Joseph Sadoc Alemany y Conill, O.P. was a Spanish Catholic clergyman, who served most of his career in California. He served as the first Bishop of Monterey (1850–53) and then as Archbishop of San Francisco (1853–84). He was a member of the Dominican Order.

The Archdiocese of San Francisco is a Latin Church ecclesiastical territory or diocese of the Catholic Church in the northern California region of the United States. The Archdiocese of San Francisco was erected on July 29, 1853, by Pope Pius IX and its cathedral is the Cathedral of Saint Mary of the Assumption.