Walnut Hill School is a private, coeducational, boarding and day high school for the arts, for grades 9–12 (ages 13–18). In conjunction with intensive arts training in ballet, music, theater, visual art, and writing, Walnut Hill offers comprehensive and rigorous academic curriculum in all college-preparatory subjects.

Located 17 miles (27 km) west of Boston, the beautiful 45 acre (180,000 m²) Walnut Hill campus is in a residential neighborhood in Natick, Massachusetts.

Founded in 1893, by Wellesley College graduates Florence Bigelow and Charlotte Conant, Walnut Hill School was at the forefront of education for young women for more than 80 years. Even as a traditional private boarding school for girls, Walnut Hill had a strong arts program. Walnut Hill was home to acclaimed Fenway Studio artist and teacher Miriam Pooke , and also counts Pulitzer Prize–winning author Elizabeth Bishop '30 among its graduates.

In the late 1970’s, Walnut Hill became a coeducational school and expanded its mission as a school for the visual and performing arts. In 1988, Walnut Hill became the first school in the United States to have an affiliation with a major conservatory of music. The New England Conservatory at Walnut Hill is the nation's premier music education model for high school students.