William or Will or Willie Harris may refer to:
Politicians and political activists
- William Harris (born 1504) (1504–?), MP for Newport, Cornwall
- William Harris (died 1556), MP for Maldon
- William Harris (MP, died 1709) (c. 1652–1709), English landowner and member of parliament for St Ives, and for Okehampton
- William Harris (Birmingham Liberal) (1826–1911), Liberal Party politician and strategist, architect, and writer, in Birmingham, England
- William Harris (civil rights leader) (1867–1931), Australian advocate for Aboriginal rights
- William Harris (Symbionese Liberation Army), 20th century American militant
- William Alexander Harris (Kansas politician) (1841–1909), U.S. Representative from Kansas
- William Alexander Harris (Virginia politician) (1805–1864), U.S. Representative from Virginia
- William C. Harris (Illinois politician) (1921–2004), American politician
- William J. Harris (1868–1932), U.S. Senator from Georgia
- William Littleton Harris (1807–1868), Justice of the Mississippi Court of Errors and Appeals
- William L. Harris (1923–2013), American politician
- William James Harris (1835–1911), Conservative Party politician
- William R. Harris (1803–1858), justice of the Tennessee Supreme Court
- William Harris (New York politician), American businessman and politician from New York
Sportsmen
- William Harris (American football) (1965–2014), American football tight end
- Will Harris (American football), American football cornerback
- Bill Harris (swimmer) (1897–1961), American swimmer and Olympic bronze medallist
- William Harris (tennis) (1947–2002), American tennis player
- William Harris (cricketer, born 1861) (1861–1923), English cricketer
- William Harris (cricketer, born 1864) (1864–1949), English cricketer
- William Harris (cricketer, born 1883) (1883–1967), English cricketer
- William Harris (footballer) (1890–?), Scottish footballer
- William Harris (rugby union) (1876–1950), New Zealand rugby union player
- Will Harris (baseball) (born 1984), baseball player
- Willie Harris (born 1978), baseball player
- Will Harris (rugby union) (born 2000), Australian rugby union player
- Will Harris (footballer) (born 2000), English footballer
Academics and religious figures
- William Harris (Presbyterian minister) (1675?–1740), English divine
- William Harris (historian) (1720–1770), English dissenting minister and historian
- William Harris (academic) (1765–1829), president of Columbia University
- William C. Harris (historian), professor of history at North Carolina State University
- William Logan Harris (1817–1887), Bishop of the Methodist Episcopal Church
- William Henry Harris (academic) (1884–1956), Welsh divine, canon and treasurer of St David's Cathedral, and professor of Welsh at St David's College, Lampeter
- William Stewart Harris (1922–1994), English-born Australian anthropologist, journalist and Aboriginal rights advocate
- William V. Harris (born 1938), professor of history
- William Wadé Harris (c. 1860–1929), African evangelist
- William S. Harris, American professor and researcher on human nutrition
Soldiers
- William Harris (colonist) (1757–1812), figure in the American Revolution
- William Harris, 2nd Baron Harris (1782–1845), British soldier and peer
- William Harris, American Civil War colonel, son of Ira Harris
- William W. Harris (Medal of Honor) (1850–1878), Medal of Honor recipient for action in the Indian Wars
- William Frederick Harris (1918–1950), United States Marine Corps officer
Engineers, inventors and scientists
- William Cornwallis Harris (1807–1848), English military engineer, artist and hunter
- Sir William Gordon Harris (1912–2005), British civil engineer
- William Snow Harris (1791–1867), invented a ship-borne lightning rod
- William Harris, former director general of Science Foundation Ireland
Others
- Will Harris (poet) (born 1989), British poet
- William Harris (beachcomber) (c. 1813–1889), British escaped convict and settler in pre-colonial Nauru
- William Harris (musician) (fl. 1927–1928), American country blues guitarist, singer, and songwriter
- William Harris (theatrical producer) (1844–1916), American theatre producer and vaudevillian performer
- William Harris (Tudor person) (1556–1616), English knight, landowner and incorporator in the third Virginia Company of London
- William Harris (settler) (1610–1681), founding settler of Providence, Rhode Island
- William Harris, 6th Earl of Malmesbury (1907–2000), British peer
- Bill Harris (neuroscientist) (born 1950), Canadian-born neuroscientist
- William Critchlow Harris (1854–1913), Canadian architect
- William C. Harris (police officer), Assistant Commissioner of the Metropolitan Police, 1856–1881
- Sir William Henry Harris (1883–1973), English organist and composer
- William H. Harris (orthopaedic surgeon) (born 1927), American orthopaedic surgeon
- William Laurel Harris (1870–1924), American muralist and editor
- William Lewarne Harris (1929–2013), English composer
- William Torrey Harris (1835–1909), United States Commissioner of Education, American educator, philosopher, lexicographer
- William Harris Jr. (1884–1946), Broadway theatrical producer
- William Harris, founder of the Ottawa Citizen newspaper
- William Bevan Harris, British-American comic actor, better known as Billy Bevan
See also
- Bill Harris (disambiguation)
- William Harries (disambiguation)
- William Hamlyn-Harris (born 1978), Australian javelin thrower
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