Porgy and Bess is a 1959 American musical drama film directed by Otto Preminger, and starring Sidney Poitier and Dorothy Dandridge in the titular roles. It is based on the 1935 opera Porgy and Bess by George Gershwin, DuBose Heyward and Ira Gershwin, in turn based on Heyward's 1925 novel Porgy, as well as Heyward's subsequent 1927 non-musical stage adaptation, co-written with his wife Dorothy. The film's screenplay, which turned the operatic recitatives into spoken dialogue, was very closely based on the opera and was written by N. Richard Nash. In 2011, the film was chosen for inclusion in the National Film Registry of the Library of Congress.