Nadège Beausson-Diagne (born 18 June 1972 in Paris) is a French actress, singer and columnist. She is mainly known for having played the police chief Sara Douala in the television series Plus belle la vie. She also appeared in successful films such as Podium by Yann Moix and Nothing to Declare [Rien à déclarer] by Dany Boon.

Beausson-Diagne made her first film appearance in 2004, playing one of Benoit Poelvooirde’s four “Bernadettes” in Podium. She continued acting, appearing in various feature films such as Agathe Cléry directed by Valérie Lemercier, with whom she would later work in Marie-Francine, and in Nothing to Declare by Dany Boon, who had previously directed her in Bienvenue chez les Ch'tis.