William Hayes
William Hayes may refer to:
In politics
- William Hayes (Irish politician), Irish Sinn Féin politician
- William Hayes (Canadian politician), member of the Legislative Assembly of Alberta
- William P. Hayes, American lawyer and mayor of Springfield, Massachusetts
In sport
- William Hayes (American football), American football player
- William Hayes (Australian cricketer), Australian cricketer
- William Hayes (New Zealand cricketer), New Zealand cricketer
- William Hayes (diver), Canadian Olympic diver
- William Hayes (rugby league), rugby league footballer of the 1930s and 1940s
- William Hayes (wrestler), British wrestler
- Willie Hayes (basketball), American college basketball head coach
- Willie Hayes, Irish footballer
- Will Hayes (Australian footballer), Australian footballer
- William Hayes (Australian footballer), Australian footballer
- William Hayes (sprinter), American sprinter, 3rd in the 220 yards at the 1922 USA Outdoor Track and Field Championships
- Bill Hayes (footballer, born 1919), English footballer, see List of Oldham Athletic A.F.C. players
Other people
- William Hayes (composer), organist, conductor, writer
- William Hayes (geneticist), Irish-born microbiologist and geneticist
- William Hayes (pastoralist), Australian pastoralist
- William Hayes (photographer), Victorian photographer in York, England
- William C. Hayes, American Egyptologist
- William Prine Hayes, Canadian commodore and educator
- William Q. Hayes, U.S. federal judge
- William Hayes (academic), president of St John's College, Oxford
- Billy Hayes (writer), American writer
- Bully Hayes, American ship's captain and trader
- J. William Hayes, American entertainment lawyer
- Harm (comics), a supervillain from DC Comics