William Gross, William Gros or Bill Gross may refer to:
William Hickley Gross (1837–1898), American member of the Congregation of the Most Holy Redeemer, prelate of the Roman Catholic Church William Gross (murderer) (1796–1823), last person publicly executed in Philadelphia William le Gros, Earl of York (died 1179), the Count of Aumale (Earl of Albemarle), Earl of York, and Lord of Holderness William Gros (born 1992), French football striker William G. Gross (born 1964), American police officer, former commissioner of the Boston Police Department Bill H. Gross (born 1944), American investor, fund manager, and philanthropist who co-founded Pacific Investment Management Company Bill T. Gross (born 1958), American businessman, founder of Idealab, GNP Audio Video and eSolar
See also William Grossart (1896–?), World War I flying ace Gross (surname)