William, Willie, Will, Bill, or Billy Smith may refer to:

• William Smith (Master of Clare College, Cambridge) (1556–1615), English academic
• William Smith (antiquary) (c. 1653–1735), English antiquary and historian of University College, Oxford
• William Smith (scholar) (1711–1787), English classical scholar and Anglican Dean of Chester
• William Smith (Episcopal priest) (1727–1803), Scottish-born first provost of University of Pennsylvania
• William Pitt Smith (1760–1796), American physician, educator and theological writer
• William Andrew Smith (1802–1870), American college president and clergyman
• William Smith (lexicographer) (1813–1893), English editor and publisher of dictionaries
• William Robertson Smith (1846–1894), Scottish philologist, physicist, archaeologist and Biblical critic
• William Benjamin Smith (1850–1934), American professor of mathematics at Tulane University
• William Ramsay Smith (1859–1937), Australian anthropologist
• William George Smith (1866–1918), Scottish psychologist
• William Hall Smith (1866–after 1920), President of Mississippi Agricultural and Mechanical College, 1916–1920
• William Cunningham Smith (1871–1943), American academic of English literature, university administrator and writer
• William Roy Smith (1876–1938), American academic historian
• William Charles Smith (1881–1972), English musicologist
• William Newton-Smith (1943–2023), Anglo-Canadian philosopher of science

• William "Gentleman" Smith (1730–1819), English stage star
• William Henry Smith (1806–1872), American author of 1844 temperance play The Drunkard
• William Smith (actor) (1933–2021), American character performer
• William Smith (17th-century actor) (died 1696), British actor
• William Smith (teacher) (born 1939), South African television science and mathematics presenter
• Will Smith (comedian) (born 1971), English actor and writer

• William Henry Smith (1792–1865), entrepreneur whose business was about both newsagents and book shops
  • William Henry Smith (1825–1891), son of the above, and politician
• William Smith (businessman) (1818–1912), nurseryman and donor to Hobart and William Smith Colleges
• William Reardon Smith (1856–1935), British shipowner
• Willie Reardon Smith (1887–1950), British shipowner
• William Wensley Smith (1887–1955), founder of W. W. Smith Insurance Ltd

• Sir William Cusack-Smith, 2nd Baronet (1766–1836), baronet
• William A. Smith (Iowa judge) (1870–1958), justice of the Iowa Supreme Court
• William A. Smith (Kansas judge) (1888–1968), Associate Justice of the Kansas Supreme Court
• William E. Smith (judge) (born 1959), judge on the United States District Court for the District of Rhode Island
• Sir William James Smith (1853–1912), British judge who served as the chief justice of the Supreme Court of Cyprus, British Guiana and the Transvaal
• William Francis Smith (1904–1968), judge of the United States Court of Appeals for the Third Circuit
• William Kennedy Smith (born 1960), physician and Kennedy family scion who was acquitted of rape in 1991
• William Nimmo Smith, Lord Nimmo Smith (born 1942), former Senator of the College of Justice and a judge of the Supreme Courts of Scotland
• William Owen Smith (1848–1929), lawyer involved in overthrow of the Kingdom of Hawaii
• William Redwood Smith (1851–1935), Associate Justice of the Kansas Supreme Court
• William Scott Smith (born 1959), American serial killer and kidnapper
• William Smith (judge, born 1728) (1728–1793), historian, Chief Justice of the Province of New York, and Chief Justice of the Province of Quebec and later Lower Canada
• William Smith (judge, born 1697) (1697–1769), father of John Smith, Doctor Thomas Smith, Joshua Hett Smith, and Chief Justice William Smith
• William Smith (murderer) (1957–2005), executed by the State of Ohio in 2005
• William "Tangier" Smith (1655–1705), Chief Justice of the Province of New York from 1692
• William Trickett Smith (1937–2021), American lawyer who was disbarred
• William Trickett Smith II (born 1981), his son, American drug trafficker convicted of murdering his wife in Peru in 2007

