John Cassidy may refer to:
- John Cassidy (artist) (1860–1939), Irish sculptor and painter
- John Cassidy (baseball) (1855–1891), American baseball 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 (university chancellor), Australian businessman and former university chancellor
- John Cassidy (seismologist) (born 1959), Canadian seismologist
- Jack Cassidy (1927–1976), American actor
- John F. Cassidy, President and Chief Executive Officer of Cincinnati Bell Inc.
- John Joe Cassidy (died 1995), Gaelic football player for Cavan
- John P. Cassidy, Los Angeles City Council member, 1962–1967
Famous quotes containing the word cassidy:
“Seeing to it that a youngster grows up believing not just in the here and now but also in the grand maybes of life guarantees that some small yet crucial part of him remains forever a child.”
—Anne Cassidy (20th century)