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) (1939–2025), 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 (1930–2022), member of the Alabama House of Representatives
• Captain John C. Casey (1809–1856), who gave his name to Fort Casey in Florida
• Jack Casey (John Casey, 1935–2019), member of the New Jersey General Assembly