Lani Guinier (; born April 19, 1950) is an American civil rights theorist.
She is the Bennett Boskey Professor of Law at Harvard Law School, and the first woman of color appointed to a tenured professorship there.
Guinier was a Professor of Law at the University of Pennsylvania Law School for ten years, before joining Harvard Law School in 1998.
Guinier's work includes professional responsibilities of public lawyers, the relationship between democracy and the law, the role of race and gender in the political process, college admissions, and affirmative action.