William Small (1734–1775) was a professor of natural philosophy, College of William and Mary in Virginia.

William Small may also refer to:

• William Small (Wisconsin politician) (1824–1900), Scottish-born Wisconsin politician
• William Small (artist) (1843–1929), Scottish artist
• William Small (basketball), American basketball coach
• William Small (Scottish politician) (1909–1978), Scottish Labour Party politician
• William Small (trade unionist) (1845–1903), Scottish trade unionist
• William B. Small (trade unionist) (1872–1944), his son, Scottish trade unionist
• William B. Small (politician) (1817–1878), U.S. Representative from New Hampshire
• William N. Small (1927–2016), U.S. Navy admiral
• William J. Small (1926–2020), American television executive

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