Con O'Neill

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