The Diocese of Salt Lake City is a Latin Church diocese of the Catholic Church for the State of Utah in the United States. It is a suffragan diocese, formerly of the metropolitan Archdiocese of San Francisco and, since May 30, 2023, of the Archdiocese of Las Vegas.

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.