Lily Chloe Ninette Thomson (born 5 April 1989), known professionally as Lily James, is an English actress. She studied acting at the Guildhall School of Music and Drama in London. She began her career in the British television series Just William (2010). Following a supporting role in the period drama series Downton Abbey (2012–2015), her breakthrough was the title role in the fantasy film Cinderella (2015).

James went on to portray Natasha Rostova in the television adaptation of War & Peace (2016). She starred in several films, including the action film Baby Driver (2017), the period dramas Darkest Hour (2017), The Guernsey Literary and Potato Peel Pie Society (2018) and The Dig (2021), the musicals Mamma Mia! Here We Go Again (2018) and Yesterday (2019), and the sports drama The Iron Claw (2023). Her portrayal of Pamela Anderson in the biographical series Pam & Tommy (2022) earned her nominations for a Golden Globe and a Primetime Emmy Award.