Mary Harriman Rumsey (November 17, 1881 – December 18, 1934) was the founder of The Junior League for the Promotion of Settlement Movements, later known as the Junior League of the City of New York of the Association of Junior Leagues International Inc. Mary was the daughter of railroad magnate E.H. Harriman and sister to W. Averell Harriman, former New York State Governor and United States Diplomat. In 2015 she was posthumously inducted into the National Women's Hall of Fame.