William Ashby

William Ashby may refer to:
 * William Ashby (cricketer) (1786–1847), English cricketer
 * W. Ross Ashby (1903–1972), English psychiatrist and cyberneticist
 * William Ashby (died 1543), MP for Leicestershire
 * William Ashby (died 1593), MP for Chichester and Grantham, and ambassador in Scotland
 * William Ashby, character in The Witch of Blackbird Pond
 * Bill Ashby, coach at Maine Sting
 * William Joseph Ashby (1885–1953), Irish rugby union player