John O'Farrell

John O'Farrell may refer to:


 * John O'Farrell (author) (born 1962), British author, broadcaster and politician
 * John O'Farrell (politician) (1826–1892), Canadian politician
 * John O'Farrell (venture capitalist), Irish American venture capitalist
 * John A. O'Farrell (1823–1900), Irish American adventurer, miner