John O'Callaghan
John O'Callaghan may refer to:
- John O'Callaghan (Medal of Honor) (1850–1899), American soldier and Medal of Honor recipient
- John O'Callaghan (politician) (died 1913), secretary of the United Irish League
- John O'Callaghan (musician), Irish musician and DJ
- Liam McCarthy and John D. O'Callaghan, BT Young Scientists of the Year and EU Young Scientists of the Year, 2009
- John Cornelius O'Callaghan (writer) (1805–1883), Irish historian and writer
- John Cornelius O'Callaghan, vocalist and guitarist of The Maine
See also
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