John Casey

John Casey may refer to:
 * John Casey (academic) (born 1939), British academic and writer for The Daily Telegraph
 * John Casey (Chuck), fictional character portrayed by Adam Baldwin on the television show Chuck
 * John Casey (commentator) (born 1964), Australian journalist and sports broadcaster
 * John Casey (footballer) (fl. 1935–1941), Dumbarton FC player
 * John Casey (mathematician) (1820–1891), Irish geometer
 * John Casey (politician) (1823–1893), Newfoundland politician
 * John Casey (novelist) (born 1939), American novelist and translator
 * John Casey (rugby league), rugby league footballer of the 1920s and 1930s
 * John J. Casey (1875–1929), Democratic member of the U.S. House of Representatives from Pennsylvania
 * John Casey (climate change author), American author
 * John Casey (Australian convict) (died 1882), Irish rebel transported to Australia in 1826
 * John Keegan Casey (1846–1870), Irish poet, orator and republican
 * John Sears Casey (born 1930), member of the Alabama House of Representatives
 * Captain John C. Casey (19th century), who gave his name to Fort Casey in Florida
 * Jack Casey (John Casey, born 1935), member of the New Jersey General Assembly