Diana Cooper, Viscountess Norwich (née Lady Diana Manners; 29 August 1892 " 16 June 1986), was a prominent social figure in London and Paris, widely acknowledged as the beauty of the century.
The young Cooper moved in a celebrated group of intellectuals, most of them killed in World War I. She married one of the only survivors, Duff Cooper, later Ambassador to France. After his death, she wrote three volumes of memoirs which reveal much about 20th-century upper-class life.