NCS is directed by a Governing Board composed of parents, alumnae, and other friends of the School. Six members serve ex officio: the bishop of Washington, the Head of School, two representatives elected by the NCS faculty, a representative of the NCS Alumnae Advisory Group, and the president of the NCS Parents Association. The remaining members are elected by the Board and serve three-year terms.
The Governing Board entrusts the administration of the school to the Head of School. Primary responsibility for the well-being of the school rests with the Board. Its tasks include:
- establishing policy for the educational affairs of the institution;
- selecting and evaluating the Head of School; and
- ensuring sound fiscal management, adequate philanthropic support, and wise conservation of the school's assets and physical plant.