William Haynes

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) (fl. 1905–1912), 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