Lily Jane Collins (born 18 March 1989) is a British-American actress and model. Born in Guildford, Surrey, and raised in Los Angeles, Collins began acting at the age of two in the BBC comedy-drama Growing Pains. In the late 2000s, Collins began acting and modelling more regularly, and her career breakthrough came with her role in the sports drama The Blind Side, which became the third highest-grossing film of 2009. She then starred in feature films such as the science fiction action horror Priest (2011), the psychological action thriller Abduction (2011), the fantasy Mirror Mirror (2012), the urban fantasy The Mortal Instruments: City of Bones (2013), and the independent romantic comedies Stuck in Love (2012), The English Teacher (2013), and Love, Rosie (2014).

Collins received critical acclaim for her roles as Marla Mabrey in the comedy Rules Don't Apply (2016), which earned her a Golden Globe nomination for Best Actress – Motion Picture Comedy or Musical, and for her portrayal of a young woman with anorexia in the controversial Netflix drama To the Bone (2017). She also received acclaim for her work in biographical films: she played Liz Kendall in the Netflix drama Extremely Wicked, Shockingly Evil and Vile (2019), J. R. R. Tolkien's wife Edith in Tolkien (2019), and Rita Alexander in Mank (2020), the latter of which was a critical success and received 10 Academy Award nominations.

Collins played Fantine in the BBC miniseries adaptation of Les Misérables (2018–2019), and since 2020 she has portrayed Emily Cooper in the Netflix series Emily in Paris. For the latter role, she received a Golden Globe nomination for Best Actress – Television Series Musical or Comedy. She made her writing debut with the book Unfiltered: No Shame, No Regrets, Just Me (2017), in which she discussed her struggles with mental health, including an eating disorder she suffered from as a teenager.