John J. or John Joseph O'Neill may refer to:

• John Joseph O'Neill (journalist) (1889–1953), winner of the Pulitzer Prize for Reporting
• John J. O'Neill (American politician) (John Joseph O'Neill, 1846–1898), Missouri congressman
• John Joseph O'Neill (British politician) (1888–1953), Liberal Party politician in England, member of parliament for Lancaster 1923–1924
• John Johnston O'Neill (1886–1966), Canadian geologist and academic
• John O'Neill (guitarist) (John Joseph O'Neill, born 1957), Northern Irish guitarist of rock band The Undertones
• John O'Neill (footballer, born 1974) (John Joseph O'Neill), former Scottish football player with Queen of the South and former manager of Stirling Albion
• Jonjo O'Neill (jockey) (John Joseph O'Neill, born 1952), Irish racehorse trainer and jockey
• Jack O'Neill (baseball) (John Joseph O'Neill, 1873–1935), catcher in Major League Baseball

• John O'Neill (disambiguation)

Topics referred to by the same term

This disambiguation page lists articles about people with the same name.
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