The Masters School, known as Masters, is a highly selective, prestigious, private, coeducational boarding school and day college preparatory school located in Dobbs Ferry, New York. Its 96-acre (390,000 m2) campus is located north of New York City on the Hudson Valley in Westchester County. Originally founded as an all-girls private school in 1877 by Eliza Bailey Masters, the school first admitted boys in 1996.