Fiona Shaw (born Fiona Mary Wilson; 10 July 1958) is an Irish actress and theatre and opera director. She is known for her role as Petunia Dursley in the Harry Potter film series (2001–10), as Marnie Stonebrook on season four of the HBO series True Blood (2011), and as Carolyn Martens on the BBC America series Killing Eve (2018–present), for which she won the 2019 BAFTA TV Award for Best Supporting Actress. For her performances in the second seasons of Killing Eve and the comedy-drama Fleabag, Shaw received Primetime Emmy Award nominations for Outstanding Supporting Actress in a Drama Series and Outstanding Guest Actress in a Comedy Series respectively.Shaw has worked extensively with the Royal Shakespeare Company and the National Theatre. She won the 1990 Olivier Award for Best Actress for various roles, including Electra, the 1994 Olivier Award for Best Actress for Machinal, and the 1997 Drama Desk Award for Outstanding Solo Performance for The Waste Land. Her other stage work includes playing the title role in Medea in the West End and on Broadway (2001–02). She was awarded an Honorary CBE in 2001.