John O'Neal(l) may refer to:
- John O'Neal (Medal of Honor) (born 1841), U.S. sailor who was awarded the Medal of Honor
 - John O'Neal (politician) (active since 2010), American politician in West Virginia
 - John H. O'Neall (1838–1907), American politician from Indiana
 - John Belton O'Neall, judge who served on the precursor to the South Carolina Supreme Court
 - Johnny O'Neal (born 1956), American pianist
 
See also
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