Ross School is a private Nursery-Grade12 school located on two campuses on Long Island, New York, United States—a 63 acre Upper School campus for Grades 6-12 in the Town of East Hampton, and a Lower School campus for N-Grade 5 in the Town of Bridgehampton. Named after her late husband Steven J. Ross, the school was founded in 1991 by Courtney Sale Ross as a girls-only day school for their daughter Nicole and several of her friends. The original pre-nursery program was discontinued in September 2020. Ross School transitioned to a co-ed boarding school in 2002 after its founder discontinued private funding. Students in grades 7-12 may board five days per week or full-time. The school has supplemented its budget by catering breakfast and lunch from its café to the Bridgehampton School and offering culinary arts and landscaping classes to East Hampton High School students.

A majority of the student body is international, with the highest-represented nations including Brazil, China, Japan, and Mexico.