William Cann
William Cann may refer to:
- William Derwood Cann Jr., college professor, manufacturing executive, and interim mayor of Monroe, Louisiana
- Billy Cann, rugby league player
- Billy Cann (politician) from 2011 Prince Edward Island general election
- William Cann of the Cann baronets
- 1974 assassination of William Cann, police chief of Union City, California