William Bayly may refer to:
- William Bayly (astronomer) (1737–1810), English astronomer
- William Bayly (barrister) (1540–1612), English barrister and politician
- William Alfred Bayly (1906–1934), New Zealand farmer and convicted murderer
- W. R. Bayly (William Reynolds Bayly, 1867–1937), educator in South Australia
This disambiguation page lists articles about people with the same name.
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