• Sir Sidney Smith (Royal Navy officer) (William Sidney Smith, 1764–1840), British admiral
• William Smith (1746–1787), commanding officer of the Lincoln minutemen in the battles of Lexington and Concord
• William Alexander Smith (Boys' Brigade) (1854–1914), founder of the Boys' Brigade
• William Danvers Smith, 2nd Viscount Hambleden (1868–1928), known as Frederick Smith, officer in the British Army
• William Douglas Smith (1865–1939), British general
• William D. Smith (1933–2020), United States Navy admiral
• William Duncan Smith (1825–1862), career United States Army officer
• William Farrar Smith (1824–1903), Union Army general
• William F. Smith (US Army Air Corps), piloted the US Army Air Corps B-25 Billy Mitchell Bomber that crashed into the Empire State Building
• William H. Smith (Medal of Honor) (1847–1877), American Indian Wars soldier and Medal of Honor recipient
• William James Lanyon Smith, New Zealand naval officer
• William Osborne Smith (1833–1887), first Acting Commissioner of the North West Mounted Police
• William Ruthven Smith (1868–1941), United States Army officer
• William Smith (c. 1872–1941), Master of the SS Sauternes, English merchant seaman killed in World War II
• William Smith (Medal of Honor, 1864) (1826–?), American Civil War sailor and Medal of Honor recipient
• William Smith (Medal of Honor, 1869) (1838–?), American Indian Wars soldier and Medal of Honor recipient
• William Smith (Royal Navy officer) (died 1756), served as Commander-in-Chief of the Jamaica Station and rose to Rear Admiral
• William Smith (ship captain) (1768–1846), American ship captain and Revolutionary War veteran
• William Smith (Virginia governor) (1797–1887), Governor of Virginia (1846–1849, 1864–1865) and Confederate general
• William Sooy Smith (1830–1916), American Civil War general
• William Thomas Smith (1896–1994), World War I flying ace
• William Watson Smith (1892–?), World War I flying ace
• William W. Smith (admiral) (1888–1966), United States Navy admiral during World War II
• William Y. Smith (1925–2016), United States Air Force general

• William Smith (minister) (died 1647), buried in the Prophet's Grave near Largs, North Ayrshire, Scotland
• William Smith (Archdeacon of Armagh) (died 1673), English priest in Ireland
• William Smith (Provost of St Andrew's Cathedral, Aberdeen), 18th-century Scottish priest
• William Smith (Latter Day Saints) (1811–1893), younger brother of Joseph Smith, Jr. and himself a Mormon leader
• William Smith (bishop) (1819–1892), Catholic archbishop of St. Andrews and Edinburgh
• William R. Smith (Mormon) (1826–1894), Mormon leader in Davis County, Utah Territory
• William Saumarez Smith (1836–1909), Anglican bishop/archbishop of Sydney
• William Smith (monsignor) (1939–2009), Catholic theologian
• William Carr Smith (1857–1930), Church of England clergyman
• William Angie Smith (1894–1974), bishop of the Methodist Church and the United Methodist Church

• Bill Smith (Motorola engineer) (1929–1993), one of the creators of Six Sigma
• William Gardner Smith (botanist) (1866–1928), Scottish botanist and ecologist
• William Smith (architect) (1817–1891), Scottish architect
• William Smith (geologist) (1769–1839), English geologist
• William Wright Smith (1875–1956), Scottish botanist and horticulturalist
• W. Wheeler Smith (c. 1838–c. 1908), American architect and real estate developer

• William Smith (conservationist) (1852–1942), New Zealand gardener, naturalist and conservationist
• William Smith (shearer) (1896–1947), perhaps the most skilled sheep-shearer in the first half of the 20th century
• William Smith (mariner) (1790–1847), British mariner and discoverer of the South Shetland Islands
• William Smith (physician), Scottish American physician
• William Smith (registrar) (1816–1895), Ghanaian civil servant
• William Crawford Smith (1837–1899), American architect
• William R. Smith (physician) (born 1973), American emergency physician and wilderness medicine consultant
• William Robert Smith (physician) (1850–1932), British public health expert
• William Tyler Smith (1815–1873), English obstetrician, medical writer and journalist
• William Wragg Smith (1808–1875), American planter, lawyer, naturalist, translator and poet

• Hobart and William Smith Colleges, a private liberal arts college in Geneva, New York
• William Smith House (disambiguation), several buildings
• Billy Ray Smith (disambiguation)
• Willard Smith (disambiguation)
• William Smyth (disambiguation)
• William Smythe (disambiguation)
• William Schmidt (disambiguation)
• Wilhelm Schmidt (disambiguation)
• List of people with surname Smith
• All pages with titles beginning with William Smith
• All pages with titles containing William Smith

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