NCS is directed by a Governing Board composed of parents, alumnae, and other friends of the School. Seven members serve ex officio: the bishop of Washington, the head of school, two representatives elected by the NCS faculty, the president of the NCS Alumnae Association, the president of the NCS Parents Association, and a member of the Cathedral Chapter. 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.