William Cassidy may refer to:
- Bill Cassidy (born 1957), American politician
- William A. Cassidy, American geologist
- Bill Cassidy (footballer, born 1917) (1917–1962), English footballer with Gateshead
- Bill Cassidy (footballer, born 1940) (1940–1995), Scottish footballer with Rotherham United, Brighton & Hove Albion, Detroit Cougars and others
- William F. Cassidy (1908–2002), American military commander
This disambiguation page lists articles about people with the same name.
If an internal link led you here, you may wish to change the link to point directly to the intended article.
If an internal link led you here, you may wish to change the link to point directly to the intended article.