Dark River is a 2017 British drama film written and directed by Clio Barnard, and starring Ruth Wilson, Mark Stanley, and Sean Bean. The film is loosely based on Rose Tremain's novel Trespass. Originally Barnard intended the film to be a straightforward adaptation of the novel, which was set in southern France and involved two sets of elderly siblings involved in a property dispute. Encouraged by the financiers to make the story her own, Barnard changed the location of the film to Yorkshire, and instead focused on a woman who returns to the home she fled 15 years earlier in order to claim the tenancy of her father's farm, who then becomes involved in a dispute with her brother. It screened in the Platform section at the 2017 Toronto International Film Festival and was released in the United Kingdom on 23 February 2018.