Macbeth is a 1971 historical drama film directed by Roman Polanski, and co-written by Polanski and Kenneth Tynan. A film adaptation of William Shakespeare's tragedy of the same name, it tells the story of the Highland lord who becomes King of Scotland through treachery and murder. Jon Finch and Francesca Annis star as the title character and his wife, noted for their relative youth as actors. Themes of historic recurrence, greater pessimism and internal ugliness in physically beautiful characters are added to Shakespeare's story of moral decline, which is presented in a more realistic style.

The Third Murderer is a character in William Shakespeare's tragedy Macbeth (1606). He appears in one scene (3.3), joining the First and Second Murderers to assassinate Banquo and Fleance, at the orders of Macbeth.