• Jeffrey O'Neill (Guiding Light), a fictional character of the soap opera Guiding Light
• Jeff O'Neill
  Jeff O'Neill
  Jeffrey O'Neill is a Canadian former professional ice hockey winger in the National Hockey League . During his career, he played for the Hartford Whalers/Carolina Hurricanes and the Toronto Maple Leafs...
  
   (born 1976), Canadian ice hockey player

See also

• Jeffrey Hamet O'Neal
  Jeffrey Hamet O'Neal
  Jeffrey Hamet O'Neal , was an Irish miniature-painter. He practised for many years in London as a miniature-painter, and exhibited occasionally with the Incorporated Society of Artists, of which he was a fellow, being one of the artists who signed the declaration roll in 1766...
  
  , portrait painter
• O'Neill (surname)
  O'Neill (surname)
  The O'Neill dynasty is a group of families that have held prominent positions and titles throughout European history. The O'Neills take their name from Niall Glúndub, an early 10th century High King of Ireland from the Cenél nEógain...