Olivia Kate Cooke (born 27 December 1993) is an English actress. In television, she has starred as Emma Decody in the thriller Bates Motel (2013–2017), Becky Sharp in the period drama Vanity Fair (2018), and Alicent Hightower in the fantasy drama House of the Dragon (2022–present).

In film, Cooke has starred in the horror film Ouija (2014), the comedy-drama film Me and Earl and the Dying Girl (2015), the thriller Thoroughbreds (2017), the science fiction film Ready Player One (2018), and the drama Sound of Metal (2020).