William Denny
William Denny may refer to:
- William Denny (MP), English lawyer and politician
- William Denny, deputy governor of the Province of Pennsylvania, 1756–1759
- William Denny Jr., American politician in the Mississippi House of Representatives
- William Denny and Brothers, British shipbuilder based in Dumbarton, Scotland
- William Alexander Denny or Bill Denny (medical researcher), New Zealand chemist
- William F. Denny, American vaudeville performer and pioneer recording artist
- William H. P. Denny, American newspaper editor and publisher and politician in Ohio
- William Joseph Denny or Bill Denny, South Australian politician