History
Established in 1923
In 1885, the Sisters of Mercy started Mater Misericordiae, an academy for young ladies and boys under 12 years of age. The male boarding students remained at St. Anne Convent until 1923, when Waldron Academy for Boys was built. 

To meet the ever-evolving needs of students, significant growth and change has taken place within the historic walls of Waldron Mercy Academy through the years. By 1946, students no longer lived at the school. During the 1950's, in addition to the sisters, lay people joined the Waldron faculty in increasing numbers. Waldron started a preschool and Montessori program which enrolled both boys and girls. 

In September 1987, Waldron Academy for Boys and Merion Mercy Academy for Girls (lower school) officially merged and reopened as Waldron Mercy Academy.