the Joker (Ledger), who seeks to undermine Batman's influence and throw the city into anarchy.

Nolan's inspiration for the film was the Joker's comic book debut in 1940, the 1988 graphic novel The Killing Joke, and the 1996 series The Long Halloween, which retold Harvey Dent's origin. The "Dark Knight" nickname was first applied to Batman in Batman #1 (1940), in a story written by Bill Finger. The Dark Knight was filmed primarily in Chicago, as well as in several other locations in the United States, the United Kingdom, and Hong Kong. The film was the first mainstream feature to partially utilize IMAX 70 mm cameras, with Nolan using them for 28 minutes of the film, including the Joker's first appearance. Warner Bros. initially created a viral marketing campaign for The Dark Knight, developing promotional websites and trailers highlighting screenshots of Ledger as the Joker. Ledger died on January 22, 2008, some months after he completed filming and six months before the film's release from a toxic combination of prescription drugs, leading to intense attention from the press and movie-going public.

Considered one of the best films of its decade and one of the greatest and most influential superhero films of all time, the film received critical acclaim for its screenplay, visual effects, musical score, mature themes, performances (particularly Ledger's), cinematography, action sequences and direction. The film also set numerous records during its theatrical run. The Dark Knight appeared on 287 critics' top-ten lists, more than any other film of 2008 with the exception of WALL-E, and more critics (77) named The Dark Knight the best film released that year. With over $1 billion in revenue worldwide, it became the fourth-highest-grossing film at the time, and highest-grossing film of 2008; it also set the record for highest-grossing domestic opening with $158 million, a record it held for three years. At the 81st Academy Awards, the film received eight nominations; it won the award for Best Sound Editing and Ledger was posthumously awarded Best Supporting Actor. In 2020, the film was selected for preservation in the United States National Film Registry by the Library of Congress for being "culturally, historically, or aesthetically significant", becoming the second superhero film after 1978's Superman to earn the honor. The Dark Knight Rises, the final film in the trilogy, was released in 2012.