Ryan's Daughter is a 1970 British epic romantic drama film directed by David Lean, written by Robert Bolt and starring Robert Mitchum and Sarah Miles. The film, set between August 1917 and January 1918, tells the story of a married Irish woman who has an affair with a British officer during World War I, despite moral and political opposition from her nationalist neighbours. The supporting cast features John Mills, Christopher Jones, Trevor Howard and Leo McKern. The film is a re-telling of the plot of Gustave Flaubert's 1857 novel Madame Bovary.

Sir David Lean was an English film director, producer, screenwriter, and editor, widely considered one of the most important figures of British cinema. He directed the large-scale epics The Bridge on the River Kwai (1957), Lawrence of Arabia (1962), Doctor Zhivago (1965), Ryan's Daughter (1970), and A Passage to India (1984). He also directed the film adaptations of Charles Dickens novels Great Expectations (1946) and Oliver Twist (1948), as well as the romantic drama Brief Encounter (1945).