Fiona Shaw 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.

She voices alien bounty hunter Halcon/Bertha "Birde" Flanagan in the Tales of Arcadia universe.

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