Barry Lyndon is a 1975 epic historical drama film written, directed, and produced by Stanley Kubrick, based on the 1844 novel The Luck of Barry Lyndon by William Makepeace Thackeray. Narrated by Michael Hordern, and starring Ryan O'Neal, Marisa Berenson, Patrick Magee, Leonard Rossiter and Hardy Krüger, the film recounts the early exploits and later unravelling of an 18th-century Anglo-Irish rogue and golddigger who marries a rich widow to climb the social ladder and assume her late husband's aristocratic position.

Kubrick began production on Barry Lyndon after his 1971 film A Clockwork Orange. He had originally intended to direct a biopic on Napoleon, but lost his financing because of the commercial failure of the similar 1970 Dino De Laurentiis-produced Waterloo. Kubrick eventually directed Barry Lyndon, set partially during the Seven Years' War, utilising his research from the Napoleon project. Filming began in December 1973 and lasted roughly eight months, taking place in England, Ireland, and Germany.

The film's cinematography has been described as ground-breaking. Especially notable are the long double shots, usually ended with a slow backwards zoom, the scenes shot entirely in candlelight, and the settings based on William Hogarth paintings. The exteriors were filmed on location in England, Ireland, and Germany, with the interiors shot mainly in London. The production had problems related to logistics, weather, and politics (Kubrick feared that he might be an IRA hostage target).

Stanley Kubrick (; July 26, 1928 – March 7, 1999) was an American film director, screenwriter, producer, and photographer. Widely considered one of the greatest filmmakers of all time, his films were nearly all adaptations of novels or short stories, spanning a number of genres and gaining recognition for their intense attention to detail, innovative cinematography, extensive set design, and dark humor.

Born and raised in New York City, Kubrick was an average school student but displayed a keen interest in literature, photography, and film from a young age; he began to teach himself all aspects of film producing and directing after graduating from high school. After working as a photographer for Look magazine in the late 1940s and early 1950s, he began making low-budget short films and made his first major Hollywood film, The Killing, for United Artists in 1956. This was followed by two collaborations with Kirk Douglas: the anti-war film Paths of Glory (1957) and the historical epic film Spartacus (1960).

In 1961, Kubrick left the United States due to concerns about crime in the country, as well as a growing dislike for how Hollywood operated and creative differences with Douglas and the film studios; he settled in England, which he would leave only a handful of times for the rest of his life. He made his home at Childwickbury Manor, which he shared with his wife Christiane, and it became his workplace where he centralized the writing, research, editing, and management of his productions. This permitted him almost complete artistic control over his films, with the rare advantage of financial support from major Hollywood studios. His first productions in England were two films with Peter Sellers: an adaptation of Lolita (1962) and the Cold War black comedy Dr. Strangelove (1964).