Humberto Sousa Medeiros, GCIH was a Portuguese-American clergyman of the Roman Catholic Church. He served as Archbishop of Boston from 1970 until his death in 1983, and was created a cardinal in 1973. An ecclesiastical conservative, Cardinal Medeiros was considered a champion of the immigrant worker, the poor and minorities.

The Archdiocese of Boston is a Latin Church ecclesiastical territory, or archdiocese, of the Catholic Church in eastern Massachusetts in the United States. Its mother church is the Cathedral of the Holy Cross in Boston. The archdiocese is the fourth largest in the United States. As of 2023, the archbishop of Boston is Cardinal Seán Patrick O'Malley.