Dunkirk is a 2017 English-language war film written, co-produced and directed by Christopher Nolan. The film stars Fionn Whitehead, Tom Glynn-Carney, Jack Lowden, Harry Styles, Aneurin Barnard, James D'Arcy, Barry Keoghan, Kenneth Branagh, Cillian Murphy, Mark Rylance, and Tom Hardy. Set during the Second World War, it concerns the Dunkirk evacuation. Distributed by Warner Bros. Pictures, the film is an international co-production between the United Kingdom, the United States, France and the Netherlands.

Nolan wrote the script, told from three perspectives—the land, sea, and air—to contain little dialogue and create suspense solely through details. Filming began in May 2016 in Dunkirk, France, and ended in Los Angeles, United States, where it also began post-production. Cinematographer Hoyte van Hoytema shot the film on IMAX 65 mm and 65 mm large format film stock. The film made extensive use of practical effects, such as employing thousands of extras, assembling boats that had participated in the real Dunkirk evacuation, and using genuine era-appropriate planes for aerial sequences.

Dunkirk had its world premiere on 13 July 2017 at Odeon Leicester Square in London, England, and was theatrically released in the United Kingdom and United States on 21 July 2017 in IMAX, 70 mm and 35 mm film. It has grossed over $107 million worldwide and was praised by critics for its cinematography, direction, acting and Hans Zimmer's musical score, with some critics calling it one of the greatest war films ever, as well as Nolan's best film to date.