John Cavanagh may refer to:
- John Cavanagh (archer) (born 1956), British Paralympian.
- John Cavanagh (designer) (1914–2003), London-based Irish fashion designer
- John Cavanagh (economist), Director of the Institute for Policy Studies in Washington DC
- John Cavanagh (fives player) (died 1819), Irish sportsman
- John Cavanagh (hatter) (1864–1957), New York hatter, mayor of Norwalk, Connecticut