Gary, or Garry, O'Neill, or O'Neil, may refer to:
- Gary O'Neil (born 1983), English footballer and manager
- Gary O'Neil (Neighbours), a fictional character on Australian soap Neighbours
- Garry O'Neill (born 1974), Australian martial artist
- Gary O'Neill (born 1982), Irish footballer who played for Shelbourne in the 2000s
- Gary O'Neill (born 1995), Irish footballer who, as of 2022, plays for Shamrock Rovers
See also
- Gary Neil, Scottish footballer
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