William Ashby

• William Ashby (cricketer), English cricketer
• W. Ross Ashby, 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, Irish rugby union player