Oldfields is accredited by AIMS Middle States Association of Colleges and Secondary Schools and approved by the Maryland State Department of Education. In addition, Oldfields is a member of the Association of Independent Maryland Schools, The Association of Boarding Schools, the National Association of Principals of Schools for Girls, the National Coalition of Girls' Schools, the Association of Supervision and Curriculum Development, the Secondary School Admission Test, the Independent Educational Consultants Association, the Educational Records Bureau, the Potomac and Chesapeake Association of College Admissions Counseling, and the National Association of College Admission Counseling. Oldfields recognizes the NAIS and NACAC Principles of Good Practice.