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
This disambiguation page lists articles about people with the same name.
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