The Baldwin School is an American all-girls independent school located in Bryn Mawr, Pennsylvania in Greater Philadelphia. Founded in 1888 by Florence Baldwin, it now consists of a Lower, Middle and Upper School totaling approximately 570 in enrollment. The school occupies a 19th-century resort hotel designed by Victorian architect Frank Furness, a landmark of the Philadelphia Main Line. The building was added to the National Register of Historic Places on April 27, 1979.