William Harrison
William Harrison may refer to:
- William Harrison (author) (born 1933), author of "Roller Ball Murder" and the screenplay for Rollerball
- William Harrison (Canadian politician) (1834–1922), saddlemaker, historian and reeve of Richmond Hill, Ontario
- William Harrison (clergyman) (1534–1593), English clergyman
- William Harrison (cricketer) (died 1939), English cricketer
- William Harrison (cricketer, born 1866) (1866–1936), English cricketer
- William Harrison (merchant navy officer) (1812–1860), British merchant navy officer
- William Harrison (physician) (1935–2010), American obstetrician
- William Harrison (Welsh footballer) (1872–1920), Wrexham F.C. and Wales international footballer
- William Harrison, Jr. (c.1750–1789), delegate for Maryland in the U.S. Continental Congress of 1786 and 1787
- William Alistair Harrison (born 1954), Governor of Anguilla
- William B. Harrison (1889–1948), mayor of Louisville, Kentucky
- William B. Harrison, Jr. (born 1943), chairman and CEO of JP Morgan Chase
- William C. Harrison, chairman of North Carolina board of education
- William Ewart or Billy Harrison (1886–1948), English football player
- William Greer Harrison (1836–1916), member of the Committee of Fifty after the 1906 San Francisco earthquake
- William H. Harrison (Wyoming Congressman) (1896–1990), American politician who served as a Republican U.S. representative from Wyoming
- William Henry Harrison (1773–1841), ninth President of the United States
- William Henry Harrison (businessman) (1892–1956), American general and businessman
- William Henry Harrison (New Zealand) (1831–1879), New Zealand politician
- William Kelly Harrison (1870–1928), United States Navy officer and Medal of Honor recipient
- William Leeming Harrison (1897–1960), Canadian fighter ace in World War I
- William P. Harrison (1830–1895), Methodist minister and theologian, Chaplain of the United States House of Representatives
- William Thomas Harrison (1837–1920), Anglican priest
- "Victim" of a 1660 murder found alive two years later; see The Campden Wonder