1917 is a 2019 British war film directed and produced by Sam Mendes, and written by Mendes and Krysty Wilson-Cairns. It stars George MacKay, and Dean-Charles Chapman, with Mark Strong, Andrew Scott, Richard Madden, Claire Duburcq, Colin Firth, and Benedict Cumberbatch in supporting roles. The film is partially inspired by stories told to Mendes by his paternal grandfather Alfred, about his service during World War I.[6] Taking place after the German retreat to the Hindenburg Line during Operation Alberich, the film follows two British soldiers ordered to deliver a message calling off a doomed offensive attack. This message is especially important to one of them because his brother will be part of the attack.

The project was announced in June 2018, with MacKay and Chapman signing on in October and the rest of the cast the following March. Filming took place from April to June 2019 in the UK, with cinematographer Roger Deakins and editor Lee Smith using long takes to have the entire film appear as two continuous shots.