The Roman Catholic Diocese of Charleston is an ecclesiastical territory or diocese of the Roman Catholic Church in the southern United States and comprises the entire state of South Carolina, with Charleston as its see city. Currently, the diocese consists of 92 parishes and 24 missions throughout the state. It is led by the Most Rev. Robert Guglielmone, the Thirteenth Bishop of Charleston, who serves as pastor of the mother church, Cathedral of Saint John the Baptist in the City of Charleston. Its first bishop was John England. Charleston is a suffragan diocese of the Archdiocese of Atlanta.
The diocese was created from territories of the Archdiocese of Baltimore. The Diocese of Charleston was canonically erected on July 11, 1820 by Pope Pius VII making it the seventh oldest Roman Catholic diocese in the United States. At that time, the diocese comprised the states of Georgia, North Carolina, & South Carolina
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