John Hadley (disambiguation)
John Hadley (1682–1744) was a British mathematician and inventor of the octant.
John Hadley may also refer to:
- John Hadley (chemist) (1731–1764), British chemist and physician
- John Hadley (Mayor of London), Mayor and MP for London, father-in-law of William Pecche
- John Hadley (philosopher) (born 1966), Australian ethicist
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