At the very onset, the school was affiliated with the Catholic University of America. In 1925, Saint Gertrude was accredited by the Virginia State Board of Education and in 1942 by the Southern Association of Colleges and Schools. In 1978, the school became a member of the Virginia Association of Independent Schools. Saint Gertrude’s accreditation continues to be through VAIS and SACS, which are affiliated with the Virginia Council of Private Education. Saint Gertrude High School was awarded "Blue Ribbon School" designation in 1996.