William Clark (1770–1838) was an American soldier and explorer; governor of Missouri Territory.

William Clark may also refer to:

• W. H. Clark (brewer) (William Henry Clark, c. 1815–c. 1870), brewer in South Australia
• William Bell Clark (1889–1968), American advertising executive and naval historian
• William Clark (stockbroker), Australian financier and racehorse owner in London

• Bill Clark (screenwriter) (born 1944), former New York Police Department detective and television writer
• William Clark (artist) (1803–1883), Scottish marine painter
• William Andrews Clark Jr. (1877–1934), American violinist and founder of the Los Angeles Philharmonic
• Bill Clark (musician) (1925–1986), American jazz drummer
• Billy C. Clark (1928–2009), American author

• William A. Clark (soldier) (1828–1916), American Civil War soldier and Medal of Honor recipient
• William Philo Clark (1845–1884), U.S. Army officer
• William Leon Clark (1911–2005), Deputy Chief of Chaplains of the U.S. Air Force

• William George Clark (politician) (1865–1948), Canadian politician
• William Harold Clark (1869–1913), Canadian politician in Alberta
• William Mortimer Clark (1836–1915), Canadian politician
• Keir Clark (William Keir Clark; 1910–2010), Canadian merchant and political figure in Prince Edward Island

• William D. Clark (1916–1985), economist and first director of the Overseas Development Institute
• William Clark, Baron Clark of Kempston (1917–2004), British politician (MP for Croydon South)
• William Henry Clark (1876–1952), British civil servant and diplomat
• William Moore Wallis Clark (1897–1971), Ulster Unionist member of the Senate of Northern Ireland

• William Clark (merchant) (1670–1742), merchant and town official in Boston, Massachusetts
• William Clark (congressman) (1774–1851), US Congressman from Pennsylvania and U.S. Treasurer
• Billy J. Clark (1778–1866), American physician and politician from New York
• William Clark Jr. (1798–1871), American politician and signatory to the Texas Declaration of Independence
• William Clark Jr. (diplomat) (1930–2008), former United States Ambassador to India
• William Clark (Montgomery County, NY) (1811–1885), New York politician
• William A. Clark (1839–1925), copper baron and United States Senator from Montana
• William A. Clark (Maryland politician) (born 1958), American politician from Maryland
• William G. Clark (1924–2001), American jurist and politician
• William G. Clark Jr. (1912–1990), American jurist and politician in Massachusetts
• William P. Clark Jr. (1931–2013), American politician, and United States Secretary of the Interior
• Ramsey Clark (William Ramsey Clark; 1927–2021), American politician, United States Attorney General
• William Thomas Clark (1831–1905), American soldier and Congressman from Texas, 1869–1872
• William Walter Clark (1885–1971), American politician from Wisconsin
• William White Clark (1819–1883), Confederate politician

• William Clark (priest) (died 1603), English Roman Catholic priest and conspirator
• William Clark (bishop) (died 1925), Canadian Anglican bishop
• William Hawley Clark (1919–1997), bishop of the Episcopal Diocese of Delaware
• William Robinson Clark (1829–1912), Canadian theologian
• William Clark (Anglican), Massachusetts cleric

• William Andrew Clark (1911–1983), British botanist
• William Bullock Clark (1860–1917), American geologist
• William Inglis Clark (1855–1932), Scottish pharmaceutical chemist
• William J. Clark, Scottish orthodontist

• Bill Clark (American football) (born 1968), retired college football coach
• Bill Clark (Australian footballer) (1922–2015), Australian rules footballer
• Bill Clark (rugby union) (1929–2010), New Zealand rugby player
• Billy Clark (footballer, born 1881) (1881–1937), Scottish football player
• Billy Clark (footballer, born 1967), English football player
• Billy Clark (footballer, born 1991), English football player
• William Clark (football manager), Scottish football manager
• William Dennison Clark (1885–1932), American football player
• William Clarke (footballer, fl. 1897–1900), football player for Lincoln City and Aberdeen F.C.
• Willie Clarke (footballer) (1878–1940), born William Clark, Scottish football player for Aston Villa, Bradford and Bristol Rovers

• William Clark (archer) (1842–1913), American Olympic archer
• William Clark (boxer) (1899–1988), American boxer who competed in the 1920 Summer Olympics
• William Clark (skier) (1910–1975), Canadian skier and Olympic competitor
• Will Clark (William Nuschler Clark, Jr., born 1964), American professional baseball player
• Bill Clark (basketball) (born 1988), American basketball player

• William Clark (anatomist) (1788–1869), Professor of Anatomy at Cambridge University
• William George Clark (1821–1878), British scholar of Shakespearean literature
• William S. Clark (1826–1886), American agricultural scientist and educator at University of Massachusetts
• William W. Clark (born 1940), professor of art history
• William C. Clark (born 1948), American ecologist and environmental policy analyst
• William A. V. Clark (born 1938), professor of geography
• William Mansfield Clark (1884–1964), American chemist

• William Tierney Clark (1783–1852), English engineer and bridge designer
• William Clark (inventor) (1821–1880), British civil engineer and inventor
• William Nairne Clark (1804–1854), public notary and publisher in Australia
• William Ovens Clark (1849–1937), barrister and judge in British India
• William Clark (judge) (1891–1957), American federal judge

• William Clarke (disambiguation)
• William Clark Jr. (disambiguation)
• William H. Clark (disambiguation)
• Will Clark (disambiguation)
• Willie Clark (disambiguation)
• William Clerk (disambiguation)

Topics referred to by the same term

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