William Barnett
William Barnett may refer to:
- William Barnett (engineer), British engineer
- William Barnett (Georgia politician), American politician and soldier
- William Barnett (Cambridge University cricketer), English cricketer
- William Barnett (MCC cricketer), 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, American economist
- William P. Barnett, American organizational theorist
- William O. Barrnett, American academic administrator, president of San Francisco Art Institute
- William O. Barnett, American doctor who developed the Barnett continent intestinal reservoir procedure
- Will Barnet, American painter
- Bill Barnett, American football player