The Cathedral of Saint Paul — informally known as Saint Paul's Cathedral — is the mother church of the Roman Catholic Diocese of Worcester in Worcester, Massachusetts. The Gothic structure was designed by architects E. Boyden & Son. Construction began in the spring of 1868; the superstructure was completed by 1874, at which time the church was dedicated. The building is 168 feet in length, 91 feet in width, and 96 feet in height.