title: William Cassidy (disambiguation)
text: # William Cassidy (disambiguation)
  
  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
  