William Cann

William Cann may refer to:
 * William Derwood Cann Jr. (1919–2010), college professor, manufacturing executive, and interim mayor of Monroe, Louisiana
 * Billy Cann (1882–1958), 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