Saoirse Una Ronan (/ˈsɜːrʃə ˈuːnə ˈroʊnən/ SUR-shə; born 12 April 1994) is an Irish-American actress. Primarily noted for her roles in period dramas since adolescence, Ronan has received several awards including a Golden Globe Award and nominations for four Academy Awards and five British Academy Film Awards.
Ronan made her acting debut in 2003 with the Irish medical drama series The Clinic and her film debut in the romantic comedy I Could Never Be Your Woman (2007). Her breakthrough came with the part of a precocious teenager in Atonement (2007), for which she was nominated for the Academy Award for Best Supporting Actress. Ronan followed this with starring roles of a murdered girl seeking closure in The Lovely Bones (2009) and a teenage assassin in Hanna (2011), and the supporting part of a baker in The Grand Budapest Hotel (2014). She has received critical acclaim for playing a homesick Irish immigrant in 1950s New York in Brooklyn (2015), the eponymous high school senior in Greta Gerwig's Lady Bird (2017), and Jo March in Gerwig's Little Women (2019). Ronan was nominated for the Academy Award for Best Actress for all three performances, and won a Golden Globe Award for Best Actress for Lady Bird.