Mary Elizabeth Magill (born 1966) is an American legal scholar specializing in administrative and constitutional law. She is an award-winning scholar, fellow of the American Academy of Arts and Sciences, member of the American Law Institute, and served on the Board of Trustees of the National Constitution Center. Magill spent 15 years on the faculty at the University of Virginia School of Law, where she held positions including vice dean and the Joseph Weintraub–Bank of America Distinguished Professor of Law. She then served as the 13th and first female dean of Stanford Law School from 2012 to 2019, holding the Richard E. Lang Professor of Law position, and later as executive vice president and provost at the University of Virginia from 2019 to 2022, the first woman in that role. Magill was nominated in January 2022 and assumed the role of the 9th president of the University of Pennsylvania in July 2022, becoming the former president when her tenure ended abruptly in December 2023 following her resignation amid backlash from congressional testimony on campus antisemitism. Post-resignation, she is listed as faculty at Penn Carey Law and professor emerita at Stanford Law School.