Mount de Sales Academy is an all-girls secondary school located in Catonsville in unincorporated Baltimore County, Maryland.

Mount de Sales Academy was founded in 1852 by the Visitation Sisters as a boarding school for girls.

The campus also includes the Center for Performing Arts and Student life (opened in 2021), athletic fields, a convent, and a gymnasium.

The main building, which is listed on the National Register of Historic Places, retains architectural traces of the cloistered sisters of the Visitation Order who founded the school.

[5] The building also includes the Music Hall, which has details such as trompe-l'œil painting and is where graduation is held annually, the Padre Pio library, which contains relics of that saint and a mosaic in his honor, computer labs, a spacious art studio, the Ramona Carrigan Science Center, research lab, and newly added STEM and robotics rooms.

The facility is located across from the main building, on a piazza featuring gardens and a bronze statue of Saint Joseph the Worker.