The history of St. Mary's Church in Dedham, Massachusetts begins with the first mass said in Dedham, Massachusetts in 1843 and runs to the present day.
From the first mass with only 8 Catholics present, St. Mary's grew into one of the largest parishes in the Archdiocese of Boston. The first church constructed by the congregation was quickly outgrown, and so a second church was built on High Street. Designed to be a "cathedral in the wilderness," it is "the largest and most imposing church in the town" and "one of the most conspicuous edifices" in the town.
Several parishes have grown out of St. Mary's, most recently St. Susanna's. Today it has a large Life Teen program, and over 40 other programs for parishioners.