John Cronin may refer to:
John Cronin (horticulturist), director of the Royal Botanic Gardens, Melbourne,
John Cronin (New Zealand), politician, currently the chairperson of the Bay of Plenty's regional council,
John Desmond Cronin, British politician,
John Cronin (convict), repeat-offense Scottish convict who become the first convict to be tracked by satellite in the UK,
John Francis Cronin, priest, author of Communism: a World Menace,
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