The Holliston Historical Society is a non-profit organization dedicated to keeping Holliston's historical character intact. As stated in its bylaws, the mission of the Society is to "study, collect, and preserve historical records, traditions, and relics relating to the history of Holliston and its people; to promote the study of local conditions; to interest and unite the townspeople in a finer public spirit and a better social order, through the fuller understanding of the traditions and history of our town."

The Society is governed by a Board of Directors and Executive Officers. Directors and Officers are nominated by committee and are elected at the year's end meeting in June. Their two-year terms begin in the fall. They oversee use of the property, collections, financial obligations, programs, and even have time for planning and attending social events.

The Society provides a unique opportunity for community fellowship due to the fact that it is one of the few organizations which includes in its membership people of all ages and all interests. New members are always welcome