William Moore, and variations of William such as Will, Willie, Bill or Billy Moore, may refer to:
Artists and entertainers
Billy Moore (musician, born 1917) (1917–1989), American jazz musician
Billy Moore (musician, born 1931) (1931–2002), Guyana Caribbean musician
Wild Bill Moore (1918–1983), tenor saxophone player Expos
William Moore (critic) (1868–1937), Australian art critic and author
William Moore (musician) (1893–1951), American blues singer and guitarist
William Moore (actor) (1916–2000), British TV actor
William Moore (dancer) (1933–1992), African American dance critic, manager Eleo Pomare Dance Company
William Henry Moore (politician) (1872–1960), Canadian author and member of the Canadian House of Commons
William R. Moore (journalist) (1909/10–1950), war correspondent killed in the Korean War
Willie "Pdub" Moore Jr. (born 1978), actor and comedian
William Perry Moore III, American actor and musician
William Moore (painter) (1790–1851), English portrait painter
Bill Moore (painter) (1949–2020), American painter
Businesspeople
William Moore (banker) (1914–2009), chairman of the board, Bankers Trust
William Dalgety Moore (1835–1910), Western Australian businessman
William H. Moore, soldier, businessman and founder of the Mystic Copper Mine and Elizabethtown, New Mexico
William H. H. Moore (1824–1910), American lawyer and insurance executive
Military people
William Moore (Medal of Honor) (1837–1918), American Civil War sailor and Medal of Honor recipient
Bill Moore (British Army officer) (born 1958), British general
William Moore (loyalist) (1949–2009), Northern Irish loyalist paramilitary and Shankill Butcher
William G. Moore Jr. (1920–2012), U.S. Air Force general
Sir William George Moore (British Army officer) (1795–1862)
Sir William James Moore (1828–1896), surgeon-general and honorary physician to Queen Victoria
Politicians and judges
Bill Moore (Queensland politician) (1897–1976), member of the Queensland Legislative Assembly for Merthyr from 1940–1957
William Moore (Ardee MP) (c. 1685–1732), member of the Parliament of Ireland for Ardee 1715–27
William Moore (Clogher MP) (1743–1810), member of the Parliament of Ireland for Clogher, Clonmel and St Johnstown
Sir William Moore, 1st Baronet (1864–1944), Irish politician and judge
Sir William Moore, 2nd Baronet, Anglo-Irish politician
William Robert Moore (1830–1909), American politician, U.S. representative from Tennessee
William S. Moore (1822–1877), American lawyer and politician, U.S. congressman from Pennsylvania
William J. Moore (1923–2015), American politician, Pennsylvania state senator 1973–1988
Henson Moore (William Henson Moore III, born 1939), American lawyer and politician, U.S. representative from Louisiana
William Moore (Banbury MP) (1699–1746), British politician, member of parliament for Banbury
William Moore (1699–1783), United States landowner, politician and jurist; builder of Moore Hall
William Moore (Pennsylvania politician, died 1793) (c.1735–1793), jurist and politician, president (i.e. governor) of Pennsylvania
William Moore (New Jersey politician) (1810–1878), American politician, U.S. representative from New Jersey
William Campbell Moore (1923–1982), politician in British Columbia, Canada
William Henry Moore (financier) (1848–1923), among founders, U.S. Steel, corporate director
William A. Moore (North Carolina politician) (1831–1884), American lawyer, judge, confederate officer and politician
William A. Moore (Illinois politician), member of the Illinois House of Representatives
William L. Moore (Virginia politician) (1851–1926), American politician, member of the Virginia House of Delegates
William O. Moore (1841–1913), American politician in the Virginia House of Delegates
William Theodore Moore Jr. (born 1940), American lawyer, U.S. federal judge
William T. Moore (Texas politician) (1918–1999), American politician, president pro tempore of the 55th Texas legislature
William Moore (Wisconsin politician) (1886–1961), Wisconsin state assemblyman
William Henry Moore (Australian solicitor) (1788–1854), English-Australian solicitor
William Moore (Australian politician) (1823–1914), of both Tasmanian houses of parliament
William Moore (Queensland politician) (1866–1933), of Queensland Legislative Assembly
William Sturge Moore (died 1809), political figure in Lower Canada
William Vail Moore (1818–?), Wisconsin state assemblyman
William W. Moore (c. 1832–?), Florida representative
William Hickman Moore (1861–1946), American politician in Seattle, Washington
W. F. Moore (William Folsom Moore, 1868–1956), justice of the Supreme Court of Texas
Sportspeople
Football
Bill Moore (American football) (1912–1973), American football player