Harry Brown is a 2009 British vigilante action-thriller film directed by Daniel Barber and starring Michael Caine, Emily Mortimer, Jack O'Connell, and Liam Cunningham. The story follows Harry Brown, a widowed Royal Marines veteran who had served in Northern Ireland during The Troubles, living on a London housing estate that is rapidly descending into youth crime. After a violent gang murders his friend, Harry decides to take justice into his own hands.

The film also features actor and rapper Plan B, who recorded the film's theme music track "End Credits" with Chase & Status. Harry Brown premiered on 12 September 2009 as a "Special Presentation" at the 2009 Toronto International Film Festival and was released theatrically in the United Kingdom by Lionsgate UK on 11 November 2009; the film was released in the United States by Samuel Goldwyn Films and Destination Films on 30 April 2010. The film received mixed reviews from critics, who praised Caine's performance but criticized the excessive violence.