John O'Brien (basketball), member of the Basketball Hall of Fame. John O'Brien (chancellor), the Lord Chancellor of Ireland from 1913 to 1918. John O'Brien (circus owner), owner of the Tom King Excelsior Circus from 1864 to 1865. John O'Brien (novelist), an American novelist, the writer of Leaving Las Vegas. John O'Brien (soccer), an American soccer player who plays for the United States national team. John O'Brien (baseball player), a Canadian Major League Baseball player. John O'Brien (musician), of the rock band Super 8. John O'Brien (politician), a New Zealand political candidate and party leader. John O'Brien (UK politician), a far right figure and one time leader of the British National Front.