Marymount International School is an independent day and boarding school for girls in Kingston upon Thames, London, England. Founded by the Religious of the Sacred Heart of Mary in 1955 it is open to children of all faiths or none. It is situated on a 7-acre campus 12 miles from central London. Marymount is a fully accredited IB World School and is also accredited by the Council of International Schools and the Middle States Association of Colleges and Schools (USA). It is a member of the Girls' Schools Association.