Elizabeth Greer Feldstein (born June 24, 1993) known professionally as Beanie Feldstein, is an American actress and singer. She has played supporting roles in the comedy film Neighbors 2: Sorority Rising (2016) and the comedy-drama film Lady Bird (2017). For her starring role as a high school senior in the comedy Booksmart (2019), she received a nomination for the Golden Globe Award for Best Actress – Motion Picture Comedy or Musical.
On Broadway, she has appeared in a production of Hello, Dolly! from 2017 to 2018, and in television, she has taken on a recurring role in What We Do in the Shadows (2019).
Feldstein was born in Los Angeles, the only daughter of Sharon Lyn (née Chalkin), a costume designer and fashion stylist, and Richard Feldstein, a tour accountant for Guns N' Roses. Feldstein is Jewish. Feldstein is the youngest of three children; her elder brother is actor Jonah Hill while her elder brother, Maroon 5 manager Jordan Feldstein (1977–2017), died suddenly of a blood clot at age 40. Her caretaker nicknamed her "Beanie" when she was an infant, and her brothers kept it up. She attended the Harvard-Westlake School in Los Angeles and Stagedoor Manor, a theatre camp in New York. She and fellow Broadway and film actor Ben Platt have been best friends since high school. She graduated from Wesleyan University in 2015 with a degree in sociology.