Fiona Mary Wilson is an Irish actress and theatre and opera director. She is known for her roles as Petunia Dursley in the Harry Potter film series (2001-2010), Marnie Stonebrook in the fourth season of the HBO series True Blood (2011) and Carolyn Martens in the BBC series Killing Eve (2018-present). Her other projects include The White King (2016), Lizzie (2018), Ammonite (2020), Enola Holmes (2020) and Kindred (2020). For her performance in Killing Eve, Shaw won the 2019 BAFTA TV Award for Best Supporting Actress. For her performances in the second seasons of Killing Eve and Fleabag, she received Primetime Emmy Award nominations for Outstanding Supporting Actress in a Drama Series and Outstanding Guest Actress in a Comedy Series respectively. For the third season of Killing Eve, she was again nominated for Outstanding Supporting Actress in a Drama Series.