The Cathedral of Saint Mary of the Assumption, colloquially known as Saint Mary's Cathedral, is a historic church located in Fall River, Massachusetts. It is the cathedral and a parish church in the Diocese of Fall River. Built from 1852 to 1856, the cathedral and adjacent rectory were added to the National Register of Historic Places in 1983, as St. Mary's Cathedral and Rectory. It is the oldest extant church building in the city of Fall River, and was one of the city's first Catholic parishes. The cathedral is dedicated to Mary, mother of Jesus under the title of Our Lady of the Assumption.