Peggy Orenstein (born November 1961 in Minneapolis, Minnesota) is the author of the New York Times best-sellers Girls & Sex'', Cinderella Ate My Daughter and Waiting for Daisy, a memoir.

Previous books include, Flux: Women on Sex, Work, Kids, Love and Life in a Half-Changed World and SchoolGirls: Young Women, Self-Esteem and the Confidence Gap. A contributing writer for the New York Times Magazine, in 2012 she was named by The Columbia Journalism Review as one of its "40 Women Who Changed the Media Business in the Past 40 Years".