John Duff (1895–1958) was a Canadian race car driver.
John Duff may also refer to:
- John Duff (counterfeiter) (1759–1799), American counterfeiter, hunter, and scout
- John Duff (singer) (born 1988), American pop singer
- John B. Duff (born 1931), former commissioner of The Chicago Public Library
- John Finlay Duff (1799–1868), captain of ship Africaine and businessman in South Australia
- John Wight Duff (1866–1944), Scottish classicist and academic
This disambiguation page lists articles about people with the same name.
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