Fifty Dead Men Walking is a 2008 English-language crime thriller film written and directed by Kari Skogland. It is a loose adaptation of Martin McGartland's 1997 autobiography of the same name. It premiered in September 2008, and stars Jim Sturgess as McGartland, a British agent who went undercover into the Provisional Irish Republican Army (IRA), and Ben Kingsley as Fergus, his British handler.

The film is set from 1988 until 1991, the time in which McGartland acted as an undercover agent within the IRA during The Troubles. In 1991, his cover was blown and he was kidnapped by the IRA, although he later escaped from an interrogation and execution, and went into hiding.

At the time of the release of the film, McGartland was still in hiding. The film takes its name from McGartland's claim within his book to have saved the lives of fifty people (police officers, soldiers, and prison guards) during his time as an agent.