private, coeducational institution of higher learning in Poughkeepsie, New York, U.S., one of the Seven Sisters schools. It is a liberal arts college offering undergraduate studies in the arts, languages and literatures, natural and social sciences, psychology, and other areas. The college also has master's degree programs in biology, chemistry, and drama. The Frances Lehman Loeb Art Center houses one of the oldest art collections in the United States. Other facilities include an environmental nature centre and an observatory. Total enrollment is approximately 2,300.

The college was founded in 1861 by Matthew Vassar, but the American Civil War delayed its opening until 1865. It was then a college for women, dedicated to providing women with the high calibre of education previously only available to men. In 1898, Vassar became the first women's college to have a chapter of the Phi Beta Kappa honorary society. For a brief time following World War II, the college admitted a small number of male students (all of them being war veterans); however, a permanent coeducational policy was not in place until 1969. Noteworthy alumnae include poets Edna St. Vincent Millay (Millay, Edna St. Vincent) and Elizabeth Bishop (Bishop, Elizabeth), novelist Mary McCarthy (McCarthy, Mary), computer technology pioneer Grace Hopper (Hopper, Grace Murray), scientist Christine Ladd-Franklin (Ladd-Franklin, Christine), publisher Katherine Graham (Graham, Katharine), and actress Jane Fonda (Fonda, Jane).