John Moriarty may refer to:
- John Moriarty (conductor) (born 1930), American conductor and stage director
- John Moriarty (writer) (1938–2007), Irish writer and philosopher
- John Kundereri Moriarty (born 1938), Australian football (soccer) player and artist
- John Moriarty (Attorney General) (1855–1915), Irish lawyer and judge
- Jack Moriarty (1901–1980), Australian rules player
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