Flora Rheta Schreiber (April 24, 1918 – November 3, 1988) was an American journalist and the author of the 1973 bestseller Sybil. For many years, she was also an English instructor at John Jay College of Criminal Justice. Schreiber's papers are housed in the Special Collections unit at Lloyd Sealy Library of John Jay College. The collection is a comprehensive documentation of her life and career.