Hayley Elizabeth Atwell (born 5 April 1982) is a British and American actress. Atwell rose to international prominence with her portrayal of Agent Peggy Carter in the Marvel Cinematic Universe superhero film Captain America: The First Avenger (2011), a role she reprised in the short film Agent Carter (2013) and the 2015–2016 television series of the same name in addition to other films and live-action and animated series. She also had roles in the war drama Testament of Youth (2014), the romantic fantasy Cinderella (2015), and the fantasy comedy-drama Christopher Robin (2018).
On the stage, Atwell has received Laurence Olivier Award nominations for Best Supporting Actress, for her role in A View from the Bridge (2010), and for Best Actress, for her leading performances in The Pride (2013) and Rosmersholm (2020). In 2020, Atwell began hosting the podcast series True Spies, which aims to give an insight into the world of espionage by asking listeners what they would do in real-life spy situations.