St. Paul's Choir School is a Catholic choir school located at St. Paul’s Church, Harvard Square in Cambridge, Massachusetts. Founded in 1963, by Theodore Marier, the middle school for boys in third through eighth grades is the only boys' choir school in the United States of America affiliated with the Roman Catholic Church, and one of the few church-affiliated choir schools in the United States. The Choir School educates and trains the choirboys who sing soprano in the choir of St. Paul's, a choir of boys and men. The choir sings for liturgical services at St. Paul's Church and performs primarily in and around the Boston area. It is located within the Archdiocese of Boston.