William Byron may refer to:
William Byron, 3rd Baron Byron (1636–1695), British peer and great-great-grandfather of poet George Gordon Byron William Byron, 4th Baron Byron (1669–1736), British peer and great-grandfather of poet George Gordon Byron William Byron, 5th Baron Byron (1722–1798), British peer and great-uncle of poet George Gordon Byron William D. Byron (1895–1941), Democratic member of U.S. Congress 1939–1941 from Maryland's 6th congressional district William Byron (racing driver) (born 1997), American race car driver William J. Byron (1927–2024), priest of the Society of Jesus Lord Byron (umpire) (1872–1955), American baseball umpire William Byron (MP) (1749–1776), British politician
See also William Byron Rumford (1908–1986), California legislator