Con O'Neill or Conn O'Neill may refer to:
- Conn O'Neill (d. 1482), lord of Clandeboye in medieval Ireland
- Conn O'Neill, 1st Earl of Tyrone (c. 1480–1559), King of Tír Eógain
- Conn O'Neill (prisoner), seventeenth century Irish aristocrat
- Con O'Neill (actor) (born 1966), British actor
- Con O'Neill (diplomat) (1912–1988), British diplomat
This disambiguation page lists articles about people with the same name.
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