John Guest may refer to:
People
John Guest (judge) (died 1707), Chief Justice of the Supreme Court of Pennsylvania 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