title: John Duff (disambiguation)
text: # 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
  