Dame Margaret Natalie Smith CH DBE (December 28, 1934 − September 27, 2024) was a British actress. Known for her wit in comedic roles, she had an extensive career on stage and screen over seven decades and was one of Britain's most recognisable and prolific actresses. She received numerous accolades including two Academy Awards, five BAFTA Awards, four Emmy Awards, three Golden Globe Awards and a Tony Award as well as nominations for six Laurence Olivier Awards. Smith was one of the few performers to earn the Triple Crown of Acting.

Smith began her stage career as a student, performing at the Oxford Playhouse in 1952, and made her professional debut on Broadway in New Faces of '56. Over the following decades Smith established herself alongside Judi Dench as one of the most significant British theatre performers, working for the National Theatre and the Royal Shakespeare Company. On Broadway, she received Tony Award nominations for Noël Coward's Private Lives (1975) and Tom Stoppard's Night and Day (1979), and won the Tony Award for Best Actress in a Play for Lettice and Lovage (1990).