William Hardy
William Hardy may refer to:
- Billy Hardy , English bantamweight and featherweight boxer
- Billy Hardy , English footballer
- W. G. Hardy, Canadian professor, writer, ice hockey administrator
- William Hardy , American actor and theatre director
- William Hardy , British archivist and Deputy Keeper of the Public Record Office
- William Hardy , member of the New South Wales Legislative Council
- William Bate Hardy, British biologist
- William H. Hardy, American founder of Hattiesburg
- William Henry Hardy, Democratic politician
- Willie Hardy, Democratic politician
- William John Hardy, English archivist and antiquarian
- William Le Hardy, English archivist
- Will Hardy, American National Basketball Association Coach