John Duff (disambiguation)
# John Duff (disambiguation)

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 (UP), president of Union Pacific Railroad (1873–1874)
* 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
