John Hack may refer to:
- John Hack (Medal of Honor) (1842–1933), soldier in the Union Army in the American Civil War
- John Hack (speedway rider) (born 1959), British motorcycle speedway rider
- John Tilton Hack (1913–1991), American geologist
- John Barton Hack (1805–1884), early settler in South Australia
This disambiguation page lists articles about people with the same name.
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