William Barr (born 1950) is an American lawyer and government official.
William Barr may also refer to:
- William G. Barr (1920–1987), Illinois state representative and businessman
- William Barr (historian) (born 1940), Scottish historian at the University of Calgary, Canada
- William Barr (artist) (1867–1933), Scottish / Californian artist
- Billy Barr (footballer) (born 1969), English footballer and coach
- Billy Barr (naturalist), famous for collecting 40 years of climate change data
This disambiguation page lists articles about people with the same name.
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