William, Willie, or Billy Haynes may refer to:
William E. Haynes (1829–1914), United States Representative for Ohio William S. Haynes (1864–1939), American silversmith and flute maker William Haynes (swimmer) (), British swimmer Willie Haynes (1901–1981), American baseball player William Joseph Haynes Jr. (born 1949), United States federal judge Billy Jack Haynes (born 1953), American professional wrestler William J. Haynes II (born 1958), American lawyer, General Counsel of the U.S. Department of Defense William Haynes (comedian) (born 1993), comedian and internet personality