William Jack is the name of:
- William Jack (athlete) (born 1930), British Olympic sprinter
- William Jack (Australian explorer) (died 1910), founder of Herberton, Queensland
- William Jack (Australian politician) (1892–1982)
- William Jack (botanist) (1795–1822), of Scotland
- William Jack (mathematician) (1834–1924), from Scotland
- William Jack (U.S. politician) (1788–1852), member of the U.S. House of Representatives
- William Brydone Jack (1817–1886), Canadian mathematician and astronomer
- William Houston Jack (1806–1844), Republic of Texas congressman and soldier
This disambiguation page lists articles about people with the same name.
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