John N. Irwin (1847–1905), American politician, governor of Idaho Territory, 1883–1884, and Arizona Territory, 1890–1892
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John N. Irwin, II (1913–2000), American Deputy Secretary of State and Ambassador to France (1973-1974)
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John Keith Irwin (1930-2010), American sociologist known for his work on subcultures and on the prison system.
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