The César Award for Best Writing (French: César du meilleur scénario, dialogues ou adaptation (1976-1982); César du meilleur scénario original ou adaptation (1986-2005)) is a former award given by the Académie des Arts et Techniques du Cinéma from 1976 to 2005. It was split into César Award for Best Original Screenplay and César Award for Best Adaptation in 2006.
The César Award for Best Adaptation and the César Award for Best Original Screenplay were awarded from 1983 to 1985.