This is a list of cathedrals in the state of California, United States:
A co-cathedral is a cathedral church which shares the function of being a bishop's seat, or cathedra, with another cathedral, often in another city. Instances of this occurred in England before the Protestant Reformation in the dioceses of 'Bath and Wells', and of 'Coventry and Lichfield'. These two dioceses were each named for both cities that served as bishop's seats.
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, and 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.
The San Gabriel Pastoral Region is a pastoral region of the Archdiocese of Los Angeles in the Roman Catholic Church. It covers the community of East Los Angeles through the San Gabriel and Pomona valleys in California.
The Holy Protection of Mary Byzantine Catholic Eparchy of Phoenix, commonly known as the Eparchy of Phoenix and formerly known as the Byzantine Catholic Eparchy of Van Nuys, is a Ruthenian Greek Catholic Church territory jurisdiction or eparchy of the Catholic Church in the western United States. Its episcopal see is Phoenix, Arizona. The last bishop was the Most Reverend John Stephen Pazak.
Chaldean Eparchy of Saint Peter the Apostle is a Chaldean Catholic Church eparchy of the Catholic Church in the Western United States. It practices the Syro-Oriental Rite in the Syriac/Arameic language. It is exempt, i.e. immediately subject to the Holy See, not part of any ecclesiastical province. Its cathedral episcopal see is St. Peter's Chaldean Catholic Cathedral, located in El Cajon, California.
Joseph Vincent Brennan is a prelate of the Catholic Church who has been serving as bishop of the Latin Church Diocese of Fresno in California since 2019. He previously served as an auxiliary bishop of the Archdiocese of Los Angeles in California from 2015 to 2019.
An ecclesiastical region is a formally organised geographical group of dioceses, ecclesiastical provinces or parishes, without a proper Ordinary as such, in Catholic or Protestant Churches.
St. Anne Melkite Greek Catholic Cathedral in the North Hollywood neighborhood of Los Angeles, is a modern cathedral inspired by Byzantine architecture. It is the co-cathedral church of the Melkite Greek Catholic Eparchy of Newton, which encompasses the entire United States.