John O'Hara is the name of a number of people:
- John O'Hara (1905–1970), American writer of Appointment in Samarra, Butterfield 8, and many short stories
- John O'Hara (Brooklyn politician), a sometime candidate for public office
- John O'Hara (Racing driver), a driver for A1 Team Ireland in the A1 Grand Prix
- John Francis O'Hara, an American archbishop and cardinal
- John O'Hara (actor), an American actor
- John O'Hara (DJ), a presenter on Belfast's U105 radio station
- John O'Hara (soccer), Irish professional soccer player
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