William Jack

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