John Mahon
John Mahon may refer to:
- John Mahon (baseball), baseball owner and politician
- John Mahon (composer), musician and composer
- John Mahon (Australian footballer), Australian rules footballer
- John Mahon (Irish footballer), Irish footballer
- John Mahon (politician), British communist political activist
- John Mahon (actor), American film, stage and television actor
- John Mahon, drummer and vocalist with the Elton John Band
- John K. Mahon, historian
- John Lincoln Mahon, British socialist activist
- John Christopher Mahon, Irish-born priest in Kenya
- Sir John Denis Mahon, British scholar