William Hickley Gross, C.Ss.R., was an American prelate of the Roman Catholic Church who was a member of the Congregation of the Most Holy Redeemer. He served as Bishop of Savannah (1873–1885) and Archbishop of Oregon City (1885–1898).

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.