The Cathedral of Saint Vibiana, often called St. Vibiana's, is a Catholic former cathedral church of the Archdiocese of Los Angeles. Located in Downtown Los Angeles, the building opened in 1876 as the cathedral for what was then known as the Diocese of Monterey–Los Angeles, and remained the official cathedral of the Los Angeles see for over 100 years.

The Archdiocese of Los Angeles is a Latin Church ecclesiastical territory or archdiocese of the Catholic Church located in the southern portion of the U.S. state of California. The archdiocese's cathedra is in Los Angeles, the archdiocese comprises the California counties of Los Angeles, Santa Barbara and Ventura. The cathedral is the Cathedral of Our Lady of the Angels in Los Angeles, and its present archbishop is José Horacio Gómez Velasco. With over five million professing members and weekly liturgies celebrated in 32 languages, the Archdiocese of Los Angeles is numerically the single largest and most ethnically diverse archdiocese in the United States.