Stoneleigh-Burnham School (SBS) is an independent boarding and day school for girls in grades 7–12 and postgraduate. Founded in 1869, the school is a combination of five founding schools from New England, but resides today on a 100-acre (0.40 km2) campus in Greenfield, Massachusetts, United States, located in the Pioneer Valley. Stoneleigh-Burnham is affiliated with the National Coalition of Girls' Schools (NCGS), the National Association of Independent Schools, The Association of Boarding Schools and is accredited with the New England Association of Schools and Colleges.