- William Hamilton, 2nd Duke Of Hamilton (1616-1651), Scottish nobleman
- William Hamilton (surgeon) (died 1717), Surgeon of the British East India Company
- William Hamilton (educator) (?-1730?), Principal of the University of Edinburgh
- William Hamilton (poet) (1665-1751), Scottish poet
- William Hamilton (Jacobite Poet) (1704-1754), Scottish poet associated with the Jacobite movement
- Sir William Hamilton (diplomat) (1730-1803), Scottish diplomat and husband of Emma Hamilton
- William Hamilton (painter) (1751-1801), English painter
- William Richard Hamilton (1777-1859), English antiquarian and traveller
- William Hamilton (botanist) (1783-1856)
- Sir William Hamilton, 9th Baronet (1788-1856), the Scottish metaphysician
- Sir William Rowan Hamilton (1805-1865), Irish mathematician
- William Hamilton (tennis Player) , tennis player, winner of the 1890 Wimbledon championships
- William Hamilton, an Irishman who attacked Queen Victoria in 1849
- Willie Hamilton (1917-2000), anti-monarchist British MP
- Willie Hamilton (1938-1976), Scottish footballer
- W. D. Hamilton (1936-2000), British biologist
- Billy Hamilton (footballer) (born 1957), Northern Irish footballer
- William Hamilton (cricketer) (1859-1914), Irish cricketer
- William Hamilton , (d. 1307) Lord Chancellor of England
- William Hamilton (Woodlands) (1745-1813), Horticulturist, landscape designer, developer of "Woodlands" in Philadelphia
- William Hamilton (abolitionist) (1773-1836) Black abolitionist, carpenter, and journalist. Claimed to be an illegitimate son of Alexander Hamilton.
- Colonel William Sutherland Hamilton , (1789-1867?) plantation owner, of Laurel Hill, Louisiana.
- William Thomas Hamilton (1820-1888), Governor of Maryland (1880-1884
- William Hamilton (trapper) (1822-1908), American trapper, "Wildcat Bill"
- Billy Hamilton (baseball Player) (1866-1940), American Major League Baseball player
- William F. Hamilton (born 1884), 1908 Olympic gold medalist
- William Hamilton (film Editor) (1893-1942), film editor
- William Hamilton (lumber Baron) (-1922), lumber merchant and political figure in Upper Canada. .
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