John Cadman may refer to:
- John Cadman (convict), transported to Australia in 1797
- John Cadman, 1st Baron Cadman, British mining engineer
- John Cadman (sportsman) (1934-), English cricketer and field hockey player
- Baron Cadman is a title in the Peerage of the United Kingdom
This disambiguation page lists articles about people with the same name.
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