Marymount is an Association Loi 1901 according to French law and is governed by a Board of Trustees. The Board is overseen by the Religious of the Sacred Heart of Mary. The Board consists of religious sisters of the Sacred Heart of Mary and lay members. 

The Chairman of the Board of Trustees is David Newman. The Board's membre de droit is Catherine Patten RSHM, Provincial Superior. The Board of Trustees function is similar to a committee overseeing a corporation and it is responsible for setting policy, regulating the school's financial health and appointing the Head of School. The Board is not responsible for the daily operation or management of the school which is left in the capable hands of the school's leadership team.