28 Days Later is a 2002 British (Cinema of the United Kingdom) post-apocalyptic (Apocalyptic and post-apocalyptic fiction) horror (horror film)/science fiction film directed by Danny Boyle. The screenplay was written by Alex Garland, the film stars Cillian Murphy, Naomie Harris, Brendan Gleeson, Noah Huntley, and Christopher Eccleston. The plot depicts the breakdown of society following the accidental release of a highly contagious "rage" virus and focuses upon the struggle of four survivors to cope with the ruination of the life they once knew.

A critical and commercial success, the film is widely recognized for images of a deserted London, and was shot almost entirely on digital video. The film spawned a 2007 sequel, 28 Weeks Later, a graphic novel entitled 28 Days Later: The Aftermath, which expands on the timeline of the outbreak, and a 2009 comic book series 28 Days Later (28 Days Later (comics)).