William Barnard

William Barnard may refer to:


 * William Barnard (bishop) (1697–1768), Anglican bishop of Raphoe and Derry
 * William Barnard (engraver) (1774–1849), English mezzotint engraver
 * William O. Barnard (1852–1939), U.S. Representative from Indiana
 * Bill Barnard (1886–1958), New Zealand lawyer and politician
 * William Stebbins Barnard (1849–1887), American biologist