Claire Elizabeth Foy (born 16 April 1984) is a British actress. She is best known for her portrayal of the young Queen Elizabeth II in the first two series of the Netflix series The Crown (2016–2017) for which she won a Primetime Emmy Award for Outstanding Lead Actress in a Drama Series.

Foy made her screen debut in the pilot episode of the supernatural comedy series Being Human (2008). Following her professional stage debut at the Royal National Theatre, she played the title role in the BBC One miniseries Little Dorrit (2008) and made her film debut in the American historical fantasy drama Season of the Witch (2011). Following leading roles in the television series The Promise (2011) and Crossbones (2014), Foy earned praise for portraying the ill-fated queen Anne Boleyn in the BBC miniseries Wolf Hall (2015), receiving a British Academy Television Award for Best Actress nomination.

In 2018, she starred in Steven Soderbergh's psychological thriller Unsane and portrayed Janet Shearon, wife of astronaut Neil Armstrong, in Damien Chazelle's biopic First Man. For the latter she received a nomination for the Golden Globe Award and the BAFTA Award for Best Supporting Actress. In 2021, she portrayed Margaret Campbell, Duchess of Argyll in the Amazon Prime series A Very British Scandal, and in 2022, she starred in the drama film Women Talking.