Mount Calvary's Home and School Association is a parent organization that supports and enhances the educational ministry of the school. All parents, faculty and staff are members. General meetings provide opportunities for parents to hear speakers on pertinent  issues and to take part in business and community-related activities. All parents are required to attend General Meetings.

A strong emphasis is placed on promoting service, volunteerism and fundraising activities. Active participation of all members is required through support of activities and attendance at meetings.

All adults who have substantial contact with children and who volunteer in the school or for approved school and parish sponsored activities must comply with the Child Protection Policy of the Archdiocese of Washington.

The Executive Committee of the HSA exists to help set direction for and facilitate activities and events.