The Dirty Dozen is a 1967 American war film directed by Robert Aldrich and starring Lee Marvin with an ensemble supporting cast including Ernest Borgnine, Charles Bronson, Jim Brown, John Cassavetes, Richard Jaeckel, George Kennedy, Ralph Meeker, Robert Ryan, Trini Lopez, Telly Savalas, Donald Sutherland, Clint Walker and Robert Webber. Set in 1944 during World War II, the film follows the titular penal military unit of twelve convicts as they are trained as commandos by the Allies for a suicide mission ahead of the Normandy landings.

War film is a film genre concerned with warfare, typically about naval, air, or land battles, with combat scenes central to the drama. It has been strongly associated with the 20th century. The fateful nature of battle scenes means that war films often end with them. Themes explored include combat, survival and escape, camaraderie between soldiers, sacrifice, the futility and inhumanity of battle, the effects of war on society, and the moral and human issues raised by war. War films are often categorized by their milieu, such as the Korean War; the most popular subjects are the Second World War and the American Civil War. The stories told may be fiction, historical drama, or biographical. Critics have noted similarities between the Western and the war film.