St. Mary's School and all Archdiocese of Washington Schools are AdvancEd Accredited Schools. The Archdiocese of Washington maintains system wide accreditation having met the requirements established by the AdvandEd Accreditation Commission and the Board of Trustees through the Southern Association of Colleges and Schools Council on Accreditation and School Improvement. This distinction is the result of extensive self-study, ongoing evaluation, and continual striving for academic excellence.