William Bayly

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