The Madeira School is a private, non-denominational preparatory boarding school for girls located in McLean, Virginia, United States. Originally located on 19th Street near Dupont Circle in Washington, D.C., it was founded by Lucy Madeira Wing (1873-1959) in 1906 and moved to the Northern Virginia suburb of McLean in 1931. Famous graduates include Stockard Channing, Penny Chenery, Katharine Graham, Frances Sternhagen, and Alice Rivlin. It is also the location of Camp Greenway during the summer and portions of the campus are used by the outdoor adventure company Inner Quest.

Annual tuition is $46,160 for boarding students and $35,050 for day students. Tuition does not include additional fees charged by the school for athletics, books, and other expenses. Madeira's endowment is approximately $55 million.

The Madeira School has had a proud though sometimes troubled history. In 1918 Madeira was quarantined during the Spanish Flu and, like many schools, closed for a month. The students raised money for hospitals and the Armenian Fund. In 1929 the school was incorporated and plans for the Greenway campus began and in 1931 the new campus opened. In 1966 the first two African American women students were admitted to the school and the same year the co-curriculum program began. In 1967 Langston Hughes gave a lecture and held informal discussion with the students. This initiated the Skallerup lecture series. In 1973 a Madeira student was murdered on campus and Stephen Gilreath was convicted of the murder. In 1975 the new science building was completed and Nobel Prize winner James D. Watson spoke at the dedication. In 1980 the then Head Mistress Jean Harris was arrested for the murder of Dr. Herman Tarnower.