Hayley Atwell is a British actress. Following her graduation from The Guildhall School of Drama and Music in 2005, she appeared in television movies, first gaining popularity for her roles in the period dramas Brideshead Revisited (2008), The Duchess (2008), and the miniseries The Pillars of the Earth (2010). She appeared in the series What If...? and Mission: Impossible - Dead Reckoning alongside Tom Cruise.

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She has worked with Marvel Studios in the role of Peggy Carter across various projects. She has appeared in the Captain America franchise, Marvel's Agent Carter, which ran from 2015 to 2016, Avengers: Age of Ultron, Avengers: Endgame, and Doctor Strange in the Multiverse of Madness.

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Beyond her acting work, Atwell released the single Whatcha Gonna Do (It's Up to You) [From Agent Carter Season 2] with Hollywood Studio Symphony and Enver Gjokaj. She has also hosted two True Crime podcasts for SPYSCAPE: True Russian Spy Missions and True Spies.