John Joseph Mitty was an American prelate of the Roman Catholic Church. He served as the third Bishop of Salt Lake City (1926–1932) and the fourth Archbishop of San Francisco (1935–1961).

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.