The Drama Desk Award for Outstanding Book of a Musical is an annual award presented by Drama Desk in recognition of achievements in the theatre among Broadway, Off Broadway and Off-Off Broadway productions. For two years, in addition to the award for Outstanding Book, an award was presented to the writers of the Most Promising Book. Recipients of this honor were Melvin Van Peebles for Ain't Supposed to Die a Natural Death in 1972 and Ron House and Diz White for El Grande de Coco-Cola in 1973.