William Hickley Gross, C.Ss.R., (June 12, 1837 – November 14, 1898) 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 the Diocese of Savannah in Georgia (1873–1885) and archbishop of the Archdiocese of Oregon City in Oregon (1885–1898).