- William Smith (1697–1769) , father of John Smith, Doctor Thomas Smith, Joshua Hett Smith, and Chief Justice William Smith
- William Smith (actor) (born 1934)
- William Smith (boxer)
- William Smith (chief Justice) (1728–1793), historian, Chief Justice of the Province of New York, and Chief Justice of the Supreme Court of Canada
- William Smith (geologist) (1769–1839)
- William Smith (lexicographer) (1813–1893)
- William Smith (mariner) (born c. 1775, Fl. 1819–1820), British mariner and discoverer of the South Shetland Islands
- William Smith (Maryland) (1728–1814), United States representative from Maryland from 1789 to 1791
- William Smith (Mormonism) , also known as William B. Smith, younger brother of the founder of Mormonism, Joseph Smith, Jr., and a leader in the Latter Day Saint movement
- William Smith (South Carolina Representative) (1751–1837), United States representative from South Carolina from 1797 to 1798
- William Smith (South Carolina Senator) (1762–1840), United States senator from South Carolina from 1815 to 1830
- William Smith (swimmer)
- William Smith (Virginia) , United States representative from Virginia from 1821 to 1827
- William Alden Smith (1859–1932), United States representative from Michigan from 1895 to 1906 and United States senator from Michigan from 1905 to 1918
- William Alexander Smith (1828–1888), United States representative from North Carolina from 1873 to 1874
- Sir William Alexander Smith (Boys Brigade) (1854–1914), founder of the Boys' Brigade
- William Charles Smith (1877–1946), a.k.a. Razor Smith , cricket player from Surrey
- William E. Smith , Governor of Wisconsin from 1878 to 1882
- William "Extra Billy" Smith (1797–1887), Governor of Virginia (1846–1849, 1864–1865) and Confederate general
- William Ephraim Smith (1829–1890), United States representative for Georgia from 1875 to 1880
- William Farrar Smith , Union Army general
- William French Smith , United States Attorney General from 1981 to 1985
- William H. Smith , Governor of Alabama from 1868 to 1870
- William Harrison Smith , Medal of Honor winner in World War II
- William Jay Smith (1823–1913), United States representative from Tennessee from 1869 to 1870
- William Kennedy Smith (born 1960), Kennedy family scion, physician, acquitted of rape in 1991
- William Laird Smith , Australian representative for Denison from 1910 to 1922
- William Loughton Smith (1758–1812), United States representative from South Carolina from 1789 to 1798
- William Nathan Harrell Smith (1812–1889), United States representative from North Carolina from 1859 to 1860
- William Orlando Smith (1859–1932), United States representative from Pennsylvania from 1903 to 1906
- William Robert Smith (1863–1924), United States representative from Texas from 1903 to 1916
- William Robertson Smith (1846–1894), philologist, physicist, archaeologist, and Biblical critic
- William Russel Smith (1815–1896), United States representative from Alabama from 1851 to 1856
- William Stephens Smith (1755–1816), United States representative from New York from 1813 to 1816
may also be the name of:
- Amor De Cosmos (1825–1897), born William Alexander Smith, Premier of British Columbia
- William Smith (c. 1872–1941), Master of the SS Sauternes , English merchant seaman killed in World War II
also refers to:
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