title: John Thornycroft
text: John Thornycroft may refer to:
  Sir John Thornycroft, 1st Baronet (1659–1725), English barrister-at-law
  John Edward Thornycroft (1872–1960), British civil engineer
  John Isaac Thornycroft (1843–1928), British shipbuilder
  John I. Thornycroft & Company Limited, the shipbuilding company named after him