Greta Scacchi OMRI (born 18 February 1960) is an Italian-Australian actress. She is best known for her roles in the films White Mischief (1987), Presumed Innocent (1990), The Player (1992), Emma (1996), and Looking for Alibrandi (2000).

Her first leading role, in Heat and Dust (1983), earned her a BAFTA nomination for Best Newcomer to Film. For her portrayal of Empress Alexandra Fyodorovna of Russia in the television film, Rasputin: Dark Servant of Destiny (1996), she won a Primetime Emmy Award and earned a Golden Globe nomination for Best Supporting Actress. In 2006, Scacchi received a second Emmy nomination for her role in the television film Broken Trail, and earned her first Screen Actors Guild Award nomination.