William Eaton or Bill Eaton may refer to:
- William Eaton (soldier) (1764–1811), United States Army soldier during the Barbary Wars
- William A. Eaton, U.S. diplomat
- William J. Eaton (1930–2005), American journalist
- William W. Eaton (epidemiologist), eminent epidemiologist and psychiatrist
- William W. Eaton (1816–1898), politician from Connecticut
- William R. Eaton (1877–1942), U.S. Representative from Colorado
- Bill Eaton (politician), Australian politician in Queensland
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