Colin Higgins later adapted the story into a stage play. The original Broadway production, starring Janet Gaynor as Maude and Keith McDermott as Harold, closed after four performances in February 1980.
A French adaptation for television, translated and written by Jean-Claude Carrière, appeared in 1978. It was also adapted for the stage by the Compagnie Viola Léger in Moncton, New Brunswick, starring Roy Dupuis.
Unproduced sequel and prequel
Higgins expressed interest in 1978 about both a sequel and prequel to Harold and Maude. The sequel, Harold's Story, would have Cort portray Harold's life after Maude. Higgins also imagined a prequel showing Maude's life before Harold, Grover and Maude had Maude learning how to steal cars from Grover Muldoon, the character portrayed by Richard Pryor in Higgins' 1976 film Silver Streak. Higgins wanted Gordon and Pryor to reprise their respective roles.