Helen Elizabeth McCrory OBE (17 August 1968 – 16 April 2021) was an English actress. After studying at the Drama Centre London, she made her stage debut in The Importance of Being Earnest in 1990. Other stage roles include playing Lady Macbeth in Macbeth at Shakespeare's Globe, Olivia in Twelfth Night and Rosalind in As You Like It in the West End.

McCrory portrayed Cherie Blair in both The Queen (2006) and The Special Relationship (2010), alongside Michael Sheen who also portrayed husband and Prime Minister Tony Blair in both. She also portrayed Françoise in the film Charlotte Gray (2001), the dark anti-heroine Narcissa Malfoy in the final three Harry Potter films (2009, 2010, 2011), Mama Jeanne in Martin Scorsese's family film Hugo (2011), Clair Dowar in the James Bond film Skyfall (2012), Polly Gray in Peaky Blinders (2013–2019), Emma Banville in Fearless (2017) and Kathryn Villiers in MotherFatherSon (2019).