John Cassidy

John Cassidy may refer to:

• John Cassidy (artist) (1860–1939), Irish sculptor and painter
• John Cassidy (baseball) (1855–1891), American baseball player
• John Cassidy (basketball) (born 1947), Canadian Olympic basketball player
• John Cassidy (journalist) (born 1963), business journalist and published author
• John Cassidy (magician) (born 1967), American magician and balloon artist
• John Cassidy (author), American author and publishing executive
• John Cassidy (chancellor), Australian businessman and former university chancellor
• John Cassidy (seismologist) (born 1959), Canadian seismologist
• John Cassidy (speed skater) (born 1952), Canadian Olympic speed skater
• Jack Cassidy (1927–1976), American actor
• John Edward Cassidy (1896–1984), American lawyer; Illinois Attorney General
• John E. Cassidy Jr (1924—2003), member of the Illinois House of Representatives.
• John F. Cassidy, Vice Chairman of the board and former Chief Executive Officer of Cincinnati Bell Inc.
• John Joe Cassidy (died 1995), Gaelic football player for Cavan
• John P. Cassidy (1912–?), Los Angeles City Council member, 1962–1967