Sheridan A. Morley (5 December 1941 − 16 February 2007) was an English author, biographer, critic and broadcaster. He was the official biographer of Sir John Gielgud and wrote biographies of many other theatrical figures he had known, including Noël Coward.
Morley was the eldest son of actor Robert Morley and grandson, via his mother Joan Buckmaster, of the actress Dame Gladys Cooper.