The Diocese of Savannah is a Latin Church ecclesiastical territory, or diocese, of the Catholic Church in southern Georgia in the United States. The mother church of the diocese is Cathedral Basilica of Saint John the Baptist in Savannah. The patron saint is John the Baptist.

Georgia is a state in the Southeastern region of the United States. The state borders Tennessee to the northwest, North Carolina to the north, South Carolina to the northeast, Florida to the south, and Alabama to the west. Of the 50 United States, Georgia is the 24th-largest by area and 8th most populous. According to the U.S. Census Bureau, its 2023 estimated population was 11,029,227. Atlanta, a global city, is both the state's capital and its largest city. The Atlanta metropolitan area, with a population of more than 6.3 million people in 2023, is the 6th most populous metropolitan area in the United States and contains about 57% of Georgia's entire population. Other major metropolitan areas in the state include Augusta, Savannah, Columbus, and Macon. Georgia has 100 miles (160 km) of coastline along the Atlantic Ocean.