The Long Day's Dying is a 1968 British Techniscope war film directed by Peter Collinson, based on the 1962 novel of the same name by Alan White and starring David Hemmings. It was listed to compete at the 1968 Cannes Film Festival, but the festival was cancelled due to the events of May 1968 in France. The film was then able to compete at the 1968 San Sebastián International Film Festival, where it won its top prize, the Golden Shell for Best Film.