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) (fl.1300s), Mayor and MP for London, father-in-law of William Pecche
- John Hadley (philosopher) (born 1966), Australian ethicist
- John V. Hadley (c. 1839–1842–1915), Justice of the Indiana Supreme Court
Topics referred to by the same termThis disambiguation page lists articles about people with the same name. If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: