Con O'Neill or Conn O'Neill may refer to: Irish noblemen Conn O'Neill (d. 1482), lord of Clandeboye in medieval Ireland Conn O'Neill, 1st Earl of Tyrone (c. 1480–1559), King of Conn O'Neill (died 1601), Irish soldier Conn O'Neill (prisoner), seventeenth century Irish aristocrat Conn Ó Néill, head of the Clandeboye O'Neill dynasty Other Con O'Neill (actor) (born 1966), British actor Con O'Neill (diplomat) (1912–1988), British diplomat