Sophia Lillis was born on February 13, 2002 in Crown Heights, Brooklyn, New York City. She started acting when she was seven years old, taking classes at the Lee Strasberg Theatre and Film Institute.
Lillis made her acting debut in 2014 with the film A Midsummer Night's Dream and later she starred in the film 37. She played one of the leads, Beverly Marsh, in the horror film It, an adaptation of Stephen King's novel, directed by Andy Muschietti, and also starring Jaeden Lieberher, Finn Wolfhard, Wyatt Oleff, Bill Skarsgård, Jack Dylan Grazer, Jeremy Ray Taylor and Chosen Jacobs.
In 2017, Lillis played one of Kristen Bell and Dax Shepard's children in Sia's music video, "Santa's Coming for Us".

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