William Williams may refer to:
Authors and artists
- William Williams (artist) (1727–1791), artist, author of first American novel, Penrose
- William Joseph Williams (1759–1823), his son, artist; painted George Washington, John Adams and Thomas Jefferson
- William Williams (Crwys) (bardic name, "Crwys") (1875–1968), Welsh language poet, three-time winner of the Crown at the National Eisteddfod of Wales and Archdruid
- William Appleman Williams (1921–1990), American historian
- William Carlos Williams (1883–1963), American poet
- Sir William Emrys Williams (1896–1977), British educationalist and Editor-in-Chief of Penguin Books, 1936–1965
Military figures
Politicians
- Sir William Williams, 1st Baronet, of Gray's Inn (1634–1700) — Welsh lawyer & politician, speaker of the House of Commons
- William Williams (Australian politician), Australian politician
- Sir William Williams, 2nd Baronet, of Gray's Inn (c. 1665–1740), Welsh politician, Member of Parliament (MP) for Denbigh, 1708–1710
- William Peere Williams (1664-1736) (c. 1664–1736), MP for Bishop's Castle, 1722–1727
- Sir William Williams, 2nd Baronet, of Clapton (c. 1730–1761), MP for New Shoreham. 1758–1751
- William Williams (signer) (1731–1811), U.S. Continental Congressman; signer of the Declaration of Independence for Connecticut.
- William Williams (politician) (1788–1865), Welsh businessman based in London, Radical MP 1835–1847 and 1850–1865
- William Williams (New York) (1815–1876), US Representative from New York
- William Williams (Indiana) (1821–1896), US Representative from Indiana
- William B. Williams (politician) (1826–1905), US Representative from Michigan
- William E. Williams (1857–1921), U.S. Representative from Illinois
- William R. Williams (1884–1972), US Representative from New York
- William Hume-Williams (1863–1947), Conservative Party politician in the United Kingdom
- Sir Thomas Williams (UK politician) (1915–1986), British Member of Parliament for Warrington
Religious figures
Others
- Billy Dee Williams, American actor
- William Williams (doctor) (1855/6–1911), Welsh doctor and writer on sanitation issues
- William Williams (footballer), Welsh footballer of the 1920s
- William Williams (murderer) (1877–1906), last person executed by Minnesota
- William Williams (rugby player) (1866-1945), Wales international rugby union player
- William Henry Williams (1852–1941), English-born Australian Headmaster and professor
- William Henry Williams (rugby player) (1873-1936), Wales international rugby union player
- William S. Williams (1787–1849), American mountain man
- William B. Williams (DJ) (1923–1986), disk jockey on New York City radio station WNEW
- William W. Williams, author of the Encyclopedia of Pseudoscience
- John Williams (footballer born 1960), English soccer player (born William John Williams)
Fictional characters
- "Clean Willy" Williams, fictional character in Michael Crichton's novel The Great Train Robbery
- Williams Williams, in the Simpsons episode "Bart the Murderer", is the real name of the character Fat Tony
- William W. Williams, the full name of Willy from the gangrene gang in The Power Puff Girls
See also
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