The Seven Sisters is a loose association of seven liberal arts colleges in the Northeastern United States that are historically women's colleges. Five of the seven institutions continue to offer all-female undergraduate programs: Barnard College, Bryn Mawr College, Mount Holyoke College, Smith College, and Wellesley College. Vassar College has been co-educational since 1969. Radcliffe College and its all-male coordinate school Harvard College (both of which were part of Harvard University) effectively merged in 1977, although Radcliffe did not take its current form as the Radcliffe Institute for Advanced Study until 1999. Barnard College was Columbia University's women's liberal arts undergraduate college until its all-male coordinate school Columbia College went co-ed in 1983; to this day, Barnard continues to be an all-women's undergraduate college affiliated with Columbia.
All seven schools were founded between 1837 and 1889. Four are in Massachusetts, two are in New York, and one is in Pennsylvania.
Irene Harwarth, Mindi Maline, and Elizabeth DeBra note that "Independent nonprofit women’s colleges, which included the 'Seven Sisters' were founded to provide educational opportunities to women equal to those available to men and were geared toward women who wanted to study the liberal arts". The colleges also offered broader opportunities in academia to women, hiring many female faculty members and administrators.