Cecil de Cardonnel, 2nd Baroness Dynevor (July 1735 – 14 March 1793) was a Welsh peeress. She was the daughter of William Talbot, 1st Earl Talbot. Her mother was the daughter and heir of , British Secretary of War. Under the special remainder in the creation of the barony for her father, she and her heirs male were entitled to inherit the Barony of Dynevor. He father was also the 1st Earl Talbot (a title that became extinct on his death) and 2nd Baron Talbot of Hensol. That title was inherited by Lady Dynevor's cousin, John Chetwynd-Talbot.