John Guest may refer to:
People
- John Guest (judge) (died 1707), Chief Justice of the Supreme Court of Pennsylvania
- John Guest (1722–1785), British businessman and patriarch of the Guest family
- John Josiah Guest (1785–1852), British industrialist
- John Guest (naval officer) (1822–1879), United States Navy officer
- John Guest (politician) (1867–1931), British Labour Party Member of Parliament
- Jack Guest (1906–1972), Canadian rowing Olympic medal winner
- John Rodney Guest (born 1935), British microbiologist
- John Guest (geologist) (1938–2012), British volcanologist and planetary scientist
Other
- John Guest (company), British manufacturer of push-in fittings, pipe and plastic plumbing systems
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