Dame Harriet Mary Walter, DBE is an English actress, best known for her work in the theatre. She won the 1988 Olivier Award for Best Actress in a Revival and the 2005 Evening Standard Award for Best Actress.
Walter starred as Helena in the Royal Shakespeare Company's production of All's Well That Ends Well and made her Broadway debut when the production transferred to New York in 1983. Other Notable roles with the RSC include, Viola in Twelfth Night, Masha in Three Sisters, Lady Macbeth in Macbeth and Cleopatra in Antony and Cleopatra. In 2005, she starred in the West End production of Mary Stuart, before transferring to Broadway in 2009, receiving a Tony Award nomination for Best Actress in a Play. Other New York stage credits include her roles in the Off-Broadway productions of Three Birds Alighting on a Field and an all-female version of Julius Caesar.
She was made a CBE in 2000 and a Dame in 2011.