William Barnett may refer to:
William Barnett (engineer) (1802–1865), British engineer William Barnett (Georgia politician) (1761–1832), American politician and soldier William Barnett (Cambridge University cricketer) (1830–1869), English cricketer William Barnett (MCC cricketer) (fl. 1837), English cricketer William Barnett, former mayor of Cadillac, Michigan William Barnett, fictional character on That '70s Show William Barnett, political candidate in Akaroa (New Zealand electorate) William Barnett, squatter of Bendigo in Australia William A. Barnett (born 1941), American economist William P. Barnett (born 1958), American organizational theorist William O. Barrnett (born c. 1946), American academic administrator, president of San Francisco Art Institute (1987–1994) William O. Barnett, American doctor who developed the Barnett continent intestinal reservoir procedure Will Barnet (1911–2012), American painter Bill Barnett (born 1956), American football player