She is best known for her portrayal of Queen Elizabeth II in the Netflix drama series The Crown (2016–2023), for which she received various accolades such as a Golden Globe and two Primetime Emmy Awards.

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.

She has since portrayed Margaret Campbell, Duchess of Argyll in the Amazon Prime series A Very British Scandal (2021), and starred in the drama films Women Talking (2022) and All of Us Strangers (2023).

[4] Foy was educated at Aylesbury High School from the age of 12, until 2002,[5] and later studied drama at Liverpool John Moores University.

[8] After appearing on television,[9] she made her professional stage debut in DNA and The Miracle, two of a trio of single acts directed by Paul Miller at the Royal National Theatre in London (the third was Baby Girl).

[13][14] Foy also starred in the BBC revival of Upstairs Downstairs as Lady Persephone,[15] and co-starred in the Channel 4 serial The Promise, broadcast in February 2011.

[24][25] In 2016, Foy portrayed Queen Elizabeth II in Peter Morgan's Netflix biographical drama series The Crown.

[33] In 2018, Foy starred in Steven Soderbergh's psychological thriller Unsane,[34] portrayed the vigilante Lisbeth Salander in the action-thriller The Girl in the Spider's Web,[35] and played Janet Shearon, wife of American astronaut Neil Armstrong, in Damien Chazelle's biopic First Man.

[37][38][39] In 2020, Foy reprised the role of the young Queen Elizabeth II in the eighth episode of The Crown's fourth season.