'O'Neill' (also spelled 'O'Neil', 'O'Neal') may refer to:
In 'places':
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O'Neill, Nebraska, a US city
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O'Neil, Florida, a US town
In 'business':
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O'Neill (brand), a wetsuit and surf clothing manufacturer
In 'education':
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O'Neill Collegiate and Vocational Institute, a school in Oshawa, Ontario
People with the surname 'O'Neill':
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Eugene O'Neill, the Nobel-prize winning American playwright
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Chelsea O'Neill, that awesome girl from Burnie
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O'Neill (surname)
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Baron O'Neill, a title in the Peerage of the United Kingdom
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Earl O'Neill, a title in the Peerage of Ireland
★ P. O'Neill, a
pseudonym used in statements of the Provisional Irish Republican Army
See also
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O'Neill class battleship, fictional spacecraft in the television show Stargate SG-1
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O'Neill cylinder, a space habitat design
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O'Neill Hall (University of Notre Dame), men's residence hall at the University of Notre Dame in Notre Dame, Indiana
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O’Neill House Office Building, former US Congressional Office Building in Washington D.C.
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Eugene O'Neill Theatre, a Broadway Theatre
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Eugene O'Neill National Historic Site, former home of Eugene O'Neill
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Sandler O'Neill and Partners, New York City-based investment banking firm that lost 67 employees in the 9/11-attacks
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Tip O'Neill Award, Canadian Baseball award
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O'Neil's, a former US department store chain based in Akron, Ohio
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O'Neills, an Irish manufacturer of sportswear