St Mary’s College is a voluntary secondary school for girls, committed to the educational philosophy of the Sisters of Mercy. The school is operated under the trusteeship of CEIST [Catholic Education, An Irish Schools Trust].

A Board of Management (BOM), which is representative of  the school community, manages the school. This board is elected for a three-year term and meets approximately once a month. The BOM is comprised of eight members, two parent nominees, two teacher nominees and four Trustee nominees.

The day-to-day management of the school is carried out by the Principal, Deputy Principal and the senior leadership team.