Mary Bronstein (née Wall, born September 7, 1979) is an American actress and filmmaker best known for the films Yeast (2008) and If I Had Legs I'd Kick You (2025). Bronstein was born in White Plains, New York, in 1979. She attended New York University Tisch School of the Arts. In 2007 Bronstein appeared in Frownland, directed by her future husband Ronald Bronstein. Her own directorial debut, Yeast, premiered at the 2008 South by Southwest Film Festival. Bronstein's second feature as director, If I Had Legs I'd Kick You, was announced in 2023 and premiered at the 2025 Sundance Film Festival. Produced by Elara Pictures and Fat City, the film will be distributed by A24.